# Parts¶

The following classes allow interaction with a vessels individual parts.

## Parts¶

krpc_SpaceCenter_Parts_t

Instances of this class are used to interact with the parts of a vessel. An instance can be obtained by calling krpc_SpaceCenter_Vessel_Parts().

krpc_error_t krpc_SpaceCenter_Parts_All(krpc_connection_t connection, krpc_list_object_t * result)

A list of all of the vessels parts.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Parts_Root(krpc_connection_t connection, krpc_SpaceCenter_Part_t * result)

The vessels root part.

Game Scenes: All

Note

See the discussion on Trees of Parts.

krpc_error_t krpc_SpaceCenter_Parts_Controlling(krpc_connection_t connection, krpc_SpaceCenter_Part_t * result)
void krpc_SpaceCenter_Parts_set_Controlling(krpc_SpaceCenter_Part_t value)

The part from which the vessel is controlled.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Parts_WithName(krpc_connection_t connection, krpc_list_object_t * result, const char * name)

A list of parts whose krpc_SpaceCenter_Part_Name() is name.

Parameters: All
krpc_error_t krpc_SpaceCenter_Parts_WithTitle(krpc_connection_t connection, krpc_list_object_t * result, const char * title)

A list of all parts whose krpc_SpaceCenter_Part_Title() is title.

Parameters: All
krpc_error_t krpc_SpaceCenter_Parts_WithTag(krpc_connection_t connection, krpc_list_object_t * result, const char * tag)

A list of all parts whose krpc_SpaceCenter_Part_Tag() is tag.

Parameters: All
krpc_error_t krpc_SpaceCenter_Parts_WithModule(krpc_connection_t connection, krpc_list_object_t * result, const char * moduleName)

A list of all parts that contain a krpc_SpaceCenter_Module_t whose krpc_SpaceCenter_Module_Name() is moduleName.

Parameters: All
krpc_error_t krpc_SpaceCenter_Parts_InStage(krpc_connection_t connection, krpc_list_object_t * result, int32_t stage)

A list of all parts that are activated in the given stage.

Parameters: All

Note

See the discussion on Staging.

krpc_error_t krpc_SpaceCenter_Parts_InDecoupleStage(krpc_connection_t connection, krpc_list_object_t * result, int32_t stage)

A list of all parts that are decoupled in the given stage.

Parameters: All

Note

See the discussion on Staging.

krpc_error_t krpc_SpaceCenter_Parts_ModulesWithName(krpc_connection_t connection, krpc_list_object_t * result, const char * moduleName)

A list of modules (combined across all parts in the vessel) whose krpc_SpaceCenter_Module_Name() is moduleName.

Parameters: All
krpc_error_t krpc_SpaceCenter_Parts_Antennas(krpc_connection_t connection, krpc_list_object_t * result)

A list of all antennas in the vessel.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Parts_CargoBays(krpc_connection_t connection, krpc_list_object_t * result)

A list of all cargo bays in the vessel.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Parts_ControlSurfaces(krpc_connection_t connection, krpc_list_object_t * result)

A list of all control surfaces in the vessel.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Parts_Decouplers(krpc_connection_t connection, krpc_list_object_t * result)

A list of all decouplers in the vessel.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Parts_DockingPorts(krpc_connection_t connection, krpc_list_object_t * result)

A list of all docking ports in the vessel.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Parts_Engines(krpc_connection_t connection, krpc_list_object_t * result)

A list of all engines in the vessel.

Game Scenes: All

Note

This includes any part that generates thrust. This covers many different types of engine, including liquid fuel rockets, solid rocket boosters, jet engines and RCS thrusters.

krpc_error_t krpc_SpaceCenter_Parts_Experiments(krpc_connection_t connection, krpc_list_object_t * result)

A list of all science experiments in the vessel.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Parts_Fairings(krpc_connection_t connection, krpc_list_object_t * result)

A list of all fairings in the vessel.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Parts_Intakes(krpc_connection_t connection, krpc_list_object_t * result)

A list of all intakes in the vessel.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Parts_Legs(krpc_connection_t connection, krpc_list_object_t * result)

A list of all landing legs attached to the vessel.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Parts_LaunchClamps(krpc_connection_t connection, krpc_list_object_t * result)

A list of all launch clamps attached to the vessel.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Parts_Lights(krpc_connection_t connection, krpc_list_object_t * result)

A list of all lights in the vessel.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Parts_Parachutes(krpc_connection_t connection, krpc_list_object_t * result)

A list of all parachutes in the vessel.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Parts_Radiators(krpc_connection_t connection, krpc_list_object_t * result)

A list of all radiators in the vessel.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Parts_RCS(krpc_connection_t connection, krpc_list_object_t * result)

A list of all RCS blocks/thrusters in the vessel.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Parts_ReactionWheels(krpc_connection_t connection, krpc_list_object_t * result)

A list of all reaction wheels in the vessel.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Parts_ResourceConverters(krpc_connection_t connection, krpc_list_object_t * result)

A list of all resource converters in the vessel.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Parts_ResourceHarvesters(krpc_connection_t connection, krpc_list_object_t * result)

A list of all resource harvesters in the vessel.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Parts_Sensors(krpc_connection_t connection, krpc_list_object_t * result)

A list of all sensors in the vessel.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Parts_SolarPanels(krpc_connection_t connection, krpc_list_object_t * result)

A list of all solar panels in the vessel.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Parts_Wheels(krpc_connection_t connection, krpc_list_object_t * result)

A list of all wheels in the vessel.

Game Scenes: All

## Part¶

krpc_SpaceCenter_Part_t

Represents an individual part. Vessels are made up of multiple parts. Instances of this class can be obtained by several methods in krpc_SpaceCenter_Parts_t.

krpc_error_t krpc_SpaceCenter_Part_Name(krpc_connection_t connection, char * * result)

Internal name of the part, as used in part cfg files. For example “Mark1-2Pod”.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_Title(krpc_connection_t connection, char * * result)

Title of the part, as shown when the part is right clicked in-game. For example “Mk1-2 Command Pod”.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_Tag(krpc_connection_t connection, char * * result)
void krpc_SpaceCenter_Part_set_Tag(const char * value)

The name tag for the part. Can be set to a custom string using the in-game user interface.

Game Scenes: All

Note

This string is shared with kOS if it is installed.

krpc_error_t krpc_SpaceCenter_Part_Highlighted(krpc_connection_t connection, bool * result)
void krpc_SpaceCenter_Part_set_Highlighted(bool value)

Whether the part is highlighted.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_HighlightColor(krpc_connection_t connection, krpc_tuple_double_double_double_t * result)
void krpc_SpaceCenter_Part_set_HighlightColor(const krpc_tuple_double_double_double_t * value)

The color used to highlight the part, as an RGB triple.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_Cost(krpc_connection_t connection, double * result)

The cost of the part, in units of funds.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_Vessel(krpc_connection_t connection, krpc_SpaceCenter_Vessel_t * result)

The vessel that contains this part.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_Parent(krpc_connection_t connection, krpc_SpaceCenter_Part_t * result)

The parts parent. Returns nullptr if the part does not have a parent. This, in combination with krpc_SpaceCenter_Part_Children(), can be used to traverse the vessels parts tree.

Game Scenes: All

Note

See the discussion on Trees of Parts.

krpc_error_t krpc_SpaceCenter_Part_Children(krpc_connection_t connection, krpc_list_object_t * result)

The parts children. Returns an empty list if the part has no children. This, in combination with krpc_SpaceCenter_Part_Parent(), can be used to traverse the vessels parts tree.

Game Scenes: All

Note

See the discussion on Trees of Parts.

krpc_error_t krpc_SpaceCenter_Part_AxiallyAttached(krpc_connection_t connection, bool * result)

Whether the part is axially attached to its parent, i.e. on the top or bottom of its parent. If the part has no parent, returns false.

Game Scenes: All

Note

See the discussion on Attachment Modes.

krpc_error_t krpc_SpaceCenter_Part_RadiallyAttached(krpc_connection_t connection, bool * result)

Whether the part is radially attached to its parent, i.e. on the side of its parent. If the part has no parent, returns false.

Game Scenes: All

Note

See the discussion on Attachment Modes.

krpc_error_t krpc_SpaceCenter_Part_Stage(krpc_connection_t connection, int32_t * result)

The stage in which this part will be activated. Returns -1 if the part is not activated by staging.

Game Scenes: All

Note

See the discussion on Staging.

krpc_error_t krpc_SpaceCenter_Part_DecoupleStage(krpc_connection_t connection, int32_t * result)

The stage in which this part will be decoupled. Returns -1 if the part is never decoupled from the vessel.

Game Scenes: All

Note

See the discussion on Staging.

krpc_error_t krpc_SpaceCenter_Part_Massless(krpc_connection_t connection, bool * result)

Whether the part is massless.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_Mass(krpc_connection_t connection, double * result)

The current mass of the part, including resources it contains, in kilograms. Returns zero if the part is massless.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_DryMass(krpc_connection_t connection, double * result)

The mass of the part, not including any resources it contains, in kilograms. Returns zero if the part is massless.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_Shielded(krpc_connection_t connection, bool * result)

Whether the part is shielded from the exterior of the vessel, for example by a fairing.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_DynamicPressure(krpc_connection_t connection, float * result)

The dynamic pressure acting on the part, in Pascals.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_ImpactTolerance(krpc_connection_t connection, double * result)

The impact tolerance of the part, in meters per second.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_Temperature(krpc_connection_t connection, double * result)

Temperature of the part, in Kelvin.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_SkinTemperature(krpc_connection_t connection, double * result)

Temperature of the skin of the part, in Kelvin.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_MaxTemperature(krpc_connection_t connection, double * result)

Maximum temperature that the part can survive, in Kelvin.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_MaxSkinTemperature(krpc_connection_t connection, double * result)

Maximum temperature that the skin of the part can survive, in Kelvin.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_ThermalMass(krpc_connection_t connection, float * result)

A measure of how much energy it takes to increase the internal temperature of the part, in Joules per Kelvin.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_ThermalSkinMass(krpc_connection_t connection, float * result)

A measure of how much energy it takes to increase the skin temperature of the part, in Joules per Kelvin.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_ThermalResourceMass(krpc_connection_t connection, float * result)

A measure of how much energy it takes to increase the temperature of the resources contained in the part, in Joules per Kelvin.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_ThermalConductionFlux(krpc_connection_t connection, float * result)

The rate at which heat energy is conducting into or out of the part via contact with other parts. Measured in energy per unit time, or power, in Watts. A positive value means the part is gaining heat energy, and negative means it is losing heat energy.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_ThermalConvectionFlux(krpc_connection_t connection, float * result)

The rate at which heat energy is convecting into or out of the part from the surrounding atmosphere. Measured in energy per unit time, or power, in Watts. A positive value means the part is gaining heat energy, and negative means it is losing heat energy.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_ThermalRadiationFlux(krpc_connection_t connection, float * result)

The rate at which heat energy is radiating into or out of the part from the surrounding environment. Measured in energy per unit time, or power, in Watts. A positive value means the part is gaining heat energy, and negative means it is losing heat energy.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_ThermalInternalFlux(krpc_connection_t connection, float * result)

The rate at which heat energy is begin generated by the part. For example, some engines generate heat by combusting fuel. Measured in energy per unit time, or power, in Watts. A positive value means the part is gaining heat energy, and negative means it is losing heat energy.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_ThermalSkinToInternalFlux(krpc_connection_t connection, float * result)

The rate at which heat energy is transferring between the part’s skin and its internals. Measured in energy per unit time, or power, in Watts. A positive value means the part’s internals are gaining heat energy, and negative means its skin is gaining heat energy.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_Resources(krpc_connection_t connection, krpc_SpaceCenter_Resources_t * result)

A krpc_SpaceCenter_Resources_t object for the part.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_Crossfeed(krpc_connection_t connection, bool * result)

Whether this part is crossfeed capable.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_IsFuelLine(krpc_connection_t connection, bool * result)

Whether this part is a fuel line.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_FuelLinesFrom(krpc_connection_t connection, krpc_list_object_t * result)

The parts that are connected to this part via fuel lines, where the direction of the fuel line is into this part.

Game Scenes: All

Note

See the discussion on Fuel Lines.

krpc_error_t krpc_SpaceCenter_Part_FuelLinesTo(krpc_connection_t connection, krpc_list_object_t * result)

The parts that are connected to this part via fuel lines, where the direction of the fuel line is out of this part.

Game Scenes: All

Note

See the discussion on Fuel Lines.

krpc_error_t krpc_SpaceCenter_Part_Modules(krpc_connection_t connection, krpc_list_object_t * result)

The modules for this part.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_Antenna(krpc_connection_t connection, krpc_SpaceCenter_Antenna_t * result)

A krpc_SpaceCenter_Antenna_t if the part is an antenna, otherwise nullptr.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_CargoBay(krpc_connection_t connection, krpc_SpaceCenter_CargoBay_t * result)

A krpc_SpaceCenter_CargoBay_t if the part is a cargo bay, otherwise nullptr.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_ControlSurface(krpc_connection_t connection, krpc_SpaceCenter_ControlSurface_t * result)

A krpc_SpaceCenter_ControlSurface_t if the part is an aerodynamic control surface, otherwise nullptr.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_Decoupler(krpc_connection_t connection, krpc_SpaceCenter_Decoupler_t * result)

A krpc_SpaceCenter_Decoupler_t if the part is a decoupler, otherwise nullptr.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_DockingPort(krpc_connection_t connection, krpc_SpaceCenter_DockingPort_t * result)

A krpc_SpaceCenter_DockingPort_t if the part is a docking port, otherwise nullptr.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_Engine(krpc_connection_t connection, krpc_SpaceCenter_Engine_t * result)

An krpc_SpaceCenter_Engine_t if the part is an engine, otherwise nullptr.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_Experiment(krpc_connection_t connection, krpc_SpaceCenter_Experiment_t * result)

An krpc_SpaceCenter_Experiment_t if the part is a science experiment, otherwise nullptr.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_Fairing(krpc_connection_t connection, krpc_SpaceCenter_Fairing_t * result)

A krpc_SpaceCenter_Fairing_t if the part is a fairing, otherwise nullptr.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_Intake(krpc_connection_t connection, krpc_SpaceCenter_Intake_t * result)

An krpc_SpaceCenter_Intake_t if the part is an intake, otherwise nullptr.

Game Scenes: All

Note

This includes any part that generates thrust. This covers many different types of engine, including liquid fuel rockets, solid rocket boosters and jet engines. For RCS thrusters see krpc_SpaceCenter_RCS_t.

krpc_error_t krpc_SpaceCenter_Part_Leg(krpc_connection_t connection, krpc_SpaceCenter_Leg_t * result)

A krpc_SpaceCenter_Leg_t if the part is a landing leg, otherwise nullptr.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_LaunchClamp(krpc_connection_t connection, krpc_SpaceCenter_LaunchClamp_t * result)

A krpc_SpaceCenter_LaunchClamp_t if the part is a launch clamp, otherwise nullptr.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_Light(krpc_connection_t connection, krpc_SpaceCenter_Light_t * result)

A krpc_SpaceCenter_Light_t if the part is a light, otherwise nullptr.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_Parachute(krpc_connection_t connection, krpc_SpaceCenter_Parachute_t * result)

A krpc_SpaceCenter_Parachute_t if the part is a parachute, otherwise nullptr.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_Radiator(krpc_connection_t connection, krpc_SpaceCenter_Radiator_t * result)

A krpc_SpaceCenter_Radiator_t if the part is a radiator, otherwise nullptr.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_RCS(krpc_connection_t connection, krpc_SpaceCenter_RCS_t * result)

A krpc_SpaceCenter_RCS_t if the part is an RCS block/thruster, otherwise nullptr.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_ReactionWheel(krpc_connection_t connection, krpc_SpaceCenter_ReactionWheel_t * result)

A krpc_SpaceCenter_ReactionWheel_t if the part is a reaction wheel, otherwise nullptr.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_ResourceConverter(krpc_connection_t connection, krpc_SpaceCenter_ResourceConverter_t * result)

A krpc_SpaceCenter_ResourceConverter_t if the part is a resource converter, otherwise nullptr.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_ResourceHarvester(krpc_connection_t connection, krpc_SpaceCenter_ResourceHarvester_t * result)

A krpc_SpaceCenter_ResourceHarvester_t if the part is a resource harvester, otherwise nullptr.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_Sensor(krpc_connection_t connection, krpc_SpaceCenter_Sensor_t * result)

A krpc_SpaceCenter_Sensor_t if the part is a sensor, otherwise nullptr.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_SolarPanel(krpc_connection_t connection, krpc_SpaceCenter_SolarPanel_t * result)

A krpc_SpaceCenter_SolarPanel_t if the part is a solar panel, otherwise nullptr.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_Wheel(krpc_connection_t connection, krpc_SpaceCenter_Wheel_t * result)

A krpc_SpaceCenter_Wheel_t if the part is a wheel, otherwise nullptr.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_Position(krpc_connection_t connection, krpc_tuple_double_double_double_t * result, krpc_SpaceCenter_ReferenceFrame_t referenceFrame)

The position of the part in the given reference frame.

Parameters: referenceFrame – The reference frame that the returned position vector is in. The position as a vector. All

Note

This is a fixed position in the part, defined by the parts model. It s not necessarily the same as the parts center of mass. Use krpc_SpaceCenter_Part_CenterOfMass() to get the parts center of mass.

krpc_error_t krpc_SpaceCenter_Part_CenterOfMass(krpc_connection_t connection, krpc_tuple_double_double_double_t * result, krpc_SpaceCenter_ReferenceFrame_t referenceFrame)

The position of the parts center of mass in the given reference frame. If the part is physicsless, this is equivalent to krpc_SpaceCenter_Part_Position().

Parameters: referenceFrame – The reference frame that the returned position vector is in. The position as a vector. All
krpc_error_t krpc_SpaceCenter_Part_BoundingBox(krpc_connection_t connection, krpc_tuple_tuple_double_double_double_tuple_double_double_double_t * result, krpc_SpaceCenter_ReferenceFrame_t referenceFrame)

The axis-aligned bounding box of the part in the given reference frame.

Parameters: referenceFrame – The reference frame that the returned position vectors are in. The positions of the minimum and maximum vertices of the box, as position vectors. All

Note

This is computed from the collision mesh of the part. If the part is not collidable, the box has zero volume and is centered on the krpc_SpaceCenter_Part_Position() of the part.

krpc_error_t krpc_SpaceCenter_Part_Direction(krpc_connection_t connection, krpc_tuple_double_double_double_t * result, krpc_SpaceCenter_ReferenceFrame_t referenceFrame)

The direction the part points in, in the given reference frame.

Parameters: referenceFrame – The reference frame that the returned direction is in. The direction as a unit vector. All
krpc_error_t krpc_SpaceCenter_Part_Velocity(krpc_connection_t connection, krpc_tuple_double_double_double_t * result, krpc_SpaceCenter_ReferenceFrame_t referenceFrame)

The linear velocity of the part in the given reference frame.

Parameters: referenceFrame – The reference frame that the returned velocity vector is in. The velocity as a vector. The vector points in the direction of travel, and its magnitude is the speed of the body in meters per second. All
krpc_error_t krpc_SpaceCenter_Part_Rotation(krpc_connection_t connection, krpc_tuple_double_double_double_double_t * result, krpc_SpaceCenter_ReferenceFrame_t referenceFrame)

The rotation of the part, in the given reference frame.

Parameters: referenceFrame – The reference frame that the returned rotation is in. The rotation as a quaternion of the form $$(x, y, z, w)$$. All
krpc_error_t krpc_SpaceCenter_Part_MomentOfInertia(krpc_connection_t connection, krpc_tuple_double_double_double_t * result)

The moment of inertia of the part in $$kg.m^2$$ around its center of mass in the parts reference frame (krpc_SpaceCenter_ReferenceFrame_t).

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_InertiaTensor(krpc_connection_t connection, krpc_list_double_t * result)

The inertia tensor of the part in the parts reference frame (krpc_SpaceCenter_ReferenceFrame_t). Returns the 3x3 matrix as a list of elements, in row-major order.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Part_ReferenceFrame(krpc_connection_t connection, krpc_SpaceCenter_ReferenceFrame_t * result)

The reference frame that is fixed relative to this part, and centered on a fixed position within the part, defined by the parts model.

Game Scenes: All

Note

For docking port parts, this reference frame is not necessarily equivalent to the reference frame for the docking port, returned by krpc_SpaceCenter_DockingPort_ReferenceFrame().

Mk1 Command Pod reference frame origin and axes

krpc_error_t krpc_SpaceCenter_Part_CenterOfMassReferenceFrame(krpc_connection_t connection, krpc_SpaceCenter_ReferenceFrame_t * result)

The reference frame that is fixed relative to this part, and centered on its center of mass.

Game Scenes: All

Note

For docking port parts, this reference frame is not necessarily equivalent to the reference frame for the docking port, returned by krpc_SpaceCenter_DockingPort_ReferenceFrame().

krpc_error_t krpc_SpaceCenter_Part_AddForce(krpc_connection_t connection, krpc_SpaceCenter_Force_t * result, const krpc_tuple_double_double_double_t * force, const krpc_tuple_double_double_double_t * position, krpc_SpaceCenter_ReferenceFrame_t referenceFrame)

Exert a constant force on the part, acting at the given position.

Parameters: force – A vector pointing in the direction that the force acts, with its magnitude equal to the strength of the force in Newtons. position – The position at which the force acts, as a vector. referenceFrame – The reference frame that the force and position are in. An object that can be used to remove or modify the force. All
krpc_error_t krpc_SpaceCenter_Part_InstantaneousForce(krpc_connection_t connection, const krpc_tuple_double_double_double_t * force, const krpc_tuple_double_double_double_t * position, krpc_SpaceCenter_ReferenceFrame_t referenceFrame)

Exert an instantaneous force on the part, acting at the given position.

Parameters: force – A vector pointing in the direction that the force acts, with its magnitude equal to the strength of the force in Newtons. position – The position at which the force acts, as a vector. referenceFrame – The reference frame that the force and position are in. All

Note

The force is applied instantaneously in a single physics update.

krpc_SpaceCenter_Force_t

Obtained by calling krpc_SpaceCenter_Part_AddForce().

krpc_error_t krpc_SpaceCenter_Force_Part(krpc_connection_t connection, krpc_SpaceCenter_Part_t * result)

The part that this force is applied to.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Force_ForceVector(krpc_connection_t connection, krpc_tuple_double_double_double_t * result)
void krpc_SpaceCenter_Force_set_ForceVector(const krpc_tuple_double_double_double_t * value)

The force vector, in Newtons.

Returns: A vector pointing in the direction that the force acts, with its magnitude equal to the strength of the force in Newtons. All
krpc_error_t krpc_SpaceCenter_Force_Position(krpc_connection_t connection, krpc_tuple_double_double_double_t * result)
void krpc_SpaceCenter_Force_set_Position(const krpc_tuple_double_double_double_t * value)

The position at which the force acts, in reference frame krpc_SpaceCenter_ReferenceFrame_t.

Returns: The position as a vector. All
krpc_error_t krpc_SpaceCenter_Force_ReferenceFrame(krpc_connection_t connection, krpc_SpaceCenter_ReferenceFrame_t * result)
void krpc_SpaceCenter_Force_set_ReferenceFrame(krpc_SpaceCenter_ReferenceFrame_t value)

The reference frame of the force vector and position.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Force_Remove(krpc_connection_t connection)

Remove the force.

Game Scenes: All

## Module¶

krpc_SpaceCenter_Module_t

This can be used to interact with a specific part module. This includes part modules in stock KSP, and those added by mods.

In KSP, each part has zero or more PartModules associated with it. Each one contains some of the functionality of the part. For example, an engine has a “ModuleEngines” part module that contains all the functionality of an engine.

krpc_error_t krpc_SpaceCenter_Module_Name(krpc_connection_t connection, char * * result)

Name of the PartModule. For example, “ModuleEngines”.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Module_Part(krpc_connection_t connection, krpc_SpaceCenter_Part_t * result)

The part that contains this module.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Module_Fields(krpc_connection_t connection, krpc_dictionary_string_string_t * result)

The modules field names and their associated values, as a dictionary. These are the values visible in the right-click menu of the part.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Module_HasField(krpc_connection_t connection, bool * result, const char * name)

Returns true if the module has a field with the given name.

Parameters: name – Name of the field. All
krpc_error_t krpc_SpaceCenter_Module_GetField(krpc_connection_t connection, char * * result, const char * name)

Returns the value of a field.

Parameters: name – Name of the field. All
krpc_error_t krpc_SpaceCenter_Module_SetFieldInt(krpc_connection_t connection, const char * name, int32_t value)

Set the value of a field to the given integer number.

Parameters: name – Name of the field. value – Value to set. All
krpc_error_t krpc_SpaceCenter_Module_SetFieldFloat(krpc_connection_t connection, const char * name, float value)

Set the value of a field to the given floating point number.

Parameters: name – Name of the field. value – Value to set. All
krpc_error_t krpc_SpaceCenter_Module_SetFieldString(krpc_connection_t connection, const char * name, const char * value)

Set the value of a field to the given string.

Parameters: name – Name of the field. value – Value to set. All
krpc_error_t krpc_SpaceCenter_Module_ResetField(krpc_connection_t connection, const char * name)

Set the value of a field to its original value.

Parameters: name – Name of the field. All
krpc_error_t krpc_SpaceCenter_Module_Events(krpc_connection_t connection, krpc_list_string_t * result)

A list of the names of all of the modules events. Events are the clickable buttons visible in the right-click menu of the part.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Module_HasEvent(krpc_connection_t connection, bool * result, const char * name)

true if the module has an event with the given name.

Parameters: All
krpc_error_t krpc_SpaceCenter_Module_TriggerEvent(krpc_connection_t connection, const char * name)

Trigger the named event. Equivalent to clicking the button in the right-click menu of the part.

Parameters: All
krpc_error_t krpc_SpaceCenter_Module_Actions(krpc_connection_t connection, krpc_list_string_t * result)

A list of all the names of the modules actions. These are the parts actions that can be assigned to action groups in the in-game editor.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Module_HasAction(krpc_connection_t connection, bool * result, const char * name)

true if the part has an action with the given name.

Parameters: All
krpc_error_t krpc_SpaceCenter_Module_SetAction(krpc_connection_t connection, const char * name, bool value)

Set the value of an action with the given name.

Parameters: All

## Specific Types of Part¶

The following classes provide functionality for specific types of part.

### Antenna¶

krpc_SpaceCenter_Antenna_t

An antenna. Obtained by calling krpc_SpaceCenter_Part_Antenna().

krpc_error_t krpc_SpaceCenter_Antenna_Part(krpc_connection_t connection, krpc_SpaceCenter_Part_t * result)

The part object for this antenna.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Antenna_State(krpc_connection_t connection, krpc_SpaceCenter_AntennaState_t * result)

The current state of the antenna.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Antenna_Deployable(krpc_connection_t connection, bool * result)

Whether the antenna is deployable.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Antenna_Deployed(krpc_connection_t connection, bool * result)
void krpc_SpaceCenter_Antenna_set_Deployed(bool value)

Whether the antenna is deployed.

Game Scenes: All

Note

Fixed antennas are always deployed. Returns an error if you try to deploy a fixed antenna.

krpc_error_t krpc_SpaceCenter_Antenna_CanTransmit(krpc_connection_t connection, bool * result)

Whether data can be transmitted by this antenna.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Antenna_Transmit(krpc_connection_t connection)

Transmit data.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Antenna_Cancel(krpc_connection_t connection)

Cancel current transmission of data.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Antenna_AllowPartial(krpc_connection_t connection, bool * result)
void krpc_SpaceCenter_Antenna_set_AllowPartial(bool value)

Whether partial data transmission is permitted.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Antenna_Power(krpc_connection_t connection, double * result)

The power of the antenna.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Antenna_Combinable(krpc_connection_t connection, bool * result)

Whether the antenna can be combined with other antennae on the vessel to boost the power.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Antenna_CombinableExponent(krpc_connection_t connection, double * result)

Exponent used to calculate the combined power of multiple antennae on a vessel.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Antenna_PacketInterval(krpc_connection_t connection, float * result)

Interval between sending packets in seconds.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Antenna_PacketSize(krpc_connection_t connection, float * result)

Amount of data sent per packet in Mits.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Antenna_PacketResourceCost(krpc_connection_t connection, double * result)

Units of electric charge consumed per packet sent.

Game Scenes: All
krpc_SpaceCenter_AntennaState_t

The state of an antenna. See krpc_SpaceCenter_Antenna_State().

KRPC_SPACECENTER_ANTENNASTATE_DEPLOYED

Antenna is fully deployed.

KRPC_SPACECENTER_ANTENNASTATE_RETRACTED

Antenna is fully retracted.

KRPC_SPACECENTER_ANTENNASTATE_DEPLOYING

Antenna is being deployed.

KRPC_SPACECENTER_ANTENNASTATE_RETRACTING

Antenna is being retracted.

KRPC_SPACECENTER_ANTENNASTATE_BROKEN

Antenna is broken.

### Cargo Bay¶

krpc_SpaceCenter_CargoBay_t

A cargo bay. Obtained by calling krpc_SpaceCenter_Part_CargoBay().

krpc_error_t krpc_SpaceCenter_CargoBay_Part(krpc_connection_t connection, krpc_SpaceCenter_Part_t * result)

The part object for this cargo bay.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_CargoBay_State(krpc_connection_t connection, krpc_SpaceCenter_CargoBayState_t * result)

The state of the cargo bay.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_CargoBay_Open(krpc_connection_t connection, bool * result)
void krpc_SpaceCenter_CargoBay_set_Open(bool value)

Whether the cargo bay is open.

Game Scenes: All
krpc_SpaceCenter_CargoBayState_t

The state of a cargo bay. See krpc_SpaceCenter_CargoBay_State().

KRPC_SPACECENTER_CARGOBAYSTATE_OPEN

Cargo bay is fully open.

KRPC_SPACECENTER_CARGOBAYSTATE_CLOSED

Cargo bay closed and locked.

KRPC_SPACECENTER_CARGOBAYSTATE_OPENING

Cargo bay is opening.

KRPC_SPACECENTER_CARGOBAYSTATE_CLOSING

Cargo bay is closing.

### Control Surface¶

krpc_SpaceCenter_ControlSurface_t

An aerodynamic control surface. Obtained by calling krpc_SpaceCenter_Part_ControlSurface().

krpc_error_t krpc_SpaceCenter_ControlSurface_Part(krpc_connection_t connection, krpc_SpaceCenter_Part_t * result)

The part object for this control surface.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_ControlSurface_PitchEnabled(krpc_connection_t connection, bool * result)
void krpc_SpaceCenter_ControlSurface_set_PitchEnabled(bool value)

Whether the control surface has pitch control enabled.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_ControlSurface_YawEnabled(krpc_connection_t connection, bool * result)
void krpc_SpaceCenter_ControlSurface_set_YawEnabled(bool value)

Whether the control surface has yaw control enabled.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_ControlSurface_RollEnabled(krpc_connection_t connection, bool * result)
void krpc_SpaceCenter_ControlSurface_set_RollEnabled(bool value)

Whether the control surface has roll control enabled.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_ControlSurface_AuthorityLimiter(krpc_connection_t connection, float * result)
void krpc_SpaceCenter_ControlSurface_set_AuthorityLimiter(float value)

The authority limiter for the control surface, which controls how far the control surface will move.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_ControlSurface_Inverted(krpc_connection_t connection, bool * result)
void krpc_SpaceCenter_ControlSurface_set_Inverted(bool value)

Whether the control surface movement is inverted.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_ControlSurface_Deployed(krpc_connection_t connection, bool * result)
void krpc_SpaceCenter_ControlSurface_set_Deployed(bool value)

Whether the control surface has been fully deployed.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_ControlSurface_SurfaceArea(krpc_connection_t connection, float * result)

Surface area of the control surface in $$m^2$$.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_ControlSurface_AvailableTorque(krpc_connection_t connection, krpc_tuple_tuple_double_double_double_tuple_double_double_double_t * result)

The available torque, in Newton meters, that can be produced by this control surface, in the positive and negative pitch, roll and yaw axes of the vessel. These axes correspond to the coordinate axes of the krpc_SpaceCenter_Vessel_ReferenceFrame().

Game Scenes: All

### Decoupler¶

krpc_SpaceCenter_Decoupler_t

A decoupler. Obtained by calling krpc_SpaceCenter_Part_Decoupler()

krpc_error_t krpc_SpaceCenter_Decoupler_Part(krpc_connection_t connection, krpc_SpaceCenter_Part_t * result)

The part object for this decoupler.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Decoupler_Decouple(krpc_connection_t connection, krpc_SpaceCenter_Vessel_t * result)

Fires the decoupler. Returns the new vessel created when the decoupler fires. Throws an exception if the decoupler has already fired.

Game Scenes: All

Note

When called, the active vessel may change. It is therefore possible that, after calling this function, the object(s) returned by previous call(s) to krpc_SpaceCenter_ActiveVessel() no longer refer to the active vessel.

krpc_error_t krpc_SpaceCenter_Decoupler_Decoupled(krpc_connection_t connection, bool * result)

Whether the decoupler has fired.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Decoupler_Staged(krpc_connection_t connection, bool * result)

Whether the decoupler is enabled in the staging sequence.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Decoupler_Impulse(krpc_connection_t connection, float * result)

The impulse that the decoupler imparts when it is fired, in Newton seconds.

Game Scenes: All

### Docking Port¶

krpc_SpaceCenter_DockingPort_t

A docking port. Obtained by calling krpc_SpaceCenter_Part_DockingPort()

krpc_error_t krpc_SpaceCenter_DockingPort_Part(krpc_connection_t connection, krpc_SpaceCenter_Part_t * result)

The part object for this docking port.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_DockingPort_State(krpc_connection_t connection, krpc_SpaceCenter_DockingPortState_t * result)

The current state of the docking port.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_DockingPort_DockedPart(krpc_connection_t connection, krpc_SpaceCenter_Part_t * result)

The part that this docking port is docked to. Returns nullptr if this docking port is not docked to anything.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_DockingPort_Undock(krpc_connection_t connection, krpc_SpaceCenter_Vessel_t * result)

Undocks the docking port and returns the new krpc_SpaceCenter_Vessel_t that is created. This method can be called for either docking port in a docked pair. Throws an exception if the docking port is not docked to anything.

Game Scenes: All

Note

When called, the active vessel may change. It is therefore possible that, after calling this function, the object(s) returned by previous call(s) to krpc_SpaceCenter_ActiveVessel() no longer refer to the active vessel.

krpc_error_t krpc_SpaceCenter_DockingPort_ReengageDistance(krpc_connection_t connection, float * result)

The distance a docking port must move away when it undocks before it becomes ready to dock with another port, in meters.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_DockingPort_HasShield(krpc_connection_t connection, bool * result)

Whether the docking port has a shield.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_DockingPort_Shielded(krpc_connection_t connection, bool * result)
void krpc_SpaceCenter_DockingPort_set_Shielded(bool value)

The state of the docking ports shield, if it has one.

Returns true if the docking port has a shield, and the shield is closed. Otherwise returns false. When set to true, the shield is closed, and when set to false the shield is opened. If the docking port does not have a shield, setting this attribute has no effect.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_DockingPort_Position(krpc_connection_t connection, krpc_tuple_double_double_double_t * result, krpc_SpaceCenter_ReferenceFrame_t referenceFrame)

The position of the docking port, in the given reference frame.

Parameters: referenceFrame – The reference frame that the returned position vector is in. The position as a vector. All
krpc_error_t krpc_SpaceCenter_DockingPort_Direction(krpc_connection_t connection, krpc_tuple_double_double_double_t * result, krpc_SpaceCenter_ReferenceFrame_t referenceFrame)

The direction that docking port points in, in the given reference frame.

Parameters: referenceFrame – The reference frame that the returned direction is in. The direction as a unit vector. All
krpc_error_t krpc_SpaceCenter_DockingPort_Rotation(krpc_connection_t connection, krpc_tuple_double_double_double_double_t * result, krpc_SpaceCenter_ReferenceFrame_t referenceFrame)

The rotation of the docking port, in the given reference frame.

Parameters: referenceFrame – The reference frame that the returned rotation is in. The rotation as a quaternion of the form $$(x, y, z, w)$$. All
krpc_error_t krpc_SpaceCenter_DockingPort_ReferenceFrame(krpc_connection_t connection, krpc_SpaceCenter_ReferenceFrame_t * result)

The reference frame that is fixed relative to this docking port, and oriented with the port.

• The origin is at the position of the docking port.
• The axes rotate with the docking port.
• The x-axis points out to the right side of the docking port.
• The y-axis points in the direction the docking port is facing.
• The z-axis points out of the bottom off the docking port.
Game Scenes: All

Note

This reference frame is not necessarily equivalent to the reference frame for the part, returned by krpc_SpaceCenter_Part_ReferenceFrame().

Docking port reference frame origin and axes

Inline docking port reference frame origin and axes

krpc_SpaceCenter_DockingPortState_t

The state of a docking port. See krpc_SpaceCenter_DockingPort_State().

KRPC_SPACECENTER_DOCKINGPORTSTATE_READY

The docking port is ready to dock to another docking port.

KRPC_SPACECENTER_DOCKINGPORTSTATE_DOCKED

The docking port is docked to another docking port, or docked to another part (from the VAB/SPH).

KRPC_SPACECENTER_DOCKINGPORTSTATE_DOCKING

The docking port is very close to another docking port, but has not docked. It is using magnetic force to acquire a solid dock.

KRPC_SPACECENTER_DOCKINGPORTSTATE_UNDOCKING

The docking port has just been undocked from another docking port, and is disabled until it moves away by a sufficient distance (krpc_SpaceCenter_DockingPort_ReengageDistance()).

KRPC_SPACECENTER_DOCKINGPORTSTATE_SHIELDED

The docking port has a shield, and the shield is closed.

KRPC_SPACECENTER_DOCKINGPORTSTATE_MOVING

The docking ports shield is currently opening/closing.

### Engine¶

krpc_SpaceCenter_Engine_t

An engine, including ones of various types. For example liquid fuelled gimballed engines, solid rocket boosters and jet engines. Obtained by calling krpc_SpaceCenter_Part_Engine().

krpc_error_t krpc_SpaceCenter_Engine_Part(krpc_connection_t connection, krpc_SpaceCenter_Part_t * result)

The part object for this engine.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Engine_Active(krpc_connection_t connection, bool * result)
void krpc_SpaceCenter_Engine_set_Active(bool value)

Whether the engine is active. Setting this attribute may have no effect, depending on krpc_SpaceCenter_Engine_CanShutdown() and krpc_SpaceCenter_Engine_CanRestart().

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Engine_Thrust(krpc_connection_t connection, float * result)

The current amount of thrust being produced by the engine, in Newtons.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Engine_AvailableThrust(krpc_connection_t connection, float * result)

The amount of thrust, in Newtons, that would be produced by the engine when activated and with its throttle set to 100%. Returns zero if the engine does not have any fuel. Takes the engine’s current krpc_SpaceCenter_Engine_ThrustLimit() and atmospheric conditions into account.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Engine_MaxThrust(krpc_connection_t connection, float * result)

The amount of thrust, in Newtons, that would be produced by the engine when activated and fueled, with its throttle and throttle limiter set to 100%.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Engine_MaxVacuumThrust(krpc_connection_t connection, float * result)

The maximum amount of thrust that can be produced by the engine in a vacuum, in Newtons. This is the amount of thrust produced by the engine when activated, krpc_SpaceCenter_Engine_ThrustLimit() is set to 100%, the main vessel’s throttle is set to 100% and the engine is in a vacuum.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Engine_ThrustLimit(krpc_connection_t connection, float * result)
void krpc_SpaceCenter_Engine_set_ThrustLimit(float value)

The thrust limiter of the engine. A value between 0 and 1. Setting this attribute may have no effect, for example the thrust limit for a solid rocket booster cannot be changed in flight.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Engine_Thrusters(krpc_connection_t connection, krpc_list_object_t * result)

The components of the engine that generate thrust.

Game Scenes: All

Note

For example, this corresponds to the rocket nozzel on a solid rocket booster, or the individual nozzels on a RAPIER engine. The overall thrust produced by the engine, as reported by krpc_SpaceCenter_Engine_AvailableThrust(), krpc_SpaceCenter_Engine_MaxThrust() and others, is the sum of the thrust generated by each thruster.

krpc_error_t krpc_SpaceCenter_Engine_SpecificImpulse(krpc_connection_t connection, float * result)

The current specific impulse of the engine, in seconds. Returns zero if the engine is not active.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Engine_VacuumSpecificImpulse(krpc_connection_t connection, float * result)

The vacuum specific impulse of the engine, in seconds.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Engine_KerbinSeaLevelSpecificImpulse(krpc_connection_t connection, float * result)

The specific impulse of the engine at sea level on Kerbin, in seconds.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Engine_PropellantNames(krpc_connection_t connection, krpc_list_string_t * result)

The names of the propellants that the engine consumes.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Engine_PropellantRatios(krpc_connection_t connection, krpc_dictionary_string_float_t * result)

The ratio of resources that the engine consumes. A dictionary mapping resource names to the ratio at which they are consumed by the engine.

Game Scenes: All

Note

For example, if the ratios are 0.6 for LiquidFuel and 0.4 for Oxidizer, then for every 0.6 units of LiquidFuel that the engine burns, it will burn 0.4 units of Oxidizer.

krpc_error_t krpc_SpaceCenter_Engine_Propellants(krpc_connection_t connection, krpc_list_object_t * result)

The propellants that the engine consumes.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Engine_HasFuel(krpc_connection_t connection, bool * result)

Whether the engine has any fuel available.

Game Scenes: All

Note

The engine must be activated for this property to update correctly.

krpc_error_t krpc_SpaceCenter_Engine_Throttle(krpc_connection_t connection, float * result)

The current throttle setting for the engine. A value between 0 and 1. This is not necessarily the same as the vessel’s main throttle setting, as some engines take time to adjust their throttle (such as jet engines).

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Engine_ThrottleLocked(krpc_connection_t connection, bool * result)

Whether the krpc_SpaceCenter_Control_Throttle() affects the engine. For example, this is true for liquid fueled rockets, and false for solid rocket boosters.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Engine_CanRestart(krpc_connection_t connection, bool * result)

Whether the engine can be restarted once shutdown. If the engine cannot be shutdown, returns false. For example, this is true for liquid fueled rockets and false for solid rocket boosters.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Engine_CanShutdown(krpc_connection_t connection, bool * result)

Whether the engine can be shutdown once activated. For example, this is true for liquid fueled rockets and false for solid rocket boosters.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Engine_HasModes(krpc_connection_t connection, bool * result)

Whether the engine has multiple modes of operation.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Engine_Mode(krpc_connection_t connection, char * * result)
void krpc_SpaceCenter_Engine_set_Mode(const char * value)

The name of the current engine mode.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Engine_Modes(krpc_connection_t connection, krpc_dictionary_string_object_t * result)

The available modes for the engine. A dictionary mapping mode names to krpc_SpaceCenter_Engine_t objects.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Engine_ToggleMode(krpc_connection_t connection)

Toggle the current engine mode.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Engine_AutoModeSwitch(krpc_connection_t connection, bool * result)
void krpc_SpaceCenter_Engine_set_AutoModeSwitch(bool value)

Whether the engine will automatically switch modes.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Engine_Gimballed(krpc_connection_t connection, bool * result)

Whether the engine is gimballed.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Engine_GimbalRange(krpc_connection_t connection, float * result)

The range over which the gimbal can move, in degrees. Returns 0 if the engine is not gimballed.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Engine_GimbalLocked(krpc_connection_t connection, bool * result)
void krpc_SpaceCenter_Engine_set_GimbalLocked(bool value)

Whether the engines gimbal is locked in place. Setting this attribute has no effect if the engine is not gimballed.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Engine_GimbalLimit(krpc_connection_t connection, float * result)
void krpc_SpaceCenter_Engine_set_GimbalLimit(float value)

The gimbal limiter of the engine. A value between 0 and 1. Returns 0 if the gimbal is locked.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Engine_AvailableTorque(krpc_connection_t connection, krpc_tuple_tuple_double_double_double_tuple_double_double_double_t * result)

The available torque, in Newton meters, that can be produced by this engine, in the positive and negative pitch, roll and yaw axes of the vessel. These axes correspond to the coordinate axes of the krpc_SpaceCenter_Vessel_ReferenceFrame(). Returns zero if the engine is inactive, or not gimballed.

Game Scenes: All
krpc_SpaceCenter_Propellant_t

A propellant for an engine. Obtains by calling krpc_SpaceCenter_Engine_Propellants().

krpc_error_t krpc_SpaceCenter_Propellant_Name(krpc_connection_t connection, char * * result)

The name of the propellant.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Propellant_CurrentAmount(krpc_connection_t connection, double * result)

The current amount of propellant.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Propellant_CurrentRequirement(krpc_connection_t connection, double * result)

The required amount of propellant.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Propellant_TotalResourceAvailable(krpc_connection_t connection, double * result)

The total amount of the underlying resource currently reachable given resource flow rules.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Propellant_TotalResourceCapacity(krpc_connection_t connection, double * result)

The total vehicle capacity for the underlying propellant resource, restricted by resource flow rules.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Propellant_IgnoreForIsp(krpc_connection_t connection, bool * result)

If this propellant should be ignored when calculating required mass flow given specific impulse.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Propellant_IgnoreForThrustCurve(krpc_connection_t connection, bool * result)

If this propellant should be ignored for thrust curve calculations.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Propellant_DrawStackGauge(krpc_connection_t connection, bool * result)

If this propellant has a stack gauge or not.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Propellant_IsDeprived(krpc_connection_t connection, bool * result)

If this propellant is deprived.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Propellant_Ratio(krpc_connection_t connection, float * result)

The propellant ratio.

Game Scenes: All

### Experiment¶

krpc_SpaceCenter_Experiment_t

Obtained by calling krpc_SpaceCenter_Part_Experiment().

krpc_error_t krpc_SpaceCenter_Experiment_Part(krpc_connection_t connection, krpc_SpaceCenter_Part_t * result)

The part object for this experiment.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Experiment_Run(krpc_connection_t connection)

Run the experiment.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Experiment_Transmit(krpc_connection_t connection)

Transmit all experimental data contained by this part.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Experiment_Dump(krpc_connection_t connection)

Dump the experimental data contained by the experiment.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Experiment_Reset(krpc_connection_t connection)

Reset the experiment.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Experiment_Deployed(krpc_connection_t connection, bool * result)

Whether the experiment has been deployed.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Experiment_Rerunnable(krpc_connection_t connection, bool * result)

Whether the experiment can be re-run.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Experiment_Inoperable(krpc_connection_t connection, bool * result)

Whether the experiment is inoperable.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Experiment_HasData(krpc_connection_t connection, bool * result)

Whether the experiment contains data.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Experiment_Data(krpc_connection_t connection, krpc_list_object_t * result)

The data contained in this experiment.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Experiment_Biome(krpc_connection_t connection, char * * result)

The name of the biome the experiment is currently in.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Experiment_Available(krpc_connection_t connection, bool * result)

Determines if the experiment is available given the current conditions.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Experiment_ScienceSubject(krpc_connection_t connection, krpc_SpaceCenter_ScienceSubject_t * result)

Containing information on the corresponding specific science result for the current conditions. Returns nullptr if the experiment is unavailable.

Game Scenes: All
krpc_SpaceCenter_ScienceData_t

Obtained by calling krpc_SpaceCenter_Experiment_Data().

krpc_error_t krpc_SpaceCenter_ScienceData_DataAmount(krpc_connection_t connection, float * result)

Data amount.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_ScienceData_ScienceValue(krpc_connection_t connection, float * result)

Science value.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_ScienceData_TransmitValue(krpc_connection_t connection, float * result)

Transmit value.

Game Scenes: All
krpc_SpaceCenter_ScienceSubject_t

Obtained by calling krpc_SpaceCenter_Experiment_ScienceSubject().

krpc_error_t krpc_SpaceCenter_ScienceSubject_Title(krpc_connection_t connection, char * * result)

Title of science subject, displayed in science archives

Game Scenes: All
krpc_error_t krpc_SpaceCenter_ScienceSubject_IsComplete(krpc_connection_t connection, bool * result)

Whether the experiment has been completed.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_ScienceSubject_Science(krpc_connection_t connection, float * result)

Amount of science already earned from this subject, not updated until after transmission/recovery.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_ScienceSubject_ScienceCap(krpc_connection_t connection, float * result)

Total science allowable for this subject.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_ScienceSubject_DataScale(krpc_connection_t connection, float * result)

Multiply science value by this to determine data amount in mits.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_ScienceSubject_SubjectValue(krpc_connection_t connection, float * result)

Multiplier for specific Celestial Body/Experiment Situation combination.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_ScienceSubject_ScientificValue(krpc_connection_t connection, float * result)

Diminishing value multiplier for decreasing the science value returned from repeated experiments.

Game Scenes: All

### Fairing¶

krpc_SpaceCenter_Fairing_t

A fairing. Obtained by calling krpc_SpaceCenter_Part_Fairing().

krpc_error_t krpc_SpaceCenter_Fairing_Part(krpc_connection_t connection, krpc_SpaceCenter_Part_t * result)

The part object for this fairing.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Fairing_Jettison(krpc_connection_t connection)

Jettison the fairing. Has no effect if it has already been jettisoned.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Fairing_Jettisoned(krpc_connection_t connection, bool * result)

Whether the fairing has been jettisoned.

Game Scenes: All

### Intake¶

krpc_SpaceCenter_Intake_t

An air intake. Obtained by calling krpc_SpaceCenter_Part_Intake().

krpc_error_t krpc_SpaceCenter_Intake_Part(krpc_connection_t connection, krpc_SpaceCenter_Part_t * result)

The part object for this intake.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Intake_Open(krpc_connection_t connection, bool * result)
void krpc_SpaceCenter_Intake_set_Open(bool value)

Whether the intake is open.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Intake_Speed(krpc_connection_t connection, float * result)

Speed of the flow into the intake, in $$m/s$$.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Intake_Flow(krpc_connection_t connection, float * result)

The rate of flow into the intake, in units of resource per second.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Intake_Area(krpc_connection_t connection, float * result)

The area of the intake’s opening, in square meters.

Game Scenes: All

### Leg¶

krpc_SpaceCenter_Leg_t

A landing leg. Obtained by calling krpc_SpaceCenter_Part_Leg().

krpc_error_t krpc_SpaceCenter_Leg_Part(krpc_connection_t connection, krpc_SpaceCenter_Part_t * result)

The part object for this landing leg.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Leg_State(krpc_connection_t connection, krpc_SpaceCenter_LegState_t * result)

The current state of the landing leg.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Leg_Deployable(krpc_connection_t connection, bool * result)

Whether the leg is deployable.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Leg_Deployed(krpc_connection_t connection, bool * result)
void krpc_SpaceCenter_Leg_set_Deployed(bool value)

Whether the landing leg is deployed.

Game Scenes: All

Note

Fixed landing legs are always deployed. Returns an error if you try to deploy fixed landing gear.

krpc_error_t krpc_SpaceCenter_Leg_IsGrounded(krpc_connection_t connection, bool * result)

Returns whether the leg is touching the ground.

Game Scenes: All
krpc_SpaceCenter_LegState_t

The state of a landing leg. See krpc_SpaceCenter_Leg_State().

KRPC_SPACECENTER_LEGSTATE_DEPLOYED

Landing leg is fully deployed.

KRPC_SPACECENTER_LEGSTATE_RETRACTED

Landing leg is fully retracted.

KRPC_SPACECENTER_LEGSTATE_DEPLOYING

Landing leg is being deployed.

KRPC_SPACECENTER_LEGSTATE_RETRACTING

Landing leg is being retracted.

KRPC_SPACECENTER_LEGSTATE_BROKEN

Landing leg is broken.

### Launch Clamp¶

krpc_SpaceCenter_LaunchClamp_t

A launch clamp. Obtained by calling krpc_SpaceCenter_Part_LaunchClamp().

krpc_error_t krpc_SpaceCenter_LaunchClamp_Part(krpc_connection_t connection, krpc_SpaceCenter_Part_t * result)

The part object for this launch clamp.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_LaunchClamp_Release(krpc_connection_t connection)

Releases the docking clamp. Has no effect if the clamp has already been released.

Game Scenes: All

### Light¶

krpc_SpaceCenter_Light_t

A light. Obtained by calling krpc_SpaceCenter_Part_Light().

krpc_error_t krpc_SpaceCenter_Light_Part(krpc_connection_t connection, krpc_SpaceCenter_Part_t * result)

The part object for this light.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Light_Active(krpc_connection_t connection, bool * result)
void krpc_SpaceCenter_Light_set_Active(bool value)

Whether the light is switched on.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Light_Color(krpc_connection_t connection, krpc_tuple_float_float_float_t * result)
void krpc_SpaceCenter_Light_set_Color(const krpc_tuple_float_float_float_t * value)

The color of the light, as an RGB triple.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Light_PowerUsage(krpc_connection_t connection, float * result)

The current power usage, in units of charge per second.

Game Scenes: All

### Parachute¶

krpc_SpaceCenter_Parachute_t

A parachute. Obtained by calling krpc_SpaceCenter_Part_Parachute().

krpc_error_t krpc_SpaceCenter_Parachute_Part(krpc_connection_t connection, krpc_SpaceCenter_Part_t * result)

The part object for this parachute.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Parachute_Deploy(krpc_connection_t connection)

Deploys the parachute. This has no effect if the parachute has already been deployed.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Parachute_Deployed(krpc_connection_t connection, bool * result)

Whether the parachute has been deployed.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Parachute_Arm(krpc_connection_t connection)

Deploys the parachute. This has no effect if the parachute has already been armed or deployed. Only applicable to RealChutes parachutes.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Parachute_Armed(krpc_connection_t connection, bool * result)

Whether the parachute has been armed or deployed. Only applicable to RealChutes parachutes.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Parachute_State(krpc_connection_t connection, krpc_SpaceCenter_ParachuteState_t * result)

The current state of the parachute.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Parachute_DeployAltitude(krpc_connection_t connection, float * result)
void krpc_SpaceCenter_Parachute_set_DeployAltitude(float value)

The altitude at which the parachute will full deploy, in meters. Only applicable to stock parachutes.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Parachute_DeployMinPressure(krpc_connection_t connection, float * result)
void krpc_SpaceCenter_Parachute_set_DeployMinPressure(float value)

The minimum pressure at which the parachute will semi-deploy, in atmospheres. Only applicable to stock parachutes.

Game Scenes: All
krpc_SpaceCenter_ParachuteState_t

The state of a parachute. See krpc_SpaceCenter_Parachute_State().

KRPC_SPACECENTER_PARACHUTESTATE_STOWED

The parachute is safely tucked away inside its housing.

KRPC_SPACECENTER_PARACHUTESTATE_ARMED

The parachute is armed for deployment. (RealChutes only)

KRPC_SPACECENTER_PARACHUTESTATE_ACTIVE

The parachute is still stowed, but ready to semi-deploy. (Stock parachutes only)

KRPC_SPACECENTER_PARACHUTESTATE_SEMIDEPLOYED

The parachute has been deployed and is providing some drag, but is not fully deployed yet. (Stock parachutes only)

KRPC_SPACECENTER_PARACHUTESTATE_DEPLOYED

The parachute is fully deployed.

KRPC_SPACECENTER_PARACHUTESTATE_CUT

The parachute has been cut.

krpc_SpaceCenter_Radiator_t

A radiator. Obtained by calling krpc_SpaceCenter_Part_Radiator().

krpc_error_t krpc_SpaceCenter_Radiator_Part(krpc_connection_t connection, krpc_SpaceCenter_Part_t * result)

The part object for this radiator.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Radiator_Deployable(krpc_connection_t connection, bool * result)

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Radiator_Deployed(krpc_connection_t connection, bool * result)
void krpc_SpaceCenter_Radiator_set_Deployed(bool value)

For a deployable radiator, true if the radiator is extended. If the radiator is not deployable, this is always true.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Radiator_State(krpc_connection_t connection, krpc_SpaceCenter_RadiatorState_t * result)

The current state of the radiator.

Game Scenes: All
krpc_SpaceCenter_RadiatorState_t

The state of a radiator. krpc_SpaceCenter_RadiatorState_t

KRPC_SPACECENTER_RADIATORSTATE_EXTENDED

KRPC_SPACECENTER_RADIATORSTATE_RETRACTED

KRPC_SPACECENTER_RADIATORSTATE_EXTENDING

KRPC_SPACECENTER_RADIATORSTATE_RETRACTING

KRPC_SPACECENTER_RADIATORSTATE_BROKEN

### Resource Converter¶

krpc_SpaceCenter_ResourceConverter_t

A resource converter. Obtained by calling krpc_SpaceCenter_Part_ResourceConverter().

krpc_error_t krpc_SpaceCenter_ResourceConverter_Part(krpc_connection_t connection, krpc_SpaceCenter_Part_t * result)

The part object for this converter.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_ResourceConverter_Count(krpc_connection_t connection, int32_t * result)

The number of converters in the part.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_ResourceConverter_Name(krpc_connection_t connection, char * * result, int32_t index)

The name of the specified converter.

Parameters: index – Index of the converter. All
krpc_error_t krpc_SpaceCenter_ResourceConverter_Active(krpc_connection_t connection, bool * result, int32_t index)

True if the specified converter is active.

Parameters: index – Index of the converter. All
krpc_error_t krpc_SpaceCenter_ResourceConverter_Start(krpc_connection_t connection, int32_t index)

Start the specified converter.

Parameters: index – Index of the converter. All
krpc_error_t krpc_SpaceCenter_ResourceConverter_Stop(krpc_connection_t connection, int32_t index)

Stop the specified converter.

Parameters: index – Index of the converter. All
krpc_error_t krpc_SpaceCenter_ResourceConverter_State(krpc_connection_t connection, krpc_SpaceCenter_ResourceConverterState_t * result, int32_t index)

The state of the specified converter.

Parameters: index – Index of the converter. All
krpc_error_t krpc_SpaceCenter_ResourceConverter_StatusInfo(krpc_connection_t connection, char * * result, int32_t index)

Status information for the specified converter. This is the full status message shown in the in-game UI.

Parameters: index – Index of the converter. All
krpc_error_t krpc_SpaceCenter_ResourceConverter_Inputs(krpc_connection_t connection, krpc_list_string_t * result, int32_t index)

List of the names of resources consumed by the specified converter.

Parameters: index – Index of the converter. All
krpc_error_t krpc_SpaceCenter_ResourceConverter_Outputs(krpc_connection_t connection, krpc_list_string_t * result, int32_t index)

List of the names of resources produced by the specified converter.

Parameters: index – Index of the converter. All
krpc_error_t krpc_SpaceCenter_ResourceConverter_OptimumCoreTemperature(krpc_connection_t connection, float * result)

The core temperature at which the converter will operate with peak efficiency, in Kelvin.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_ResourceConverter_CoreTemperature(krpc_connection_t connection, float * result)

The core temperature of the converter, in Kelvin.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_ResourceConverter_ThermalEfficiency(krpc_connection_t connection, float * result)

The thermal efficiency of the converter, as a percentage of its maximum.

Game Scenes: All
krpc_SpaceCenter_ResourceConverterState_t

The state of a resource converter. See krpc_SpaceCenter_ResourceConverter_State().

KRPC_SPACECENTER_RESOURCECONVERTERSTATE_RUNNING

Converter is running.

KRPC_SPACECENTER_RESOURCECONVERTERSTATE_IDLE

Converter is idle.

KRPC_SPACECENTER_RESOURCECONVERTERSTATE_MISSINGRESOURCE

Converter is missing a required resource.

KRPC_SPACECENTER_RESOURCECONVERTERSTATE_STORAGEFULL

No available storage for output resource.

KRPC_SPACECENTER_RESOURCECONVERTERSTATE_CAPACITY

At preset resource capacity.

KRPC_SPACECENTER_RESOURCECONVERTERSTATE_UNKNOWN

Unknown state. Possible with modified resource converters. In this case, check krpc_SpaceCenter_ResourceConverter_StatusInfo() for more information.

### Resource Harvester¶

krpc_SpaceCenter_ResourceHarvester_t

A resource harvester (drill). Obtained by calling krpc_SpaceCenter_Part_ResourceHarvester().

krpc_error_t krpc_SpaceCenter_ResourceHarvester_Part(krpc_connection_t connection, krpc_SpaceCenter_Part_t * result)

The part object for this harvester.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_ResourceHarvester_State(krpc_connection_t connection, krpc_SpaceCenter_ResourceHarvesterState_t * result)

The state of the harvester.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_ResourceHarvester_Deployed(krpc_connection_t connection, bool * result)
void krpc_SpaceCenter_ResourceHarvester_set_Deployed(bool value)

Whether the harvester is deployed.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_ResourceHarvester_Active(krpc_connection_t connection, bool * result)
void krpc_SpaceCenter_ResourceHarvester_set_Active(bool value)

Whether the harvester is actively drilling.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_ResourceHarvester_ExtractionRate(krpc_connection_t connection, float * result)

The rate at which the drill is extracting ore, in units per second.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_ResourceHarvester_ThermalEfficiency(krpc_connection_t connection, float * result)

The thermal efficiency of the drill, as a percentage of its maximum.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_ResourceHarvester_CoreTemperature(krpc_connection_t connection, float * result)

The core temperature of the drill, in Kelvin.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_ResourceHarvester_OptimumCoreTemperature(krpc_connection_t connection, float * result)

The core temperature at which the drill will operate with peak efficiency, in Kelvin.

Game Scenes: All
krpc_SpaceCenter_ResourceHarvesterState_t

The state of a resource harvester. See krpc_SpaceCenter_ResourceHarvester_State().

KRPC_SPACECENTER_RESOURCEHARVESTERSTATE_DEPLOYING

The drill is deploying.

KRPC_SPACECENTER_RESOURCEHARVESTERSTATE_DEPLOYED

The drill is deployed and ready.

KRPC_SPACECENTER_RESOURCEHARVESTERSTATE_RETRACTING

The drill is retracting.

KRPC_SPACECENTER_RESOURCEHARVESTERSTATE_RETRACTED

The drill is retracted.

KRPC_SPACECENTER_RESOURCEHARVESTERSTATE_ACTIVE

The drill is running.

### Reaction Wheel¶

krpc_SpaceCenter_ReactionWheel_t

A reaction wheel. Obtained by calling krpc_SpaceCenter_Part_ReactionWheel().

krpc_error_t krpc_SpaceCenter_ReactionWheel_Part(krpc_connection_t connection, krpc_SpaceCenter_Part_t * result)

The part object for this reaction wheel.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_ReactionWheel_Active(krpc_connection_t connection, bool * result)
void krpc_SpaceCenter_ReactionWheel_set_Active(bool value)

Whether the reaction wheel is active.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_ReactionWheel_Broken(krpc_connection_t connection, bool * result)

Whether the reaction wheel is broken.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_ReactionWheel_AvailableTorque(krpc_connection_t connection, krpc_tuple_tuple_double_double_double_tuple_double_double_double_t * result)

The available torque, in Newton meters, that can be produced by this reaction wheel, in the positive and negative pitch, roll and yaw axes of the vessel. These axes correspond to the coordinate axes of the krpc_SpaceCenter_Vessel_ReferenceFrame(). Returns zero if the reaction wheel is inactive or broken.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_ReactionWheel_MaxTorque(krpc_connection_t connection, krpc_tuple_tuple_double_double_double_tuple_double_double_double_t * result)

The maximum torque, in Newton meters, that can be produced by this reaction wheel, when it is active, in the positive and negative pitch, roll and yaw axes of the vessel. These axes correspond to the coordinate axes of the krpc_SpaceCenter_Vessel_ReferenceFrame().

Game Scenes: All

### RCS¶

krpc_SpaceCenter_RCS_t

An RCS block or thruster. Obtained by calling krpc_SpaceCenter_Part_RCS().

krpc_error_t krpc_SpaceCenter_RCS_Part(krpc_connection_t connection, krpc_SpaceCenter_Part_t * result)

The part object for this RCS.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_RCS_Active(krpc_connection_t connection, bool * result)

Whether the RCS thrusters are active. An RCS thruster is inactive if the RCS action group is disabled (krpc_SpaceCenter_Control_RCS()), the RCS thruster itself is not enabled (krpc_SpaceCenter_RCS_Enabled()) or it is covered by a fairing (krpc_SpaceCenter_Part_Shielded()).

Game Scenes: All
krpc_error_t krpc_SpaceCenter_RCS_Enabled(krpc_connection_t connection, bool * result)
void krpc_SpaceCenter_RCS_set_Enabled(bool value)

Whether the RCS thrusters are enabled.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_RCS_PitchEnabled(krpc_connection_t connection, bool * result)
void krpc_SpaceCenter_RCS_set_PitchEnabled(bool value)

Whether the RCS thruster will fire when pitch control input is given.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_RCS_YawEnabled(krpc_connection_t connection, bool * result)
void krpc_SpaceCenter_RCS_set_YawEnabled(bool value)

Whether the RCS thruster will fire when yaw control input is given.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_RCS_RollEnabled(krpc_connection_t connection, bool * result)
void krpc_SpaceCenter_RCS_set_RollEnabled(bool value)

Whether the RCS thruster will fire when roll control input is given.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_RCS_ForwardEnabled(krpc_connection_t connection, bool * result)
void krpc_SpaceCenter_RCS_set_ForwardEnabled(bool value)

Whether the RCS thruster will fire when pitch control input is given.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_RCS_UpEnabled(krpc_connection_t connection, bool * result)
void krpc_SpaceCenter_RCS_set_UpEnabled(bool value)

Whether the RCS thruster will fire when yaw control input is given.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_RCS_RightEnabled(krpc_connection_t connection, bool * result)
void krpc_SpaceCenter_RCS_set_RightEnabled(bool value)

Whether the RCS thruster will fire when roll control input is given.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_RCS_AvailableTorque(krpc_connection_t connection, krpc_tuple_tuple_double_double_double_tuple_double_double_double_t * result)

The available torque, in Newton meters, that can be produced by this RCS, in the positive and negative pitch, roll and yaw axes of the vessel. These axes correspond to the coordinate axes of the krpc_SpaceCenter_Vessel_ReferenceFrame(). Returns zero if RCS is disable.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_RCS_MaxThrust(krpc_connection_t connection, float * result)

The maximum amount of thrust that can be produced by the RCS thrusters when active, in Newtons.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_RCS_MaxVacuumThrust(krpc_connection_t connection, float * result)

The maximum amount of thrust that can be produced by the RCS thrusters when active in a vacuum, in Newtons.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_RCS_Thrusters(krpc_connection_t connection, krpc_list_object_t * result)

A list of thrusters, one of each nozzel in the RCS part.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_RCS_SpecificImpulse(krpc_connection_t connection, float * result)

The current specific impulse of the RCS, in seconds. Returns zero if the RCS is not active.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_RCS_VacuumSpecificImpulse(krpc_connection_t connection, float * result)

The vacuum specific impulse of the RCS, in seconds.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_RCS_KerbinSeaLevelSpecificImpulse(krpc_connection_t connection, float * result)

The specific impulse of the RCS at sea level on Kerbin, in seconds.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_RCS_Propellants(krpc_connection_t connection, krpc_list_string_t * result)

The names of resources that the RCS consumes.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_RCS_PropellantRatios(krpc_connection_t connection, krpc_dictionary_string_float_t * result)

The ratios of resources that the RCS consumes. A dictionary mapping resource names to the ratios at which they are consumed by the RCS.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_RCS_HasFuel(krpc_connection_t connection, bool * result)

Whether the RCS has fuel available.

Game Scenes: All

Note

The RCS thruster must be activated for this property to update correctly.

### Sensor¶

krpc_SpaceCenter_Sensor_t

A sensor, such as a thermometer. Obtained by calling krpc_SpaceCenter_Part_Sensor().

krpc_error_t krpc_SpaceCenter_Sensor_Part(krpc_connection_t connection, krpc_SpaceCenter_Part_t * result)

The part object for this sensor.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Sensor_Active(krpc_connection_t connection, bool * result)
void krpc_SpaceCenter_Sensor_set_Active(bool value)

Whether the sensor is active.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Sensor_Value(krpc_connection_t connection, char * * result)

The current value of the sensor.

Game Scenes: All

### Solar Panel¶

krpc_SpaceCenter_SolarPanel_t

A solar panel. Obtained by calling krpc_SpaceCenter_Part_SolarPanel().

krpc_error_t krpc_SpaceCenter_SolarPanel_Part(krpc_connection_t connection, krpc_SpaceCenter_Part_t * result)

The part object for this solar panel.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_SolarPanel_Deployable(krpc_connection_t connection, bool * result)

Whether the solar panel is deployable.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_SolarPanel_Deployed(krpc_connection_t connection, bool * result)
void krpc_SpaceCenter_SolarPanel_set_Deployed(bool value)

Whether the solar panel is extended.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_SolarPanel_State(krpc_connection_t connection, krpc_SpaceCenter_SolarPanelState_t * result)

The current state of the solar panel.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_SolarPanel_EnergyFlow(krpc_connection_t connection, float * result)

The current amount of energy being generated by the solar panel, in units of charge per second.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_SolarPanel_SunExposure(krpc_connection_t connection, float * result)

The current amount of sunlight that is incident on the solar panel, as a percentage. A value between 0 and 1.

Game Scenes: All
krpc_SpaceCenter_SolarPanelState_t

The state of a solar panel. See krpc_SpaceCenter_SolarPanel_State().

KRPC_SPACECENTER_SOLARPANELSTATE_EXTENDED

Solar panel is fully extended.

KRPC_SPACECENTER_SOLARPANELSTATE_RETRACTED

Solar panel is fully retracted.

KRPC_SPACECENTER_SOLARPANELSTATE_EXTENDING

Solar panel is being extended.

KRPC_SPACECENTER_SOLARPANELSTATE_RETRACTING

Solar panel is being retracted.

KRPC_SPACECENTER_SOLARPANELSTATE_BROKEN

Solar panel is broken.

### Thruster¶

krpc_SpaceCenter_Thruster_t

The component of an krpc_SpaceCenter_Engine_t or krpc_SpaceCenter_RCS_t part that generates thrust. Can obtained by calling krpc_SpaceCenter_Engine_Thrusters() or krpc_SpaceCenter_RCS_Thrusters().

Note

Engines can consist of multiple thrusters. For example, the S3 KS-25x4 “Mammoth” has four rocket nozzels, and so consists of four thrusters.

krpc_error_t krpc_SpaceCenter_Thruster_Part(krpc_connection_t connection, krpc_SpaceCenter_Part_t * result)

The krpc_SpaceCenter_Part_t that contains this thruster.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Thruster_ThrustPosition(krpc_connection_t connection, krpc_tuple_double_double_double_t * result, krpc_SpaceCenter_ReferenceFrame_t referenceFrame)

The position at which the thruster generates thrust, in the given reference frame. For gimballed engines, this takes into account the current rotation of the gimbal.

Parameters: referenceFrame – The reference frame that the returned position vector is in. The position as a vector. All
krpc_error_t krpc_SpaceCenter_Thruster_ThrustDirection(krpc_connection_t connection, krpc_tuple_double_double_double_t * result, krpc_SpaceCenter_ReferenceFrame_t referenceFrame)

The direction of the force generated by the thruster, in the given reference frame. This is opposite to the direction in which the thruster expels propellant. For gimballed engines, this takes into account the current rotation of the gimbal.

Parameters: referenceFrame – The reference frame that the returned direction is in. The direction as a unit vector. All
krpc_error_t krpc_SpaceCenter_Thruster_ThrustReferenceFrame(krpc_connection_t connection, krpc_SpaceCenter_ReferenceFrame_t * result)

A reference frame that is fixed relative to the thruster and orientated with its thrust direction (krpc_SpaceCenter_Thruster_ThrustDirection()). For gimballed engines, this takes into account the current rotation of the gimbal.

• The origin is at the position of thrust for this thruster (krpc_SpaceCenter_Thruster_ThrustPosition()).
• The axes rotate with the thrust direction. This is the direction in which the thruster expels propellant, including any gimballing.
• The y-axis points along the thrust direction.
• The x-axis and z-axis are perpendicular to the thrust direction.
Game Scenes: All
krpc_error_t krpc_SpaceCenter_Thruster_Gimballed(krpc_connection_t connection, bool * result)

Whether the thruster is gimballed.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Thruster_GimbalPosition(krpc_connection_t connection, krpc_tuple_double_double_double_t * result, krpc_SpaceCenter_ReferenceFrame_t referenceFrame)

Position around which the gimbal pivots.

Parameters: referenceFrame – The reference frame that the returned position vector is in. The position as a vector. All
krpc_error_t krpc_SpaceCenter_Thruster_GimbalAngle(krpc_connection_t connection, krpc_tuple_double_double_double_t * result)

The current gimbal angle in the pitch, roll and yaw axes, in degrees.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Thruster_InitialThrustPosition(krpc_connection_t connection, krpc_tuple_double_double_double_t * result, krpc_SpaceCenter_ReferenceFrame_t referenceFrame)

The position at which the thruster generates thrust, when the engine is in its initial position (no gimballing), in the given reference frame.

Parameters: referenceFrame – The reference frame that the returned position vector is in. The position as a vector. All

Note

This position can move when the gimbal rotates. This is because the thrust position and gimbal position are not necessarily the same.

krpc_error_t krpc_SpaceCenter_Thruster_InitialThrustDirection(krpc_connection_t connection, krpc_tuple_double_double_double_t * result, krpc_SpaceCenter_ReferenceFrame_t referenceFrame)

The direction of the force generated by the thruster, when the engine is in its initial position (no gimballing), in the given reference frame. This is opposite to the direction in which the thruster expels propellant.

Parameters: referenceFrame – The reference frame that the returned direction is in. The direction as a unit vector. All

### Wheel¶

krpc_SpaceCenter_Wheel_t

A wheel. Includes landing gear and rover wheels. Obtained by calling krpc_SpaceCenter_Part_Wheel(). Can be used to control the motors, steering and deployment of wheels, among other things.

krpc_error_t krpc_SpaceCenter_Wheel_Part(krpc_connection_t connection, krpc_SpaceCenter_Part_t * result)

The part object for this wheel.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Wheel_State(krpc_connection_t connection, krpc_SpaceCenter_WheelState_t * result)

The current state of the wheel.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Wheel_Radius(krpc_connection_t connection, float * result)

Radius of the wheel, in meters.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Wheel_Grounded(krpc_connection_t connection, bool * result)

Whether the wheel is touching the ground.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Wheel_HasBrakes(krpc_connection_t connection, bool * result)

Whether the wheel has brakes.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Wheel_Brakes(krpc_connection_t connection, float * result)
void krpc_SpaceCenter_Wheel_set_Brakes(float value)

The braking force, as a percentage of maximum, when the brakes are applied.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Wheel_AutoFrictionControl(krpc_connection_t connection, bool * result)
void krpc_SpaceCenter_Wheel_set_AutoFrictionControl(bool value)

Whether automatic friction control is enabled.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Wheel_ManualFrictionControl(krpc_connection_t connection, float * result)
void krpc_SpaceCenter_Wheel_set_ManualFrictionControl(float value)

Manual friction control value. Only has an effect if automatic friction control is disabled. A value between 0 and 5 inclusive.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Wheel_Deployable(krpc_connection_t connection, bool * result)

Whether the wheel is deployable.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Wheel_Deployed(krpc_connection_t connection, bool * result)
void krpc_SpaceCenter_Wheel_set_Deployed(bool value)

Whether the wheel is deployed.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Wheel_Powered(krpc_connection_t connection, bool * result)

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Wheel_MotorEnabled(krpc_connection_t connection, bool * result)
void krpc_SpaceCenter_Wheel_set_MotorEnabled(bool value)

Whether the motor is enabled.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Wheel_MotorInverted(krpc_connection_t connection, bool * result)
void krpc_SpaceCenter_Wheel_set_MotorInverted(bool value)

Whether the direction of the motor is inverted.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Wheel_MotorState(krpc_connection_t connection, krpc_SpaceCenter_MotorState_t * result)

Whether the direction of the motor is inverted.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Wheel_MotorOutput(krpc_connection_t connection, float * result)

The output of the motor. This is the torque currently being generated, in Newton meters.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Wheel_TractionControlEnabled(krpc_connection_t connection, bool * result)
void krpc_SpaceCenter_Wheel_set_TractionControlEnabled(bool value)

Whether automatic traction control is enabled. A wheel only has traction control if it is powered.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Wheel_TractionControl(krpc_connection_t connection, float * result)
void krpc_SpaceCenter_Wheel_set_TractionControl(float value)

Setting for the traction control. Only takes effect if the wheel has automatic traction control enabled. A value between 0 and 5 inclusive.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Wheel_DriveLimiter(krpc_connection_t connection, float * result)
void krpc_SpaceCenter_Wheel_set_DriveLimiter(float value)

Manual setting for the motor limiter. Only takes effect if the wheel has automatic traction control disabled. A value between 0 and 100 inclusive.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Wheel_Steerable(krpc_connection_t connection, bool * result)

Whether the wheel has steering.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Wheel_SteeringEnabled(krpc_connection_t connection, bool * result)
void krpc_SpaceCenter_Wheel_set_SteeringEnabled(bool value)

Whether the wheel steering is enabled.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Wheel_SteeringInverted(krpc_connection_t connection, bool * result)
void krpc_SpaceCenter_Wheel_set_SteeringInverted(bool value)

Whether the wheel steering is inverted.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Wheel_HasSuspension(krpc_connection_t connection, bool * result)

Whether the wheel has suspension.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Wheel_SuspensionSpringStrength(krpc_connection_t connection, float * result)

Suspension spring strength, as set in the editor.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Wheel_SuspensionDamperStrength(krpc_connection_t connection, float * result)

Suspension damper strength, as set in the editor.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Wheel_Broken(krpc_connection_t connection, bool * result)

Whether the wheel is broken.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Wheel_Repairable(krpc_connection_t connection, bool * result)

Whether the wheel is repairable.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Wheel_Stress(krpc_connection_t connection, float * result)

Current stress on the wheel.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Wheel_StressTolerance(krpc_connection_t connection, float * result)

Stress tolerance of the wheel.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Wheel_StressPercentage(krpc_connection_t connection, float * result)

Current stress on the wheel as a percentage of its stress tolerance.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Wheel_Deflection(krpc_connection_t connection, float * result)

Current deflection of the wheel.

Game Scenes: All
krpc_error_t krpc_SpaceCenter_Wheel_Slip(krpc_connection_t connection, float * result)

Current slip of the wheel.

Game Scenes: All
krpc_SpaceCenter_WheelState_t

The state of a wheel. See krpc_SpaceCenter_Wheel_State().

KRPC_SPACECENTER_WHEELSTATE_DEPLOYED

Wheel is fully deployed.

KRPC_SPACECENTER_WHEELSTATE_RETRACTED

Wheel is fully retracted.

KRPC_SPACECENTER_WHEELSTATE_DEPLOYING

Wheel is being deployed.

KRPC_SPACECENTER_WHEELSTATE_RETRACTING

Wheel is being retracted.

KRPC_SPACECENTER_WHEELSTATE_BROKEN

Wheel is broken.

krpc_SpaceCenter_MotorState_t

The state of the motor on a powered wheel. See krpc_SpaceCenter_Wheel_MotorState().

KRPC_SPACECENTER_MOTORSTATE_IDLE

The motor is idle.

KRPC_SPACECENTER_MOTORSTATE_RUNNING

The motor is running.

KRPC_SPACECENTER_MOTORSTATE_DISABLED

The motor is disabled.

KRPC_SPACECENTER_MOTORSTATE_INOPERABLE

The motor is inoperable.

KRPC_SPACECENTER_MOTORSTATE_NOTENOUGHRESOURCES

The motor does not have enough resources to run.

## Trees of Parts¶

Vessels in KSP are comprised of a number of parts, connected to one another in a tree structure. An example vessel is shown in Figure 1, and the corresponding tree of parts in Figure 2. The craft file for this example can also be downloaded here.

Figure 1 – Example parts making up a vessel.

Figure 2 – Tree of parts for the vessel in Figure 1. Arrows point from the parent part to the child part.

### Traversing the Tree¶

The tree of parts can be traversed using the attributes krpc_SpaceCenter_Parts_Root(), krpc_SpaceCenter_Part_Parent() and krpc_SpaceCenter_Part_Children().

The root of the tree is the same as the vessels root part (part number 1 in the example above) and can be obtained by calling krpc_SpaceCenter_Parts_Root(). A parts children can be obtained by calling krpc_SpaceCenter_Part_Children(). If the part does not have any children, krpc_SpaceCenter_Part_Children() returns an empty list. A parts parent can be obtained by calling krpc_SpaceCenter_Part_Parent(). If the part does not have a parent (as is the case for the root part), krpc_SpaceCenter_Part_Parent() returns nullptr.

The following Cnano example uses these attributes to perform a depth-first traversal over all of the parts in a vessel:

#include <krpc_cnano.h>
#include <krpc_cnano/services/space_center.h>

int main() {
krpc_connection_t conn;
krpc_open(&conn, "COM0");
krpc_connect(conn, "");
krpc_SpaceCenter_Vessel_t vessel;
krpc_SpaceCenter_ActiveVessel(conn, &vessel);

krpc_SpaceCenter_Parts_t parts;
krpc_SpaceCenter_Vessel_Parts(conn, &parts, vessel);
krpc_SpaceCenter_Part_t root;
krpc_SpaceCenter_Parts_Root(conn, &root, parts);

typedef struct {
krpc_SpaceCenter_Part_t part;
int depth;
} StackEntry;
StackEntry stack[256];
int stackPtr = 0;
stack[stackPtr].part = root;
stack[stackPtr].depth = 0;

while (stackPtr >= 0) {
krpc_SpaceCenter_Part_t part = stack[stackPtr].part;
int depth = stack[stackPtr].depth;
stackPtr--;  // Pop the stack
char * title = NULL;
krpc_SpaceCenter_Part_Title(conn, &title, part);
for (int i = 0; i < depth; i++)
printf(" ");
printf("%s\n", title);

krpc_list_object_t children = KRPC_NULL_LIST;
krpc_SpaceCenter_Part_Children(conn, &children, part);
for (size_t i = 0; i < children.size; i++) {
// Push onto the stack
stackPtr++;
stack[stackPtr].part = children.items[i];
stack[stackPtr].depth = depth+1;
}
}
}


When this code is execute using the craft file for the example vessel pictured above, the following is printed out:

Command Pod Mk1
TR-18A Stack Decoupler
FL-T400 Fuel Tank
LV-909 Liquid Fuel Engine
TR-18A Stack Decoupler
FL-T800 Fuel Tank
LV-909 Liquid Fuel Engine
FL-T400 Fuel Tank
TT18-A Launch Stability Enhancer
FTX-2 External Fuel Duct
LV-909 Liquid Fuel Engine
Aerodynamic Nose Cone
FL-T400 Fuel Tank
TT18-A Launch Stability Enhancer
FTX-2 External Fuel Duct
LV-909 Liquid Fuel Engine
Aerodynamic Nose Cone
LT-1 Landing Struts
LT-1 Landing Struts
Mk16 Parachute


### Attachment Modes¶

Parts can be attached to other parts either radially (on the side of the parent part) or axially (on the end of the parent part, to form a stack).

For example, in the vessel pictured above, the parachute (part 2) is axially connected to its parent (the command pod – part 1), and the landing leg (part 5) is radially connected to its parent (the fuel tank – part 4).

The root part of a vessel (for example the command pod – part 1) does not have a parent part, so does not have an attachment mode. However, the part is consider to be axially attached to nothing.

The following Cnano example does a depth-first traversal as before, but also prints out the attachment mode used by the part:

#include <krpc_cnano.h>
#include <krpc_cnano/services/space_center.h>

int main() {
krpc_connection_t conn;
krpc_open(&conn, "COM0");
krpc_connect(conn, "InfernalRobotics Example");

krpc_SpaceCenter_Vessel_t vessel;
krpc_SpaceCenter_ActiveVessel(conn, &vessel);

krpc_SpaceCenter_Parts_t parts;
krpc_SpaceCenter_Vessel_Parts(conn, &parts, vessel);
krpc_SpaceCenter_Part_t root;
krpc_SpaceCenter_Parts_Root(conn, &root, parts);

typedef struct {
krpc_SpaceCenter_Part_t part;
int depth;
} StackEntry;
StackEntry stack[256];
int stackPtr = 0;
stack[stackPtr].part = root;
stack[stackPtr].depth = 0;

while (stackPtr >= 0) {
krpc_SpaceCenter_Part_t part = stack[stackPtr].part;
int depth = stack[stackPtr].depth;
stackPtr--;  // Pop the stack
bool axially_attached;
krpc_SpaceCenter_Part_AxiallyAttached(conn, &axially_attached, part);
const char * attach_mode = axially_attached ? "axial" : "radial";
char * title = NULL;
krpc_SpaceCenter_Part_Title(conn, &title, part);
for (int i = 0; i < depth; i++)
printf(" ");
printf("%s - %s\n", title, attach_mode);

krpc_list_object_t children = KRPC_NULL_LIST;
krpc_SpaceCenter_Part_Children(conn, &children, part);
for (size_t i = 0; i < children.size; i++) {
// Push onto the stack
stackPtr++;
stack[stackPtr].part = children.items[i];
stack[stackPtr].depth = depth+1;
}
}
}


When this code is execute using the craft file for the example vessel pictured above, the following is printed out:

Command Pod Mk1 - axial
TR-18A Stack Decoupler - axial
FL-T400 Fuel Tank - axial
LV-909 Liquid Fuel Engine - axial
TR-18A Stack Decoupler - axial
FL-T800 Fuel Tank - axial
LV-909 Liquid Fuel Engine - axial
TT18-A Launch Stability Enhancer - radial
FTX-2 External Fuel Duct - radial
LV-909 Liquid Fuel Engine - axial
Aerodynamic Nose Cone - axial
TT18-A Launch Stability Enhancer - radial
FTX-2 External Fuel Duct - radial
LV-909 Liquid Fuel Engine - axial
Aerodynamic Nose Cone - axial
Mk16 Parachute - axial


## Fuel Lines¶

Figure 5 – Fuel lines from the example in Figure 1. Fuel flows from the parts highlighted in green, into the part highlighted in blue.

Figure 4 – A subset of the parts tree from Figure 2 above.

Fuel lines are considered parts, and are included in the parts tree (for example, as pictured in Figure 4). However, the parts tree does not contain information about which parts fuel lines connect to. The parent part of a fuel line is the part from which it will take fuel (as shown in Figure 4) however the part that it will send fuel to is not represented in the parts tree.

Figure 5 shows the fuel lines from the example vessel pictured earlier. Fuel line part 15 (in red) takes fuel from a fuel tank (part 11 – in green) and feeds it into another fuel tank (part 9 – in blue). The fuel line is therefore a child of part 11, but its connection to part 9 is not represented in the tree.

The attributes krpc_SpaceCenter_Part_FuelLinesFrom() and krpc_SpaceCenter_Part_FuelLinesTo() can be used to discover these connections. In the example in Figure 5, when krpc_SpaceCenter_Part_FuelLinesTo() is called on fuel tank part 11, it will return a list of parts containing just fuel tank part 9 (the blue part). When krpc_SpaceCenter_Part_FuelLinesFrom() is called on fuel tank part 9, it will return a list containing fuel tank parts 11 and 17 (the parts colored green).

## Staging¶

Figure 6 – Example vessel from Figure 1 with a staging sequence.

Each part has two staging numbers associated with it: the stage in which the part is activated and the stage in which the part is decoupled. These values can be obtained using krpc_SpaceCenter_Part_Stage() and krpc_SpaceCenter_Part_DecoupleStage() respectively. For parts that are not activated by staging, krpc_SpaceCenter_Part_Stage() returns -1. For parts that are never decoupled, krpc_SpaceCenter_Part_DecoupleStage() returns a value of -1.

Figure 6 shows an example staging sequence for a vessel. Figure 7 shows the stages in which each part of the vessel will be activated. Figure 8 shows the stages in which each part of the vessel will be decoupled.

Figure 7 – The stage in which each part is activated.

Figure 8 – The stage in which each part is decoupled.