Can you let us know why you can’t remove the walls from the caustics calculations? This looks like an ideal situation for that very approach ![]()
@Matteosperi - are you using region rendering in your first image? If so, please note that caustics currently do not work well with region rendering. Please render a full-frame image instead.
Also, you may be interested in the newest Corona 10 daily builds - https://forum.corona-renderer.com/ Chaos Corona 10 for 3ds Max - Daily Builds Changelog
There are some caustics improvement in them.
Just keep in mind that daily builds are experimental, so always save backups of your scenes before opening them in daily builds!
