“Industrial Environments with Eevee” Course: Columns Turning Magenta when Mixing in Second Principled BSDF
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The problem has already been described by @chapeline here and on “Blender Stackexchange” here (but without any fitting solution for my problem). Despite exactly following Kent’s @theluthier instruction, the columns nevertheless turn magenta as soon as the second “Prinicpled BSDF” is mixed in with a “Mix Shader” node:
After muting the “Mix Shader Node”:
With just the “Principled BSDF” with the paint color beeing plugged into the “Material Output” node:
Everything fine in Cycles:
All tests run with Blender 2.92.0 and 2.93 Alpha.
Ok, I could “solve” the problem by muting one of the last three “MixRGB” nodes (mode “Overlay” and “Multiply”; see magenta frame below):
Muting one of the first two “MixRGB” nodes (mode “Mix”) doesn’t remove the magenta column shading.
File with one column only is here.
I’m also facing the same problem when opening Kent’s @theluthier file realistic-eevee-environment_lesson_14_end.blend from the course resources:
Again, muting one of the last three “MixRGB” nodes “solves” the problem:
Maybe, it’s a memory issue or some other Blender settings have to be adjusted?
@duerer you probably need a more powerful GPU
as Kent didn’t have this problem.Please have a look at the error message in Blender’s “System Console” when unmuting one of the three “MixRGB” nodes in the magenta frame below:
Note: This is just a small portion of the error message but as far as I can see, it’s a problem with the NVIDIA GPU. Complete error message is here.
@spikeyxxx @theluthier @jlampel I’ve found a solution 😀😀😀!!! Simply set the “Musgrave” texture node from 3D to 4D and you get the “pockmarks” (as Kent calls the little holes in the concrete) on your painted columns:
It came to my mind since there’s an info in the error message mentioned above in this thread: “Info: Successfully reset Musgrave Texture”. @spikeyxxx With your posting concerning “too many instructions” I first set it to 2 D which already solved the problem but didn’t create nice “pockmarks” in some areas (maybe rather a problem with the rotation values):
EDIT: “Musgrave” set to “3D” also works with type “Hetero Terrain” or “Hybrid Multifractal”:
The types “Multifractal”, “Ridged Multifractal” and the default type “fBM” don’t work on my computer.
@duerer, after a good night’s sleep, I remember Simon Thommes saying that Mix Shaders are really expensive and although a Principled Shader looks like only one Node, it is already a ‘mixing of Shaders’ under the hood (probably).
So let’s do all the masking before the Principled Shader like this:
(Sorry for not aligning my Noodles…)
Even my 10 year old Nvidia GT630 can handle this and you don’t change the material this way :
As you can see, no error message.
Another small optimization would be:
Which in general is preferred, while you can change the Treshold with a Slider that you can control in a Node Group, while the Flag in the ColorRamp cannot….
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