Accelerated raymarching & pruning

[kxhit]

Hi, thanks for this pure PyTorch implementation of hashgrid nerf. It helps in figuring out details at PyTorch level.

I noticed there is a todo list for faster raymarching and voxel pruning. I'm wondering if there is a plan for implementing that? Or is there any suggestions of implementing them at PyTorch level. Thanks!

[yashbhalgat]

Faster ray-marching and/or pruning have been on my TODO-list for a long time, but I haven't got a chance to look into it because of my other projects.

If you get a chance to work on this, please feel free to open a Pull Request. It would be a great addition to the current implementation.