Feature request : sanity checks of the SDS guidance losses on pixel optimizations

[ThibaultGROUEIX]

Hi,

Awesome job on threestudio. I think it would be great to be able to run a sanity check on the SDS losses by running a very simple pixel optimization on a single image with the SDS loss. I think such an experiment would be very useful to tune the SDS parameters as well and understand their behaviour. AFAIK, they have it in the original dreamfusion paper.

Cheers, Thibault