[abhshkdz]

From what I understand, this is not a physics engine (at least in its current form). This is a bare metal 3D environment rendering engine particularly optimized for speed; speed being especially important for training deep reinforcement learning agents for instance.

Physics would be a layer above this; I imagine Bullet can be integrated within Habitat, but will come with significant hit on speed. These choices depend quite a bit on the task being studied.