Noticed this when perusing the migration guide from 9.x to 10.0
VObjectTargetObserver with get/set functions. Activation is on by default.
id is now observer id.
ObjectTarget is no longer a “generic” base class for Object Targets but a dedicated type of target (3D object with feature, non-CAD like Model Target).
MotionHint has been REMOVED
I believe VObjectTargetObserver should be VuObjectTargetObserver. As seen in the next section.