About your volume rendering implementation

[jcliu0428]

Hi there,

Thank you for the great work! When I try to follow your code, I have a question on the raw2alpha function at https://github.com/apchenstu/mvsnerf/blob/main/renderer.py#L18, which describes the process of transforming volume density to the weights of rendering. However, in original NeRF paper, the distance between ray points should be another factor in the exponential function. In both your paper and your code, it seems that this term is gone.

I tried your original code and I found ignoring the distance does not affect the performance that much. But is there any particular reason that you ignore this term?

Thank you for your time and look forward to your reply!