Cycles Volumetrics: block artifacts with overlapping volumes #44007

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opened 2015-03-15 19:03:40 +01:00 by Georg K · 8 comments

Georg K commented

2015-03-15 19:03:40 +01:00

System Information
Win 7 x64, Ubuntu 14.04, Radeon HD 7770

Blender Version
Broken: 2,73a, 2.74RC
Worked: -

Short description of error
Intersecting objects with Cycles Volume scatter shader will render with block artifacts (the size of the tiles) when the rendering tilesize is lower than a certain value, often 64x64 or 128x128. Could not test if it also affects GPU rendering. Have a look: Intersecting_scatterVolumes_bug.blend

Exact steps for others to reproduce the error
Create two intersecting objects with the same (or individual) Cycles Volume Scatter shader (higher density makes the artifacts more visible)
Render the image with tile size 128x128 - no artifacts
Render again with a tile size lower than 64x64, like 8x8 or 8x32 - block artifacts at intersection

The minimum tile size required for an artifact-free render is depending on the scene.
(8x32 tiles)

**System Information** Win 7 x64, Ubuntu 14.04, Radeon HD 7770 **Blender Version** Broken: 2,73a, 2.74RC Worked: - **Short description of error** Intersecting objects with Cycles Volume scatter shader will render with block artifacts (the size of the tiles) when the rendering tilesize is lower than a certain value, often 64x64 or 128x128. Could not test if it also affects GPU rendering. Have a look: [Intersecting_scatterVolumes_bug.blend](https://archive.blender.org/developer/F151803/Intersecting_scatterVolumes_bug.blend) ![Intersecting_scatterVolumes_bug.png](https://archive.blender.org/developer/F151801/Intersecting_scatterVolumes_bug.png) **Exact steps for others to reproduce the error** Create two intersecting objects with the same (or individual) Cycles Volume Scatter shader (higher density makes the artifacts more visible) Render the image with tile size 128x128 - no artifacts Render again with a tile size lower than 64x64, like 8x8 or 8x32 - block artifacts at intersection The minimum tile size required for an artifact-free render is depending on the scene. ![Cloud_artifacts_8x32_tiles.png](https://archive.blender.org/developer/F151804/Cloud_artifacts_8x32_tiles.png) (8x32 tiles)

Georg K commented

2015-03-15 19:03:40 +01:00

Author

Changed status to: 'Open'

Changed status to: 'Open'

Georg K commented

2015-03-15 19:03:40 +01:00

Author

Added subscriber: @georgK

Added subscriber: @georgK

Sergey Sharybin self-assigned this 2015-03-16 08:39:53 +01:00

Sergey Sharybin commented

2015-03-16 08:39:53 +01:00

Owner

This is very similar to #43926, not sure if it's caused by the same issue in code or not. Also reminds me alignment issue we've fixed in the past..

This is very similar to #43926, not sure if it's caused by the same issue in code or not. Also reminds me alignment issue we've fixed in the past..

blender-admin commented

2015-03-23 08:48:33 +01:00

This issue was referenced by ed7e593a4b

This issue was referenced by ed7e593a4b129e1367a7f5aa2d0e9036e5363bea

Sergey Sharybin commented

2015-03-23 09:01:13 +01:00

Owner

Changed status from 'Open' to: 'Resolved'

Changed status from 'Open' to: 'Resolved'

Sergey Sharybin closed this issue

2015-03-23 09:01:13 +01:00

Sergey Sharybin commented

2015-03-23 09:01:13 +01:00

Owner

Closed by commit ed7e593a4b.

Closed by commit ed7e593a4b.

blender-admin commented

2015-03-24 15:47:49 +01:00

This issue was referenced by 01ee21ffb9

This issue was referenced by 01ee21ffb930d1e75c8501da44b06d63b6d46704

blender-admin commented

2015-03-24 18:37:49 +01:00

This issue was referenced by blender/cycles@61abb71aa4

This issue was referenced by blender/cycles@61abb71aa48428a41a5814398396781f84134c81

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