I'd like to convert between screen and world coordinates in mujoco 1.5 (I'm using the mujoco-py bindings). In the old python bindings for mujoco 1.3 it is possible to do this conversion by obtaining the GL_MODELVIEW_MATRIX and GL_PROJECTION_MATRIX from python OpenGL like this and then computing the conversion manually. However in the new mujoco 1.5 bindings, python OpenGL is not used anymore and instead it seems like images are obtained directly from mujoco's internal renderer like here. Is there a way to obtain the projection matrices from mujoco directly, or is there any other way to compute this conversion? Thanks!