A Pytorch extension for your occupancy grid and volume rendering modules

[jingsenzhu]

Thank you again for your great work!

In your implementation of Permutohedral Encoding, you implement it as a Pytorch CUDA module so it's scalable and easy to migrate to other NeRF and SDF projects. However, I found that you implemented the Permuto SDF modules as pure CUDA classes requiring a lots of dependency libraries ,which I struggled in installing on my system without using a docker :( . Therefore, for code migration needs, I slightly modified your codes which removed most of the dependencies (of course, Pytorch and CUDA are still needed :) , making it into a installable Pytorch module.

If you agree, I'll release my modified codes on github. Thank you very much :D