Mix Shader Mixing Bug #70223

New Issue

Julio Cargnin Pereira · 2019-09-25T06:13:16+02:00

2019-09-25 06:13:16 +02:00

System Information
Operating system: Windows-10-10.0.17763 64 Bits
Graphics card: GeForce RTX 2070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 419.67

Blender Version
Broken: version: 2.81 (sub 10), branch: master, commit date: 2019-09-09 20:20, hash: 3e81c1c1d5
Worked: (optional)

Short description of error
Mix Shader does not mix all the features of principled BSDF,
There are two principled BSDF shaders being mixed. The Mix Shader is being used to switch for the second shader that contains some SSS.
But, some features of the second shader seem to be lost during the mix. Like de SSS for example.

Exact steps for others to reproduce the error
Check the video or
Try it by the the following simple blend file:
2019-09-25 12-59-44.mkv
MixShaderBug.blend

**System Information** Operating system: Windows-10-10.0.17763 64 Bits Graphics card: GeForce RTX 2070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 419.67 **Blender Version** Broken: version: 2.81 (sub 10), branch: master, commit date: 2019-09-09 20:20, hash: `3e81c1c1d5` Worked: (optional) **Short description of error** Mix Shader does not mix all the features of principled BSDF, There are two principled BSDF shaders being mixed. The Mix Shader is being used to switch for the second shader that contains some SSS. But, some features of the second shader seem to be lost during the mix. Like de SSS for example. **Exact steps for others to reproduce the error** Check the video or Try it by the the following simple blend file: [2019-09-25 12-59-44.mkv](https://archive.blender.org/developer/F7774158/2019-09-25_12-59-44.mkv) [MixShaderBug.blend](https://archive.blender.org/developer/F7774157/MixShaderBug.blend)

Julio Cargnin Pereira commented

2019-09-25 06:13:16 +02:00

Added subscriber: @CosmoMidias

blender-admin commented

2019-09-25 06:13:16 +02:00

#70549 was marked as duplicate of this issue

Philipp Oeser commented

2019-09-25 11:10:10 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2019-09-25 11:10:10 +02:00

Guess this falls under this known limitation:
https://docs.blender.org/manual/en/dev/render/eevee/limitations.html#subsurface-scattering

Only one BSSRDF can produce screen space subsurface scattering.

The evaluated BSSRDF is currently arbitrarily chosen.

(also think this has been reported before, let me dig that up...)

Guess this falls under this known limitation: https://docs.blender.org/manual/en/dev/render/eevee/limitations.html#subsurface-scattering > - Only one BSSRDF can produce screen space subsurface scattering. > - The evaluated BSSRDF is currently arbitrarily chosen. (also think this has been reported before, let me dig that up...)

Philipp Oeser commented

2019-09-25 11:13:46 +02:00

same as #69029 (EEVEE doesn't correctly render two SSS materials mixed with a mask), #65446 (Mixing subsurface scattering shaders in EEVEE gives harsh (banded) result.)

Philipp Oeser commented

2019-09-25 11:14:18 +02:00

Closed as duplicate of #65446

Philipp Oeser closed this issue

2019-09-25 11:14:18 +02:00

Philipp Oeser commented

2019-10-06 09:49:32 +02:00

Added subscriber: @cheteron

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Mix Shader Mixing Bug #70223