# ReferenceFrame¶

class ReferenceFrame

Represents a reference frame for positions, rotations and velocities. Contains:

• The position of the origin.
• The directions of the x, y and z axes.
• The linear velocity of the frame.
• The angular velocity of the frame.

Note

This class does not contain any properties or methods. It is only used as a parameter to other functions.

static create_relative(reference_frame[, position = (0.0, 0.0, 0.0)][, rotation = (0.0, 0.0, 0.0, 1.0)][, velocity = (0.0, 0.0, 0.0)][, angular_velocity = (0.0, 0.0, 0.0)])

Create a relative reference frame. This is a custom reference frame whose components offset the components of a parent reference frame.

Parameters: reference_frame (ReferenceFrame) – The parent reference frame on which to base this reference frame. position (tuple) – The offset of the position of the origin, as a position vector. Defaults to $$(0, 0, 0)$$ rotation (tuple) – The rotation to apply to the parent frames rotation, as a quaternion of the form $$(x, y, z, w)$$. Defaults to $$(0, 0, 0, 1)$$ (i.e. no rotation) velocity (tuple) – The linear velocity to offset the parent frame by, as a vector pointing in the direction of travel, whose magnitude is the speed in meters per second. Defaults to $$(0, 0, 0)$$. angular_velocity (tuple) – The angular velocity to offset the parent frame by, as a vector. This vector points in the direction of the axis of rotation, and its magnitude is the speed of the rotation in radians per second. Defaults to $$(0, 0, 0)$$. ReferenceFrame All
static create_hybrid(position[, rotation = None][, velocity = None][, angular_velocity = None])

Create a hybrid reference frame. This is a custom reference frame whose components inherited from other reference frames.

Parameters: position (ReferenceFrame) – The reference frame providing the position of the origin. rotation (ReferenceFrame) – The reference frame providing the rotation of the frame. velocity (ReferenceFrame) – The reference frame providing the linear velocity of the frame. angular_velocity (ReferenceFrame) – The reference frame providing the angular velocity of the frame. ReferenceFrame All

Note

The position reference frame is required but all other reference frames are optional. If omitted, they are set to the position reference frame.