Well the title kinda says it but here we go. In the properties editor under the render settings there is a “Lights Paths” section where a setting of min and max for transparency is located. My question is why this setting exists at all.
I have done some tests with images with alpha mapped to planes and distributed as a particle system to get an area for testing. With a low value like 4, I get a lot of black artifacts where the rays basicly went through 4 alpha planes and then hit the fifth and got rendered black. However if I do a couple of more tests I come to the conclusion that all artifacts are gone if I set the max and min value (why is there a min value?) to about 15. However the rendertime doesnt change if i set both values to something insane like 300.
So the only reason that I can see for this setting is if I want artifacts I can decide how much that would be. The alternative for me is to just set this to something crazy high and forget it for the rest of my life and I will never lose ether quality or rendertime when using alphas. In what scenario is this setting not good to just have at a super high value?