Solidify Modifier does not work definitely. #45975
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Reference: blender/blender#45975
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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
2.75(sub4)
{F229610}untitled.blend
Changed status to: 'Open'
Added subscriber: @sindra1961
Added subscriber: @mont29
Cannot reproduce this here with latest master, everything’s OK…
Broken: 2.75a/2.75(Sub4)
Worked: 2.73a/2.74
Added subscriber: @ideasman42
Checked with
b3f4bf8
and this is working without problems. No error reports in valgrind either.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.
Broken: 2.75a/2.75(Sub4)/2.75(Sub0)
Worked: 2.73a/2.74
Some vertex normal seems to turn over.
Changed status from 'Open' to: 'Archived'
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.
This comment was removed by @sindra1961
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?
This comment was removed by @sindra1961
This comment was removed by @sindra1961
This comment was removed by @sindra1961
@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
2.71
2.75
@ideasman42, @Sergey:
It is displayed like an attached image properly when I change Geometry>Modification>Offset of the Text object.
Is this a bug? Or is it restrictions?
A result changes when I change origin of the Text object.
Does this not make a mistake of any?
@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.
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.