3 NEW WAYS TO RELIGHT GAUSSIAN SPLATS

This tutorial shows 3 new methods to relight gaussian splats, made possible in Houdini 22:

1. Labs Relight GSplats
2. Rasterize GSplats + Light
3. Rasterize GSplats + Project

This is a followup to my earlier tutorial on relighting gaussian splats in Houdini 21.

The first method involving Labs Relight GSplats node is the easiest. However the result is approximate, since it uses VEX rather than proper raytracing.

The second method uses the Rasterize GSplats node in Copernicus to turn the splats directly into a 2D image. This can be combined with the Light node to relight them in 2D.

The third method projects the splats rasterized in Copernicus directly onto a proxy mesh in camera space, allowing them to be relit in Karma.

Each of these methods are approximate. For the highest quality results, I recommend my original method using light baking.