Johannes Hinrichs

ok right after posting this I noticed another detail, so here's an update. part of the issue was with my "detector" setup. I was looking at matte-translucent from behind. This...

Sorry for spamming this (last one really, I will be away from this PC for 2 weeks ;) ) I realised I was still being an idiot, there were two...

ok sorry that ended up unclear. The last test scene is how I generated the comparison image (should be the same for the second post) For the remaining issue use...

The distance is chosen because I'm using a real-life lens design that is focused at infinity. So the object needs to be far. My thought right now: I'm using only...

I have played around with the matte translucent a bit. What I found is that it only interacts with a ray if the ray comes from the forward side of...

Ok, quick comment ahead cause I just noticed a new symptom: From a real world material I would expect it to scatter at entry and exit. I'm thinking like a...

Ok here is it a bit more systematic. Image below, blend-files attached Basic scene setup: Default Blender Cube scene, switch to Lux, delete all lights, create laser light, set matte-transparent...

I believe this condition is responsible: https://github.com/LuxCoreRender/LuxCore/blob/9131aa91478bedb11582f1c835477ac7a6c91dbe/src/slg/lights/spherelight.cpp#L119 It fits with a calculation on the distance and light radius where I observe this change. I'm currently trying to compile what I...

Ok now after looking closer, the condition as such is actually not calculated wrong. I was misinterpreting at first due to an approximation in it. If I just remove the...

I may have found a solution. What I did was to still do the cone sampling and subsequent shadow ray tracing, but replace the pdfw's and return value with the...