The thing used to make the 3D shots is the yiffalicious dynamic yiff engine. Or so that's how I think it's called. Just check the site. Seems to be free, supported by patreon
The VR version of Yiffilicious is pretty god damn amazing. Just imagine modern videogame engines with full phyiscs, lighting, etc. Then imagine these models in those engines. Now imagine actually being able to walk around inside those scenes with everything at full scale size and with a perfect subtle 3D effect so your brain is fooled into seeing full geometry rather than just a flat image.
You can even go into POV mode for any model in any scene to REALLY get into the action. The future is here <3