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> spherical harmonic encoded materials

This in particular has been hilarious for the exact reason you mentioned. For anybody curious, here's a paper from 2008 about this technique:

https://www.ppsloan.org/publications/StupidSH36.pdf

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Ah, so 3DGS is a Neural method?
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There is a neural method for computing 3DGS from video or a series of photographs. Rendering 3DGS uses no neural networks as far as I know.
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Its not a neural method. Its just differential rendering and backprop
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