Geometry Node: Join Geometry and Curve to Mesh break random islands in the shaders. #102001

New Issue

Michael Soluyanov · 2022-10-22T23:09:33+02:00

Michael Soluyanov commented

2022-10-22 23:09:33 +02:00

User Report

System Information
Operating system: Linux-5.15.0-52-generic-x86_64-with-glibc2.35 64 Bits
Graphics card: NVIDIA GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 470.141.03

Blender Version
Broken: version: 3.4.0 Alpha, branch: master, commit date: 2022-10-15 21:11, hash: b898330c37

Short description of error
Adding Curve to mesh to the Geometry nodes node tree breaks random per island:
With Curve to meshnode:

Without:

Exact steps for others to reproduce the error
curve to mesh.blend

Edited version

Short description of error
Geometry Node: Join Geometry and Curve to Mesh break random islands in the shaders.

If, when merging geometry and a mesh from a curve, you set them in the order curve, original, then something will be damaged and the islands will not be correct.

2022-10-23 00-34-39.mp4

Short description of error
Merge the curve into a mesh and any mesh in the right order and render their islands as color.

Example file:
bug islands.blend

## User Report **System Information** Operating system: Linux-5.15.0-52-generic-x86_64-with-glibc2.35 64 Bits Graphics card: NVIDIA GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 470.141.03 **Blender Version** Broken: version: 3.4.0 Alpha, branch: master, commit date: 2022-10-15 21:11, hash: `b898330c37` **Short description of error** Adding *Curve to mesh* to the Geometry nodes node tree breaks *random per island*: With *Curve to mesh*node: ![image.png](https://archive.blender.org/developer/F13751391/image.png) Without: ![image.png](https://archive.blender.org/developer/F13751408/image.png) **Exact steps for others to reproduce the error** [curve to mesh.blend](https://archive.blender.org/developer/F13751422/curve_to_mesh.blend) --- ## Edited version **Short description of error** Geometry Node: Join Geometry and Curve to Mesh break random islands in the shaders. If, when merging geometry and a mesh from a curve, you set them in the order curve, original, then something will be damaged and the islands will not be correct. [2022-10-23 00-34-39.mp4](https://archive.blender.org/developer/F13751561/2022-10-23_00-34-39.mp4) **Short description of error** Merge the curve into a mesh and any mesh in the right order and render their islands as color. Example file: [bug islands.blend](https://archive.blender.org/developer/F13751562/bug_islands.blend)

Michael Soluyanov commented

2022-10-22 23:09:33 +02:00

Added subscriber: @crantisz

Iliya Katushenock changed title from ~~Adding Curve to mesh to the Geometry nodes node tree breaks Random per island~~ to Geometry Node: Join Geometry and Curve to Mesh break random islands in the shaders.

2022-10-22 23:41:01 +02:00

Iliya Katushenock commented

2022-10-22 23:41:01 +02:00

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

Iliya Katushenock commented

2022-10-22 23:41:27 +02:00

Added subscriber: @mod_moder

Iliya Katushenock commented

2022-10-22 23:41:27 +02:00

Hello. Thanks for reporting this.

Hans Goudey commented

2023-01-17 00:49:23 +01:00

Added subscriber: @HooglyBoogly

Hans Goudey commented

2023-01-17 00:49:23 +01:00

Thanks for the report. This is a strange artifact of the way the curve to mesh node sets the auto smooth status of its resulting mesh. Because the original cubes have flat shading, their edges are considered sharp, which makes this other bug happen: #72284
Fixing that Cycles bug or implementing #93551 would solve this. But also the way the curve to mesh node sets auto smooth should be fixed in the future, so I'll merge this report to a related one.

Thanks for the report. This is a strange artifact of the way the curve to mesh node sets the auto smooth status of its resulting mesh. Because the original cubes have flat shading, their edges are considered sharp, which makes this other bug happen: #72284 Fixing that Cycles bug or implementing #93551 would solve this. But also the way the curve to mesh node sets auto smooth should be fixed in the future, so I'll merge this report to a related one.

Hans Goudey commented

2023-01-17 00:49:43 +01:00

Closed as duplicate of #72284

Hans Goudey closed this issue

2023-01-17 00:49:43 +01:00

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Geometry Node: Join Geometry and Curve to Mesh break random islands in the shaders. #102001

User Report

Edited version