Trying to create coloured glass/gemstones with the (amazing) Caustics branch, I keep on running into this issue:
I’m creating colour in the material by absorption, as per the NVIDIA example scene, but to get the right colour intensity I need to dial up the Opacity. However, when it gets above a certain value it just renders black.
Here are examples with Opacity set to 0.5, 0.9, 0.97:
How might we work around this issue?
(it’s the same in the 5.1 branch and the 5.2 branch, which is why I didn’t specify a version)