i also like the caustics on that glass… and have seen such patterns made many a time. since the unwanted caustics are reflected and not refracted, have you tried turning down/off the glass material’s reflectivity? appearance-wise, the glass is mostly refraction anyway.
I think you could make it render faster by lowering some settings:
Yaydepth really doesn’t need to be 15; 7 or 8 should be fine.
You could get away with lowering your GI depth settings.
Lowering the number of photons and photon depth from your photon lamp cuts render times, but you risk losing the quality of the caustics.
and a warning:
When using cache, you may notice that you get flickering when you do animations because the cache only calculates GI for some pixels. To fix it, lower the precision value (so it calculates GI for more pixels) or turn off cache.
I’ve notice error pixels too. sometimes ill render something and ill get a couple black pixels scattered randomly around the render.
If you use the cache for animation, you can usually set prec to at least 2 or 3 without noticing any flickering. You can also improve rendertimes by setting the shadow quality lower (.9 or so), and and turning on refinement by setting it to something like .5 or .3 to compensate for the lower shadow quality
Yupp you are right, the glas is a cylinder with subsurface-modifer and i set it smooth.
Did i made something wrong?
@Lord of the Rings Junkie and frodo2975: Thx for the tipps, but at least i have rendered about 300 frames, but before i start it again, iam going to finished this render first.
Then i’m going to try some of your suggestions.