Black Artifacts While Using Adaptive Subdivision #69534

New Issue

Enes Aydoğan · 2019-09-05T12:57:26+02:00

Enes Aydoğan commented

2019-09-05 12:57:26 +02:00

{F7718097}System Information
Operating system: Windows-10-10.0.18362 64 Bits
Graphics card: GeForce GTX 1080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 436.15

Blender Version
Broken: version: 2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash: f6cb5f5449

Short description of error
Black artifacts on edges of geometry while using adaptive subdivision. I was trying to duplicate my workflow from other 3d software. Extruding geometry from 2d curves creates extra edges on the model. And extra edges create weird shadows on displacement.

Exact steps for others to reproduce the error
Import curve from dxf file. Use extrude Object Data > Geometry. Fill mode: Both. Use subdivision and displacement.

1.blend

{[F7718097](https://archive.blender.org/developer/F7718097/bug.png)}**System Information** Operating system: Windows-10-10.0.18362 64 Bits Graphics card: GeForce GTX 1080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 436.15 **Blender Version** Broken: version: 2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash: `f6cb5f5449` **Short description of error** Black artifacts on edges of geometry while using adaptive subdivision. I was trying to duplicate my workflow from other 3d software. Extruding geometry from 2d curves creates extra edges on the model. And extra edges create weird shadows on displacement. **Exact steps for others to reproduce the error** Import curve from dxf file. Use extrude Object Data > Geometry. Fill mode: Both. Use subdivision and displacement. [1.blend](https://archive.blender.org/developer/F7718107/1.blend)

Enes Aydoğan commented

2019-09-05 12:57:26 +02:00

Added subscriber: @enesaydogan

Enes Aydoğan changed title from ~~Black Artifacts while using Adaptive Subdivision~~ to Black Artifacts While Using Adaptive Subdivision

2019-09-05 12:59:00 +02:00

Marcin Twarowski commented

2019-09-07 18:34:53 +02:00

Added subscriber: @MarcinTwarowski

Marcin Twarowski commented

2019-09-07 18:34:53 +02:00

You have long triangles in your geometry. Displacement works best when you got nice, even wire frame. You could for example try using "Remesh" modifier.

You have long triangles in your geometry. Displacement works best when you got nice, even wire frame. You could for example try using "Remesh" modifier. ![image.png](https://archive.blender.org/developer/F7721898/image.png)

Germano Cavalcante commented

2019-09-25 17:32:13 +02:00

Added subscribers: @brecht, @mano-wii

Brecht Van Lommel was assigned by Germano Cavalcante

2019-09-25 17:32:13 +02:00

Germano Cavalcante commented

2019-09-25 17:32:13 +02:00

@brecht, is this a known limitation?

Brecht Van Lommel removed their assignment 2019-09-25 17:34:05 +02:00

Mai Lavelle was assigned by Brecht Van Lommel

2019-09-25 17:34:05 +02:00

Brecht Van Lommel commented

2019-09-25 17:35:03 +02:00

I think normally adaptive subdivision should be able to handle this kind of case without creating degenerate geometry, but it needs closer investigation to see what is happening here specifically.

Mai Lavelle was unassigned by Dalai Felinto

2019-12-23 13:52:10 +01:00

Dalai Felinto commented

2019-12-23 13:52:10 +01:00

Added subscriber: @MaiLavelle

Philipp Oeser removed the

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Black Artifacts While Using Adaptive Subdivision #69534