Voxelization in chainer

[tejank10]

Hi @hiroharu-kato

Really enjoyed reading the VPL paper, thanks for making the code public!
I was trying to port the code to python3 and CUDA. I am a bit doubtful about how the voxelize_sub1 should be done. For example, it is not clear to me that how on ine 14 in voxelization.py, i is used, whereas input to the function is j. Also, when it is written voxel=1 like here does it mean that i'th element of voxel array is set to 1?

Any help in this regard is highly appreciated!