I have done some simple tests with reflective caustics in Cycles (Blender 2.90) using the following scene consisting of one perfect mirror and one with roughness = 1. Both are fully metallic and the light source is a sun lamp shining trough two holes in a wall:
Shouldn’t the reflected light from the perfect mirror give a single spot of light on the floor? I understand that there are limitations when it comes to caustics in Cycles and that LuxCore is a better alternative for this kind of scene, just wondering why the reflected light is so diffused?
You must decrease “Direct Light”, “Indirect Light” and “Filter Glossy” values and you must use strong light and you must use high render samples like 2048, 4096 or more for Caustics.
Many thanks for your time @Acrivec testing and providing examples. Your caustics renders are really impressive, I will for sure learn more about LuxCore and try it out.
Maybe a good first project could be Chris Isaac’s “Mirror Suit”
Yep - currently the MNEE method only works with refractive caustics, however other methods such as path guiding are also being worked on which should help with reflective caustics.