Hi
I'm working on a pool, cam looking straight down. I do a test render and caustics look great but when I render at higher res the caustics look weak. I've read that this is a known issue (differences between region renders and final) but there's no explanation as to how to remedy.
More photons? It's kind of impossible to troubleshoot as region renders look good and it takes an hour per iteration of the high res.
Using a plane for the water, with bump map. I tried both physical and legacy materials. Have disabled the media absorption. Hope I can enable.
![](https://forum.corona-renderer.com/Themes/Skm_Light_RC5/images/ip.gif)
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Specs: AMD 1950X, Aorus Gaming 7 x399, 64GB RAM, 1080ti. Win10, Max 2017, Corona 1.7.3