For quite a few years I've noticed that Maya's motion trail doesn't work for certain rig controls, most often to face controls, but I was never able to tell why. The issue is that the trail looks offset and shrunk (see example attached). Today I've noticed it happened with a very simple conveyor belt rig (attached). Is this a know limitation?
The problem aggravates because not even world matrix gets updated when queried at a different frame, i.e. cmds.getAttr(.worldMatrix[0], frame=X).
The conveyor belt attached is made of a simple geometry deformed by a wire deformer and locators with point to poly constraints to the geo. The motion trail seems to follow the locator xform without the wire deformation taken into account, when the wire envelope is set to zero it works as expected.
