LuxCoreRender Forums

Hi there,

I've been having a problem with some places rendered as black. If I change the angle of the camera, they disappear.
I'm using Blender 2.93.5 with Luxcore 2.6 alpha0. If I render with Luxcore 2.5 on Blender 2.92, these spots are less noticeable and they look like dark stains. Link to simplified file:
https://www.dropbox.com/s/nma9s7b79ui2z ... blend?dl=0

It was made in Marvelous Designer. Does anyone know what causing this?

Have you checked for duplicate faces?
https://wiki.luxcorerender.org/BlendLux ... nal_render

It seems to be caused by the normal map in the bump slot. The results for the cpu and gpu are different(latest blendluxcore).
I tried an older blenluxcore 2.6 version i have and the results from the cpu and gpu are the same.
Furthermore if you change in the normal map node from OpenGL to DirectX the result is better.

Thank you both for looking into the issue. I checked the duplicates and there is none. Yes, Luximage, If I lower the normal map strength, the black spots disappear but so as bump effects. I wonder why it renders differently from version to version (in my case 2.5 and 2.6 alpha0).

1) Check the camera settings. Make the area of what the camera sees as small as possible.
https://i.imgur.com/h6wyZgz.png

2) If that doesn't solve the problem, study these settings: https://i.imgur.com/4wkeDdF.png
Changing the minimum value has a noticeable effect: https://i.imgur.com/TUlKWEy.png
I've had cases where this setting helped: https://i.imgur.com/InP5Jpw.png
Careful, increasing the maximum value increases the time to prepare the scene for rendering when using the GPU

Hi Dez!, thanks for your suggestions, but they don't seem to help with my scene. Besides, every time I change the "epsilon settings", Luxcore re compiles the kernel, another wait for 5 ~ 10 minutes.

I'm running the test scene but it looks like it is working fine here:


Am I missing something ? What result do you get ?

Sorry, I decreased the Normalmap Height before saved the file.
If you increase the height, here is a result I get.

Taka wrote: ↑Wed Nov 10, 2021 4:10 pm Sorry, I decreased the Normalmap Height before saved the file.
If you increase the height, here is a result I get.

It is still working fine here even if I set the height to 20.0 but I think you have just forget to include the relevant normal map:
You included "Seamless_crease_Blur.jpg" file but not "Seamless_crease_Blur_Normal_GL.jpg".

Dade,
Thanks for your help. I re-packed the file so it should include the normal map. Could it be a problem with my gpu? With cpu rendering, it's less noticeable. I will try with different gpu at home tonight.