Bevel creates corrupt meshes in some cases #47257

New Issue

Alexey · 2016-01-27T22:49:12+01:00

Alexey commented

2016-01-27 22:49:12 +01:00

System Information
Operating system and graphics card

Blender Version
Broken: (All)
Worked: (None)

Short description of error
I don't know how to activate this bug again, and upload file. Only in this combination we have this bug.
test.blend
open, go to rendered shading mode.
Now we will have crash(blender close).
If we have no crash - try to change normai lnfluence, color influence, switch on and off, repeat it very fast - and we will have crash.
One else file with repeate this combination(for more chance to crush)
test.blend1

**System Information** Operating system and graphics card **Blender Version** Broken: (All) Worked: (None) **Short description of error** I don't know how to activate this bug again, and upload file. Only in this combination we have this bug. [test.blend](https://archive.blender.org/developer/F277547/test.blend) open, go to rendered shading mode. Now we will have crash(blender close). If we have no crash - try to change normai lnfluence, color influence, switch on and off, repeat it very fast - and we will have crash. One else file with repeate this combination(for more chance to crush) [test.blend1](https://archive.blender.org/developer/F277548/test.blend1)

Alexey commented

2016-01-27 22:49:12 +01:00

Changed status to: 'Open'

Alexey commented

2016-01-27 22:49:12 +01:00

Added subscriber: @Inwader77

Alexey commented

2016-01-27 23:11:10 +01:00

P.S. sometimes i was go to sculpt mode, switch on Dyntopo, draw anything - and crash(without go to rendered shading mode). But i was repeat it two times only, and can not repeat it again.

Campbell Barton commented

2016-01-28 07:46:27 +01:00

Added subscriber: @ideasman42

Campbell Barton commented

2016-01-28 07:46:28 +01:00

The mesh is corrupt, but we can't fix the bug based on a corrupt blend file alone.

To fix this we need the steps to follow to create the corrupt file.

The mesh is corrupt, but we can't fix the bug based on a corrupt blend file alone. To fix this we need the steps to follow to create the corrupt file.

Campbell Barton changed title from ~~Unknown crash~~ to Corrupt mesh crashes Blender

2016-01-28 07:47:45 +01:00

Alexey commented

2016-01-28 11:24:34 +01:00

In #47257#355179, @ideasman42 wrote:
The mesh is corrupt, but we can't fix the bug based on a corrupt blend file alone.

To fix this we need the steps to follow to create the corrupt file.

Create this combination with any method. Look closely in this construction, and normal direction too.
Add bevel modifier, add material with bump map(type of texture - is not important).]
bevel_crash.blend

> In #47257#355179, @ideasman42 wrote: > The mesh is corrupt, but we can't fix the bug based on a corrupt blend file alone. > > To fix this we need the steps to follow to create the corrupt file. Create this combination with any method. Look closely in this construction, and normal direction too. Add bevel modifier, add material with bump map(type of texture - is not important).] [bevel_crash.blend](https://archive.blender.org/developer/F277910/bevel_crash.blend)

Sergey Sharybin commented

2016-02-02 10:45:39 +01:00

Added subscribers: @howardt, @Sergey

Howard Trickey was assigned by Sergey Sharybin

2016-02-02 10:45:39 +01:00

Sergey Sharybin commented

2016-02-02 10:45:39 +01:00

The file seems to have a proper mesh, however enabling bevel modifier asserts at bmesh_bevel.c:3631.

@howardt, is it something you can have a look into? :)

The file seems to have a proper mesh, however enabling bevel modifier asserts at `bmesh_bevel.c:3631`. @howardt, is it something you can have a look into? :)

Howard Trickey commented

2016-02-02 13:26:36 +01:00

Looking. Somehow the bevel has created a face with a duplicate vert and a duplicate edge.

Howard Trickey commented

2016-02-05 16:21:40 +01:00

Just updating this, now that I've investigated it some.
This turns out to expose a bug in the way I've implemented bevel:
in some places, it assumes that the faces around a vertex involved in a bevel all have consistent normal directions; this can't always be true. This shows up when reconstructing the faces that touch such vertices; and also in the calculation of the new bevel polygons.
Fixing this will take some thought and touches a number of places.
It is good that this report made me aware of these deficiencies -- thanks for the report.

Just updating this, now that I've investigated it some. This turns out to expose a bug in the way I've implemented bevel: in some places, it assumes that the faces around a vertex involved in a bevel all have consistent normal directions; this can't always be true. This shows up when reconstructing the faces that touch such vertices; and also in the calculation of the new bevel polygons. Fixing this will take some thought and touches a number of places. It is good that this report made me aware of these deficiencies -- thanks for the report.

Campbell Barton changed title from ~~Corrupt mesh crashes Blender~~ to Bevel creates corrupt meshes in some cases

2016-05-04 17:08:58 +02:00

Howard Trickey commented

2016-05-04 21:28:51 +02:00

I have a fix for this completed but it creates a number of diffs in the regression test that I need to check out. Hopefully can close this out next week.

blender-admin commented

2016-05-25 14:48:46 +02:00

This issue was referenced by 7928030eff

This issue was referenced by 7928030eff0749fec6f5eaed80d943bebb10d143

Howard Trickey commented

2016-05-25 14:56:37 +02:00

Changed status from 'Open' to: 'Resolved'

Howard Trickey closed this issue

2016-05-25 14:56:37 +02:00

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Bevel creates corrupt meshes in some cases #47257