Triangle fan bevel behavior #40722

New Issue

Duarte Farrajota Ramos · 2014-06-20T03:36:16+02:00

2014-06-20 03:36:16 +02:00

System Information
Windows 7 64Bits

Blender Version
Broken: version 2.71 (sub 0), branch b'master', commit date b'2014-06-18' b'22:46', hash b'b49e6d0', b'Release'
Similar behaviour on 2.71 RC1

Short description of error
Of a triangle fan vertex the bevel/bevel modifier gives undesirable/unexpected behavior

Exact steps for others to reproduce the error
Check screenshot or attached file Bevel_TriangleFan.blend
Of a vertex where a few edges meet, making a few triangles that form a 90 degree corner the bevel modifier gives a weird effect with a few extra faces{F94833}

**System Information** Windows 7 64Bits **Blender Version** Broken: version 2.71 (sub 0), branch b'master', commit date b'2014-06-18' b'22:46', hash b'b49e6d0', b'Release' Similar behaviour on 2.71 RC1 **Short description of error** Of a triangle fan vertex the bevel/bevel modifier gives undesirable/unexpected behavior **Exact steps for others to reproduce the error** Check screenshot or attached file [Bevel_TriangleFan.blend](https://archive.blender.org/developer/F94834/Bevel_TriangleFan.blend) Of a vertex where a few edges meet, making a few triangles that form a 90 degree corner the bevel modifier gives a weird effect with a few extra faces{[F94833](https://archive.blender.org/developer/F94833/Bevel_TriangleFan.blend)} ![TriangleFan.png](https://archive.blender.org/developer/F94831/TriangleFan.png)

Duarte Farrajota Ramos commented

2014-06-20 03:36:16 +02:00

Changed status to: 'Open'

Duarte Farrajota Ramos commented

2014-06-20 03:36:16 +02:00

Added subscriber: @DuarteRamos

Bastien Montagne commented

2014-06-20 08:23:24 +02:00

Added subscriber: @mont29

Howard Trickey was assigned by Bastien Montagne

2014-06-20 08:23:38 +02:00

Howard Trickey commented

2014-06-20 14:07:45 +02:00

This is not a regression; the code is acting as intended according to choices documented in http://wiki.blender.org/index.php/User:Howardt/Bevel .
The "expected results" diagram might be gotten by some combination of the choices "don't preserve angles" and "do partial vertex bevel". I agree that in the case illustrated, the "expected results" look better.

Will have to decide whether to expose more choices to the user, or somehow recognize this as a special case, or leave as is.

This is not a regression; the code is acting as intended according to choices documented in http://wiki.blender.org/index.php/User:Howardt/Bevel . The "expected results" diagram might be gotten by some combination of the choices "don't preserve angles" and "do partial vertex bevel". I agree that in the case illustrated, the "expected results" look better. Will have to decide whether to expose more choices to the user, or somehow recognize this as a special case, or leave as is.

Duarte Farrajota Ramos commented

2014-06-20 17:47:17 +02:00

I forgot to mention this is probably not a bug per-se, just regular behavior that I thought could use some improvement.
Just to be clear, on the example screenshot the "desirable" or "expected" behavior was hand modeled.

I forgot to mention this is probably not a bug per-se, just regular behavior that I thought could use some improvement. Just to be clear, on the example screenshot the "desirable" or "expected" behavior was hand modeled.

Alexander N. commented

2014-06-21 10:48:05 +02:00

Added subscriber: @beta-tester

Alexander N. commented

2014-06-21 10:48:05 +02:00

you can dissolve the inner edges of the fan, first. ([del]-key + "Dissolve Edges")
then add the bevel to the object to get the expected result...
i think the bevel algorithm is not able to figure out, what part of the object should be handled in what way - different users, different tastes of what the user expects.

you can dissolve the inner edges of the fan, first. ([del]-key + "Dissolve Edges") then add the bevel to the object to get the expected result... i think the bevel algorithm is not able to figure out, what part of the object should be handled in what way - different users, different tastes of what the user expects. ![Bevel_TriangleFan.blend.png](https://archive.blender.org/developer/F95116/Bevel_TriangleFan.blend.png)

Duarte Farrajota Ramos commented

2014-06-22 21:13:11 +02:00

Well that workaround seems to work pretty well, thanks for the tip

Vlad Mafteiu Scai commented

2014-07-18 08:46:30 +02:00

Added subscriber: @00Ghz

Vlad Mafteiu Scai commented

2014-07-18 08:46:30 +02:00

Would love to see more options for the bevel modifier. Like those found in C4D R15 . Although that's quite a lot of work I guess.

https://www.youtube.com/watch?v=x5G_EMc0M6Q

Especially that graph part would be cool.

Would love to see more options for the bevel modifier. Like those found in C4D R15 . Although that's quite a lot of work I guess. https://www.youtube.com/watch?v=x5G_EMc0M6Q Especially that graph part would be cool.

Julian Eisel commented

2015-03-17 14:02:16 +01:00

Changed status from 'Open' to: 'Archived'

Julian Eisel closed this issue

2015-03-17 14:02:16 +01:00

Julian Eisel commented

2015-03-17 14:02:16 +01:00

Added subscribers: @howardt, @JulianEisel

Julian Eisel commented

2015-03-17 14:02:16 +01:00

Taking the liberty to close this as todo - there even is a workaround to get the desired result. @howardt, hope you're fine with that?

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Triangle fan bevel behavior #40722