Render artifacts in Cycles with multi material with sss combined with glass or transparent #94844

New Issue

Daniel Westlund · 2022-01-12T10:27:31+01:00

Daniel Westlund commented

2022-01-12 10:27:31 +01:00

System Information
Operating system:
Graphics card: rtx 2080 TI
Bug_joined_object_sss_and_transparency_01.blend

Blender version 3.0 stable
Render artifacts in Cycles when rendering a multi material mesh with sss combined with glass or transparent shader. the transparent shader is shadowing the sss part of the model. this is not the case when the shaders are also separated in to two different objects.

Create two boxes assign a sss shader to one and transparent shader to the other. render in viewport. It works as supposed to. Now join the two objects in to one mesh. Render and see the "shadow" artifacts. or see attached file

**System Information** Operating system: Graphics card: rtx 2080 TI [Bug_joined_object_sss_and_transparency_01.blend](https://archive.blender.org/developer/F12802040/Bug_joined_object_sss_and_transparency_01.blend) Blender version 3.0 stable Render artifacts in Cycles when rendering a multi material mesh with sss combined with glass or transparent shader. the transparent shader is shadowing the sss part of the model. this is not the case when the shaders are also separated in to two different objects. Create two boxes assign a sss shader to one and transparent shader to the other. render in viewport. It works as supposed to. Now join the two objects in to one mesh. Render and see the "shadow" artifacts. or see attached file

Daniel Westlund commented

2022-01-12 10:27:31 +01:00

Added subscriber: @Dawe69

Alaska commented

2022-01-13 00:55:45 +01:00

Added subscriber: @Alaska

Alaska commented

2022-01-13 00:55:45 +01:00

Changed status from 'Needs Triage' to: 'Confirmed'

Alaska commented

2022-01-13 00:55:45 +01:00

I can confirm. However I'm not sure if this is a bug or a limitation of the Subsurface Scattering algorithms.

Daniel Westlund commented

2022-01-14 10:37:16 +01:00

In #94844#1287192, @Alaska wrote:
I'm not sure if this is a bug or a limitation of the Subsurface Scattering algorithms.

Yes I had the same thought but I think its a huge drawback work wise. Im not sure howe it worked in 2,9*

> In #94844#1287192, @Alaska wrote: > I'm not sure if this is a bug or a limitation of the Subsurface Scattering algorithms. Yes I had the same thought but I think its a huge drawback work wise. Im not sure howe it worked in 2,9*

Philipp Oeser removed the

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Render artifacts in Cycles with multi material with sss combined with glass or transparent #94844