About the Radiance Field factorization

[markkim1115]

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Hello, this is a novel, nice work. I'm very surprised with the results and your idea.

But I have a small questions,

1. Why did you split the Radiance Field grid into density and appearance separately? Can we design a single factored grid and regress density and appearance using MLP?

2. Did you have any insight behind the using appearance vector(vector b_r in the paper)? As far as i know, original NeRF did not use additional appearance feature vector at all.

Thanks for sharing great code!