Question about proper way to animate your geometry when using for collision.

If you animate some geometry and then use an Object Merge to bring this geometry inside another geo where you create your collisions (using either Collision SOP or VDB From Polygons, does this mean in essence you are recreating your collision VDBs on every frame?

Should you instead animate your collision VDB(s) AFTER they are created?

AFAIK the important thing is that your collision VDBs contain correct velocity values.