Solidify creating points at incorrect angles using complex option with flat option #91337

New Issue

RT · 2021-09-11T17:42:37+02:00

RT commented

2021-09-11 17:42:37 +02:00

System Information
Operating system: Linux-5.4.0-84-generic-x86_64-with-glibc2.31 64 Bits
Graphics card: Mesa DRI Intel(R) HD Graphics 4600 (HSW GT2) Intel Open Source Technology Center 4.5 (Core Profile) Mesa 21.0.3

Blender Version

Broken: version: 3.0.0 Alpha, branch: master, commit date: 2021-09-09 23:19, hash: ee3b4e8420
Also happens in 2.93.4

Short description of error
Solidify creating points at incorrect angles using complex option with flat option

Exact steps for others to reproduce the error

Animation showing the issue

[Based on the default startup or an attached .blend file (as simple as possible)]

Here's a test Blend file
solidfy_issue.blend

**System Information** Operating system: Linux-5.4.0-84-generic-x86_64-with-glibc2.31 64 Bits Graphics card: Mesa DRI Intel(R) HD Graphics 4600 (HSW GT2) Intel Open Source Technology Center 4.5 (Core Profile) Mesa 21.0.3 **Blender Version** Broken: version: 3.0.0 Alpha, branch: master, commit date: 2021-09-09 23:19, hash: `ee3b4e8420` Also happens in 2.93.4 **Short description of error** Solidify creating points at incorrect angles using complex option with flat option ![solidy_issue.png](https://archive.blender.org/developer/F10398457/solidy_issue.png) **Exact steps for others to reproduce the error** ![solidfy_1.png](https://archive.blender.org/developer/F10398456/solidfy_1.png) Animation showing the issue ![solidfy_issue.gif](https://archive.blender.org/developer/F10398459/solidfy_issue.gif) [Based on the default startup or an attached .blend file (as simple as possible)] Here's a test Blend file [solidfy_issue.blend](https://archive.blender.org/developer/F10398458/solidfy_issue.blend)

RT commented

2021-09-11 17:42:37 +02:00

Added subscriber: @Still

RT changed title from ~~Solidify creating points at incorrect angles using complex option~~ to Solidify creating points at incorrect angles using complex option with flat option

2021-09-11 17:44:45 +02:00

Pratik Borhade commented

2021-09-13 11:56:48 +02:00

Added subscriber: @PratikPB2123

Henrik D. commented

2021-09-14 11:06:50 +02:00

Added subscriber: @HDMaster84

Henrik D. commented

2021-09-14 11:06:50 +02:00

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

Henrik D. closed this issue

2021-09-14 11:06:50 +02:00

Henrik D. commented

2021-09-14 11:06:50 +02:00

Thanks for the report and the work you put into it.

I tried this and can confirm it happens, but this is a known issue.
The problem is that the vertex at the corner has only 1 adjacent face, which disables boundary fixes. The boundary fixes need a known free direction to move along, which is usually the direction of the third edge which separates the two adjacent faces.

The problem with having only one adjacent planar face is that the two adjacent boundary edges for the vertex will be aligned in the normal plane of the face. The flat boundary fix would try to make the boundary match the plane spanned by those two edges, but that is the normal plane, so it would stretch the boundary out really far or fail.

Here is a few hacks to get the result in your case:
solidfy_issue_hacks.blend
One is using non uniform scaling, and the other one is using almost duplicate vertices and a vertex group to disable thickness on the last one.

Thanks for the report and the work you put into it. I tried this and can confirm it happens, but this is a **known issue**. The problem is that the vertex at the corner has only 1 adjacent face, which disables boundary fixes. The boundary fixes need a known free direction to move along, which is usually the direction of the third edge which separates the two adjacent faces. The problem with having only one adjacent planar face is that the two adjacent boundary edges for the vertex will be aligned in the normal plane of the face. The flat boundary fix would try to make the boundary match the plane spanned by those two edges, but that is the normal plane, so it would stretch the boundary out really far or fail. Here is a few hacks to get the result in your case: [solidfy_issue_hacks.blend](https://archive.blender.org/developer/F10411433/solidfy_issue_hacks.blend) One is using non uniform scaling, and the other one is using almost duplicate vertices and a vertex group to disable thickness on the last one.

Sebastian Parborg commented

2021-09-14 11:37:41 +02:00

Changed status from 'Archived' to: 'Confirmed'

Sebastian Parborg reopened this issue

2021-09-14 11:37:41 +02:00

Philipp Oeser removed the

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Solidify creating points at incorrect angles using complex option with flat option #91337