That sounds like animation, requiring scripting.

If it is at all possible, using scripts, Tim or someone who's done it or knows how will hopefully answer.

It would be nice if it can be animated smoothly or by fast or slow steps.

It would be useful for animating doors opening as one approaches, or doors opening only to a certain arc to allow peering beyond (rather than using translucency or walking magically through the door).

But, some of my thoughts imply employing physics-based modeling with "collision detection", which might be possible, but not hooked/wired into the app. The Boundary Box and a couple other tools can check for overlap/minimum distance type stuff. But, it probably would be a whole different product and roadmap to do that. Besides, other companies and products specialize in that, and might obsequiously/fiendishly use patents to make it infeasible for many to try to compete.