Solidify (Complex, Constraints) - very rare glitch #109239

New Issue

Richard-Foltin · 2023-06-22T13:00:20+02:00

Richard-Foltin commented

2023-06-22 13:00:20 +02:00

System Information
Operating system: Windows-10-10.0.22621-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 1070 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 528.02

Blender Version
Broken: version: 3.5.1, branch: blender-v3.5-release, commit date: 2023-04-24 18:11, hash: e1ccd9d4a1d3
Worked: 3.1.2

behavior changed in c2e8e68b65

Short description of error
Solidify modifier creates a weird glitch at a specific vertex.

Exact steps for others to reproduce the error
I have a model with about 40000 verticies that I wanted to solidify. Everything works fine, except the surroundings of a single vertex. The topology does not seem any particular there. The model is made out of triangles, but the glitch also appears if I convert it to quads. I copied the vertex and the surrounding faces to a sperarate blender file and recorded how the glitch appears depending on moving one of the verticies:

(the glitch looks exactly the same when the vertex is part of the larger object)

Solidify Modifier Settings:
Mode: Complex
Thickness Mode: Constraints
(other settings does not affect the glitch)

**System Information** Operating system: Windows-10-10.0.22621-SP0 64 Bits Graphics card: NVIDIA GeForce GTX 1070 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 528.02 **Blender Version** Broken: version: 3.5.1, branch: blender-v3.5-release, commit date: 2023-04-24 18:11, hash: `e1ccd9d4a1d3` Worked: 3.1.2 behavior changed in c2e8e68b6517b91eb14270707d7182c1727861c4 **Short description of error** Solidify modifier creates a weird glitch at a specific vertex. **Exact steps for others to reproduce the error** I have a model with about 40000 verticies that I wanted to solidify. Everything works fine, except the surroundings of a single vertex. The topology does not seem any particular there. The model is made out of triangles, but the glitch also appears if I convert it to quads. I copied the vertex and the surrounding faces to a sperarate blender file and recorded how the glitch appears depending on moving one of the verticies: ![blender_bug.gif](/attachments/64a3830e-fb65-43e5-92a1-b59618dc241b) (the glitch looks exactly the same when the vertex is part of the larger object) Solidify Modifier Settings: Mode: Complex Thickness Mode: Constraints (other settings does not affect the glitch)

blender_bug.gif

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bug.blend

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Richard-Foltin added the

labels 2023-06-22 13:00:20 +02:00

Philipp Oeser commented

2023-06-22 13:30:23 +02:00

Can confirm the issue.

Seems like solidify does not like filling this loop:

If I apply the modifier with just the rim and fill it in editmode though that does not seem to be a problem (both beauty and non-beauty options).

Can confirm the issue. Seems like solidify does not like filling this loop: ![image](/attachments/dbb3e2fa-349c-4e03-8f91-98a65de68b86) If I apply the modifier with just the rim and fill it in editmode though that does not seem to be a problem (both beauty and non-beauty options). ![image](/attachments/75b9017d-cd90-4bcf-b45b-ee8ee922a051)

image.png

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image.png

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Philipp Oeser added

and removed

labels 2023-06-22 13:30:44 +02:00

Philipp Oeser commented

2023-06-22 13:36:38 +02:00

Interestingly, this seems to work differently in 3.1.2, so changed somewhere on the way to 3.2 (will check when that changed)

Interestingly, this seems to work differently in 3.1.2, so changed somewhere on the way to 3.2 (will check when that changed) ![image](/attachments/63e12ce2-511f-406b-a3c4-41bf909b49e1)

image.png

92 KiB

Philipp Oeser commented

2023-06-22 14:33:18 +02:00

So behavior changed in c2e8e68b65

@weasel : think there is still room for improvement here?

So behavior changed in c2e8e68b6517b91eb14270707d7182c1727861c4 @weasel : think there is still room for improvement here?

Richard-Foltin commented

2023-06-25 12:27:36 +02:00

I have found a few more instances of the bug, and collected them into a blend file. I hope it helps.

Interestingly, at the horseshoe looking model, the two sides are similar, but the glitch only appears on one side.

I have found a few more instances of the bug, and collected them into a blend file. I hope it helps. ![2023-06-25 12-23-15.png](/attachments/627e5acc-c2f3-4ed8-a7cc-ce75cb16e627) ![2023-06-25 12-22-38.png](/attachments/321a669c-0dc0-438f-a6ab-2143e1a8b664) Interestingly, at the horseshoe looking model, the two sides are similar, but the glitch only appears on one side.

bug.blend

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2023-06-25 12-22-38.png

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2023-06-25 12-23-15.png

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Henrik D. commented

2023-07-30 02:01:26 +02:00

There is definitely room for improvement, but I'm not quite sure how to improve it. I'm currently trying a few things.
When I programmed it, I made a complicated algorithm to reduce the amount of normals used as constraints. Since changing the thresholds seems to just move the errors around, I guess a different algorithm is needed.

There is definitely room for improvement, but I'm not quite sure how to improve it. I'm currently trying a few things. When I programmed it, I made a complicated algorithm to reduce the amount of normals used as constraints. Since changing the thresholds seems to just move the errors around, I guess a different algorithm is needed.

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Solidify (Complex, Constraints) - very rare glitch #109239