Leverage lightgaussian for better performance

[LifeIsStrange]

Lightgaussian is significantly faster than the original gaussian splatting (and btw generates scenes ten times smaller)
https://lightgaussian.github.io/

[Peamon]

Thanks, i will try this.

[Peamon]

I have not planned to integrate this directly in the plugin. But resulting point cloud without quantization step should be loadable in our viewer.

I let the issue open for information about how to optimize a ply file to be efficient in VR.