LuxCoreRender Forums

The easiest way is probably to use an IES light. For example, at this site, you can find literally thousands from some different real-world manufacturers.
You just need to browse the library and look for one that suits your needs.

That happens to me too on Blender 2.91.2, but it works fine on Blender 2.83.12. I think it means that the Blender developers changed something with the latest API version that isn't compatible with the way drag & drop works for this addon. You can work around the issue for now, by clicking exact...

The latest LuxCore uses C++ code for rendering, by default, with the CPU (i.e. no need to use/have an OpenCL CPU device). To disable the CPU usage, you have to set the number of CPU threads to 0 by setting "native.threads.count" to 0. ... LuxCoreUI v2.4 (LuxCore demo: http://www.luxcorere...

Your cushion model also has a strange triangular look in the viewport there. Also check duplicate vertices. You can use merge by distance to remove doubles. It could possibly have broken custom split normals? If none of the other methods described here solve the issue yet, try selecting that object ...

Sorry, I'm relatively new to LuxCore. Welcome! :D I added a "Custom n, k Values" mode to the fresnel texture: But you told above that custom numbers are not exposed in BlendLuxCore. Any chance to have them exposed in Blender any soon, maybe at least in some beta version? Or do you mean yo...

Have a look in Blender to check Normals (face orientation) and UVs are correct

You can denoise the caustics pass by turning off the Pixel Filter (setting it to None). Find it under Sampling > Advanced > Filter. It's probably set to Blackman-Harris at 1.50 pixels by default. That does not work well with noise from the Metropolis sampler

If you're sure you have assigned LuxCore materials (or using Cycles material adapter), make sure you have not selected the Material Override on the View Layer panel.

The source of the problem is in having OIDN not really trained to denoise caustics, etc. I believe I have found the solution: Pixel Filter! I noticed that the pixel filter is by default in BlendLuxCore set to Blackman-Harris at 1.50 pixels. Even with 1024 light-path spp (thanks for the recent fix f...

This is LuxCore's beauty pass (DENOISED output) DuralexPicardie-01-LuxCore-denoised-pass.png This is what I get when I recombine all AOVs manually (denoised individually) DuralexPicardie-01-all-passes-recombined.png You can hopefully see that there is some highlight detail missing from the PhotonGI ...