I model a digger assembled of multiple parts, place several instances of it into the scene and animate each instance's bucket individually within the rotation constraints specified by the model.
This is the task to be performed. An everday's task and a core requirement for an animation software.
Or, construct a car and put some of this same brand and model into the scene. One should steer to the left, another one to the right, the next one's window is open and another one's trunk is open. They are all instances of the same model, just with movable parts to be animated within the limits as specified with the model.
My problem is that it's not doable in an acceptable way:
- Copying the objects the digger is made of would mean that any future change to the model would have to be done numerous times with every instance. Copies are not instances.
- The parts of group instances are frozen. The group's objects, like the bucket, are not rotatable individually.
After 15 years of trying to work with Blender, stumbling across this again and again, I'd really like to know this now.