Polyfjord shows how a custom procedural texture can make fake caustics in Blender.

Caustic light effects are notoriously expensive in render times, but there is plenty of techniques you can use to fake the effect in any DCC.

This new tutorial from Polyfjord shows how to use a custom procedural texture (starting with Voronoi) and transform it into something you can use with a spotlight to create an easy caustic effect looking like it could be underwater.

“This can be combined with a simple volumetric shader to get smooth god rays and looong render times.”