I’m trying to figure out if bloom is an additive effect or not. It doesn’t look additive in my game. I’ve been tweaking to try to make it look right, and I’m wondering if it’s a futile effort.
As a side question, is there anywhere I can get a better “under the hood” look at the post process effects to know how they really work?
\Engine\Shaders\Private\PostProcessBloom.usf
\Engine\Shaders\Private\PostProcessFFTBloom.usf
It is not additive afaik. It uses FP16 scenecolor, then scales it by BloomLuminance, so when it “exposured”(hdr->ldr) bright areas become white.
Some variables are defined in source code, like:
\Engine\Source\Runtime\Renderer\
\Engine\Source\Runtime\RenderCore\