Colored outline artifacts in diffuse direct pass (Cycles) #72433

New Issue

Laurent Noel · 2019-12-13T21:37:28+01:00

Laurent Noel commented

2019-12-13 21:37:28 +01:00

System Information
Operating system: Windows-10-10.0.18362 64 Bits
Graphics card: GeForce GTX 1060 6GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 441.41

Blender Version
Broken: version: 2.81 (sub 16), branch: master, commit date: 2019-12-04 11:32, hash: f1aa4d18d4

Short description of error
When rendering a diffuse direct pass, I get strange colored borders on objects. On this exemple we have red borders left and right of the cube, cyan border on top, and noisy border on bottom:

diffuse direct pass:

combined pass:

Exact steps for others to reproduce the error
Run "Render Image" on the attached blend file.

test_diffuse_direct.blend

**System Information** Operating system: Windows-10-10.0.18362 64 Bits Graphics card: GeForce GTX 1060 6GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 441.41 **Blender Version** Broken: version: 2.81 (sub 16), branch: master, commit date: 2019-12-04 11:32, hash: `f1aa4d18d4` **Short description of error** When rendering a diffuse direct pass, I get strange colored borders on objects. On this exemple we have red borders left and right of the cube, cyan border on top, and noisy border on bottom: diffuse direct pass: ![DiffDir0001.png](https://archive.blender.org/developer/F8217443/DiffDir0001.png) combined pass: ![Beauty0001.png](https://archive.blender.org/developer/F8217448/Beauty0001.png) **Exact steps for others to reproduce the error** Run "Render Image" on the attached blend file. [test_diffuse_direct.blend](https://archive.blender.org/developer/F8217458/test_diffuse_direct.blend)

Laurent Noel commented

2019-12-13 21:37:28 +01:00

Added subscriber: @c2ba

Ilari Männistö commented

2019-12-17 08:50:01 +01:00

Added subscriber: @Lattapotta

Ilari Männistö commented

2019-12-17 08:50:01 +01:00

I can confirm.
I also noticed that the diffuse artifact changes color if you change the base color of the cube. The effect is more prominent if you set the film pixel filter size to the max 10px.

I also added another cube into the picture, without any material. Glossy dir will create some kind of edge artifact with it (I guess because it has no glossy component in the material).

I can confirm. I also noticed that the diffuse artifact changes color if you change the base color of the cube. The effect is more prominent if you set the film pixel filter size to the max 10px. *I also added another cube into the picture, without any material. Glossy dir will create some kind of edge artifact with it (I guess because it has no glossy component in the material).*

Ankit Meel commented

2020-02-18 14:28:03 +01:00

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

Brecht Van Lommel commented

2020-05-13 15:28:55 +02:00

Added subscriber: @brecht

Brecht Van Lommel commented

2020-05-13 15:28:55 +02:00

Changed status from 'Confirmed' to: 'Archived'

Brecht Van Lommel closed this issue

2020-05-13 15:28:55 +02:00

Brecht Van Lommel self-assigned this 2020-05-13 15:28:55 +02:00

Brecht Van Lommel commented

2020-05-13 15:28:55 +02:00

The diffuse direct pass is constructed so that diffuse color * diffuse direct produces the combined render result.

That leads to this kind of artifact, and I don't think it's avoidable in general unless something like Deep EXR is used, or the render passes are changed so that they no longer match the combined render result.

The diffuse direct pass is constructed so that diffuse color * diffuse direct produces the combined render result. That leads to this kind of artifact, and I don't think it's avoidable in general unless something like Deep EXR is used, or the render passes are changed so that they no longer match the combined render result.

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Colored outline artifacts in diffuse direct pass (Cycles) #72433