some question about optimize process

[JiatengLiu]

Hello, excellent work! I have a question regarding your paper. Why bind normal and color to the same Gaussian splats and optimize both parameters concurrently? What advantages does this approach offer? Theoretically, there are three processing methods:

a. normal and color are bound together and trained simultaneously
b. normal and color are bound together but trained separately
c. normal and color are represented by two sets of Gaussian splats

You opted for strategy a; what was the rationale behind this choice?