[FEATURE REQUEST] Compatibilty consideration to SH enabled renderer when exporting

[tufeixp]

When exporting, add an option to allow add padding to the file with 0's for spherical harmonics, and make ply files generated by Trellis and HumanGaussian compatible with renderer defined here: https://repo-sam.inria.fr/fungraph/3d-gaussian-splatting/

[slimbuck]

Hi @tufeixp,

Thanks for the suggestion!

TBH I would love to have a more powerful SPLAT DATA panel, where arbitrary data channels can be added to the splat.

User could then make a selection and assign arbitrary values to any channel.

This functionality would be a superset of what you're asking for and in the case of 45 spherical harmonic coefficients probably quite difficult. (Though we could easily automate that part).

Thanks again!