LuxCoreRender Forums

The photon emission is automatically guided towards regions where the photons are useful, i.e., provide substantial variance reduction for the currently rendered image. Our method achieves better photon densities with fewer light paths I posted this because we have repeatedly encountered issues whe...

Luminance is not constant across different frames. Oh I see :( But I have another stupid idea :mrgreen: From what I see the problem is to correctly gauge the average luminance from a very short warmup run. In my experience light tracing is always way faster than eye tracing, when run on all cores i...

This looks just alright, now that it is based on LuxCore 2.2 makes it very strange that you cannot achieve similar GPU performance with the very same v2.2 LuxCoreUI and your simple scene
Sorry to be of no help, but this problem needs smarter heads than mine to solve

Maybe this can help to make light tracing more efficient? Abstract Robust and efficient rendering of complex lighting effects, such as caustics, remains a challenging task. While algorithms like vertex connection and merging can render such effects robustly, their significant overhead over a simple ...

About OCL on AMD, I used this library once and was able to use OpenCL on AMD Ryzen, not sure if it works with your machine but you can give it a chance. http://portablecl.org/ Thanks for the link, but I'm no developer and don't know how to install or build libraries :) In general CPU native renderi...

Apparently the scene is ok, it works with v2.2, v2.3 and v2.4alpha on my PC. GPU is always faster but on v2.3 less than on v2.2 and v2.4 :? Screenshot.jpg Something I noticed: opencl.cpu.use = "1" opencl.gpu.use = "1" opencl.devices.select = "11" You have your Intel CPU activated as an OCL device an...

juangea wrote: ↑

Wed May 13, 2020 9:00 am

check the situation with 2.3 or 2.4.

Agreed, and I did check with 2.4 too, same result (GPU faster than CPU with Cornell scene, though smaller difference).
But I'm curious what kind of setup could possibly slow down GPUs so much, no matter which Lux version ?

Maybe this issue again?

I'm not completely sure but on my PCs here PathCPU runs faster than PathGPU. And I have good performance GPUs. This looks strange indeed, I can't confirm this on my system, everything works as expected here. Screenshot.jpg From your screenshots I see you're using LuxCoreUI v2.2. Maybe something is ...

I have now rendered the scene with latest build and HDRI I asked to render without HDR :?: Please quote correctly: I have now rendered the scene with latest build and HDRI, sky or no backgroun d So I rendered it three times, including sun only, from which the GIF is made. Why not introduce a manual...