How do I do collision with bullet physics? I've sponza model which has about 393 subsets. Should I add this all subsets as rigidbody to bullet physics? Is it possible to add/remove rigidbodies/model from being checked from collision using bullet physics? I want to add/remove models from being checked from collision because of frustum culling. If model isn't visible, then I don't want it to be checked for collision. Also how to do collision with this many 393 subsets?
Here is how my scene looks