Solidify Modifier does not work definitely. #45975

Closed
opened 2015-09-01 10:02:53 +02:00 by perfection cat · 25 comments

System Information
Windows XP/SP3 32bits

Blender Version
Broken: version 2.75 (sub 4), branch b'master', commit date b'2015-08-31' b'20:03', hash b'b3f4bf8', b'Release'
Worked: 2.73a

Short description of error
Solidify Modifier does not work definitely.
Exact steps for others to reproduce the error
Solidify Modifier does not work definitely.

2.73a
screen273a.png
2.75(sub4)
{F229610}untitled.blend

**System Information** Windows XP/SP3 32bits **Blender Version** Broken: version 2.75 (sub 4), branch b'master', commit date b'2015-08-31' b'20:03', hash b'b3f4bf8', b'Release' Worked: 2.73a **Short description of error** Solidify Modifier does not work definitely. **Exact steps for others to reproduce the error** Solidify Modifier does not work definitely. 2.73a ![screen273a.png](https://archive.blender.org/developer/F229608/screen273a.png) 2.75(sub4) {[F229610](https://archive.blender.org/developer/F229610/screen2754.png)}[untitled.blend](https://archive.blender.org/developer/F229612/untitled.blend)
Author

Changed status to: 'Open'

Changed status to: 'Open'
Author

Added subscriber: @sindra1961

Added subscriber: @sindra1961

Added subscriber: @mont29

Added subscriber: @mont29

Cannot reproduce this here with latest master, everything’s OK…

Cannot reproduce this here with latest master, everything’s OK…
Author

Broken: 2.75a/2.75(Sub4)
Worked: 2.73a/2.74

Broken: 2.75a/2.75(Sub4) Worked: 2.73a/2.74

Added subscriber: @ideasman42

Added subscriber: @ideasman42

Checked with b3f4bf8 and this is working without problems. No error reports in valgrind either.

Checked with b3f4bf8 and this is working without problems. No error reports in valgrind either.

Added subscriber: @Sergey

Added subscriber: @Sergey

I can reproduce the issue on windows with 32bit builds. Happens with latest builds from buildbot and own builds with ALL feature enabled.

I can reproduce the issue on windows with 32bit builds. Happens with latest builds from buildbot and own builds with ALL feature enabled.
Author

Broken: 2.75a/2.75(Sub4)/2.75(Sub0)
Worked: 2.73a/2.74

Broken: 2.75a/2.75(Sub4)/2.75(Sub0) Worked: 2.73a/2.74
Author

Some vertex normal seems to turn over.

Some vertex normal seems to turn over.
Author

screen.png

![screen.png](https://archive.blender.org/developer/F231080/screen.png)

Changed status from 'Open' to: 'Archived'

Changed status from 'Open' to: 'Archived'
Campbell Barton self-assigned this 2015-09-08 06:52:44 +02:00

Looked into this and the problem is that the mesh has zero are faces, so calculating normals isn't guaranteed to work properly.

Also note that even when this does work, its because the normals can't be calculated, so its using a fallback normal (0, 0, 1) which just happens to work in this example. But the same mesh facing a different direction would fail.

Unfortunately with near-zero area faces results aren't well defined,
and having some threshold for face area will break some meshes with very small faces.

So archiving this.

Looked into this and the problem is that the mesh has zero are faces, so calculating normals isn't guaranteed to work properly. Also note that even when this does *work*, its because the normals can't be calculated, so its using a fallback normal `(0, 0, 1)` which just happens to work in this example. But the same mesh facing a different direction would fail. Unfortunately with near-zero area faces results aren't well defined, and having some threshold for face area will break some meshes with very small faces. So archiving this.
Author

This comment was removed by @sindra1961

*This comment was removed by @sindra1961*
Author

It becomes like this even if I do not use Fill Rim option.
In this case I think that small face is hardly generated, but in this case is your explanation applied?
screen.png

It becomes like this even if I do not use Fill Rim option. In this case I think that small face is hardly generated, but in this case is your explanation applied? ![screen.png](https://archive.blender.org/developer/F231822/screen.png)
Author

This comment was removed by @sindra1961

*This comment was removed by @sindra1961*
Author

This comment was removed by @sindra1961

*This comment was removed by @sindra1961*
Author

This comment was removed by @sindra1961

*This comment was removed by @sindra1961*
Author

@ideasman42, @Sergey:
This bug has been fixed in the previous version.
However, this bug occurred with 2.75 again.
I think that this is regression.

Broken: 2.68a/2.70/2.75a/2.75(Sub4)/2.75(Sub0)
Worked: 2.71/2.73a/2.74

2.70a
screen270a.png
2.71
screen271.png
2.75
screen275.png

@ideasman42, @Sergey: This bug has been fixed in the previous version. However, this bug occurred with 2.75 again. I think that this is regression. Broken: **2.68a/2.70**/2.75a/2.75(Sub4)/2.75(Sub0) Worked: **2.71**/2.73a/2.74 2.70a ![screen270a.png](https://archive.blender.org/developer/F232083/screen270a.png) 2.71 ![screen271.png](https://archive.blender.org/developer/F232084/screen271.png) 2.75 ![screen275.png](https://archive.blender.org/developer/F232085/screen275.png)
Author

@ideasman42, @Sergey:
It is displayed like an attached image properly when I change Geometry>Modification>Offset of the Text object.
screen.png
Is this a bug? Or is it restrictions?

@ideasman42, @Sergey: It is displayed like an attached image properly when I change Geometry>Modification>Offset of the Text object. ![screen.png](https://archive.blender.org/developer/F232115/screen.png) Is this a bug? Or is it restrictions?
Author

A result changes when I change origin of the Text object.
Does this not make a mistake of any?
screen.png
screen2.png

A result changes when I change origin of the Text object. Does this not make a mistake of any? ![screen.png](https://archive.blender.org/developer/F232120/screen.png) ![screen2.png](https://archive.blender.org/developer/F232122/screen2.png)
Author

@ideasman42:
I think that small face which you said means folded invisible face.
I think that face which does not have this size is all causes.
screen.png

@ideasman42: I think that small face which you said means folded invisible face. I think that face which does not have this size is all causes. ![screen.png](https://archive.blender.org/developer/F232126/screen.png)
Author

I'm sorry, this was not the regression.
The same phenomenon occurs in 2.71 when I change Geometry>Modification>offset of the Text object.

Broken: 2.68a/2.70/2.71/2.73a/2.74/2.75a/2.75(Sub4)/2.75(Sub0)
Worked: Unknown

I'm sorry, this was not the regression. The same phenomenon occurs in 2.71 when I change Geometry>Modification>offset of the Text object. Broken: **2.68a/2.70/2.71/2.73a/2.74/2.75a/2.75(Sub4)/2.75(Sub0)** Worked: **Unknown**

It's all totally depends on behavior of particular CPU, in some cases precision issue might accumulate a bit and then depending on sign of that precision error result might be wrong or right. While we can do some workarounds to support this particular case, there's no real solution for general case.

It's all totally depends on behavior of particular CPU, in some cases precision issue might accumulate a bit and then depending on sign of that precision error result might be wrong or right. While we can do some workarounds to support this particular case, there's no real solution for general case.
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Reference: blender/blender#45975
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