Regression with Crease Attribute #101373

New Issue

Steffen Dünner · 2022-09-26T09:01:57+02:00

Steffen Dünner commented

2022-09-26 09:01:57 +02:00

System Information
Operating system: Linux-5.15.0-48-generic-x86_64-with-glibc2.35 64 Bits
Graphics card: NVIDIA GeForce RTX 2070 Super/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 515.65.01

Blender Version
Broken: version: 3.4.0 Alpha, branch: master, commit date: 2022-09-26 04:23, hash: 34477bbfcd
Worked: All 3.4 before https://developer.blender.org/rBa8a454287a27d408668f8adc6fe1b3aa988de1ac

Short description of error
I have a scene that showed broken geometry since a few days. I could find the commit that caused the problem

a8a454287a - Mesh: Move edge crease out of MEdge

The problem is that in this scene I used the "crease" edge attribute to selectively isolate the edges of a simple geometry and to mesh them. Crease is the only edge attribute that I can easily assign in edit mode and that I can also access in Geometry Nodes. I know that crease isn't meant for this purpose but it worked like a charm before.

Exact steps for others to reproduce the error

Download and open attached blend file
BUG_Crease_v01.blend
It contains this geometry

Basically a subdivided cube with different crease values assigned to different edges
It has a Geometry Nodes Modifier that does the same thing 3 times:
First the points are pushed outwards along their face normals to some amount, then the edge's crease value is compared to a specific value and depending on that all edges not matching this value are being deleted. The edges are converted to curves, different curve radii get assigned and finally all gets joined and meshed.
The push and delete operation gets repeated 3 times with different crease values.
In Blender versions before a8a454287a the scene looked like it should:
In master versions after this commit geometry is missing
Funny enough if I remove the "Set Position" parts where the geometry gets pushed outwards, the selection and deletion by crease value keeps working. But it looks like the "Set Position" gets rid of the crease attribute.
2022-09-26 08-59-38.mp4
I can work around this regression by assigning another GN Modifier before this one that does simply read the crease attribute and writes it to another attribute like "crease_new" and use this attribute afterwards.
All of this worked without a hitch before the commit mentioned above.

**System Information** Operating system: Linux-5.15.0-48-generic-x86_64-with-glibc2.35 64 Bits Graphics card: NVIDIA GeForce RTX 2070 Super/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 515.65.01 **Blender Version** Broken: version: 3.4.0 Alpha, branch: master, commit date: 2022-09-26 04:23, hash: `34477bbfcd` Worked: All 3.4 before https://developer.blender.org/rBa8a454287a27d408668f8adc6fe1b3aa988de1ac **Short description of error** I have a scene that showed broken geometry since a few days. I could find the commit that caused the problem a8a454287a27 - Mesh: Move edge crease out of MEdge The problem is that in this scene I used the "crease" edge attribute to selectively isolate the edges of a simple geometry and to mesh them. Crease is the only edge attribute that I can easily assign in edit mode and that I can also access in Geometry Nodes. I know that crease isn't meant for this purpose but it worked like a charm before. **Exact steps for others to reproduce the error** - Download and open attached blend file [BUG_Crease_v01.blend](https://archive.blender.org/developer/F13574166/BUG_Crease_v01.blend) - It contains this geometry ![image.png](https://archive.blender.org/developer/F13574170/image.png) Basically a subdivided cube with different crease values assigned to different edges - It has a Geometry Nodes Modifier that does the same thing 3 times: First the points are pushed outwards along their face normals to some amount, then the edge's crease value is compared to a specific value and depending on that all edges not matching this value are being deleted. The edges are converted to curves, different curve radii get assigned and finally all gets joined and meshed. The push and delete operation gets repeated 3 times with different crease values. - In Blender versions before a8a454287a27 the scene looked like it should: ![image.png](https://archive.blender.org/developer/F13574200/image.png) - In master versions after this commit geometry is missing ![image.png](https://archive.blender.org/developer/F13574206/image.png) - Funny enough if I remove the "Set Position" parts where the geometry gets pushed outwards, the selection and deletion by crease value keeps working. But it looks like the "Set Position" gets rid of the crease attribute. [2022-09-26 08-59-38.mp4](https://archive.blender.org/developer/F13574221/2022-09-26_08-59-38.mp4) - I can work around this regression by assigning another GN Modifier before this one that does simply read the crease attribute and writes it to another attribute like "crease_new" and use this attribute afterwards. - All of this worked without a hitch before the commit mentioned above.

Steffen Dünner commented

2022-09-26 09:01:57 +02:00

Added subscriber: @SteffenD