rotate
Applies an additional rotation to this transform's current orientation and returns a new Transform with the combined rotation.
The new orientation is calculated by multiplying this transform's current orientation quaternion (this.quaternion) with the input rotation quaternion (this.quaternion * rotation). The position and scale components of the transform remain unchanged.
If you want to use the result to represent a pure rotation, it is assumed that both this.quaternion and the input rotation are unit quaternions. The product of two unit quaternions is also a unit quaternion.
Return
A new Transform instance with the updated orientation, while retaining the original position and scale.
Parameters
A Quat representing the additional rotation to apply. It should be a unit quaternion if a pure rotation is intended.