Problem with bevel modifier #50994
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Reference: blender/blender#50994
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System Information
win7 64
Blender Version
Broken: 2.78.4
3ceb68c
Short description of error
Clamp Overlap in Bevel Modifier affects all edges instead of only those that are too close
https://gyazo.com/fe66d973e80476fbf3c3f30558d7ca39
Changed status to: 'Open'
Added subscriber: @item412
Added subscriber: @FloridaJo
Can you be more specific and write the steps you are taking?
it's my understanding that clamp works on all edges that are being beveled,
not allowing them to have overlapping collisions, BUT allowing them to be beveled.
Added subscriber: @Blendify
Please also add a blend-file.
Steps:
1.Create any mesh
2.Apply bevel modifier with clamp On
3.Move any edge close to another
If I understand wiki correctly, with "clamp overlap" weight of bevel should change only for edges that are close, not for entire mesh.
bevelmod.blend
Should probably be merged with #50819
Added subscribers: @howardt, @Sergey
@howardt, afraid another one for you. Will leave it up to you to decide whether those all the same issues or not :)
Sorry, the behavior mentioned here in this bug (#50994) is the intended behavior. The clamp that is calculated is a GLOBAL clamp for the offset amount, calculated as the minimum amount that might cause overlap (approximately -- doing it exactly is hard, and a TODO). The reason for this is so that the bevel looks uniform when done -- that is, the widths all look about the same. In some artistic contexts, it could look strange to have some edges beveled a lot and some edges beveled a little (e.g., you might want all edges of a table beveled approximately the same).
One can (usually) get the effect you want by applying two bevel modifiers with different widths, applying two separate sets of edges.
I can understand that the opposite argument could hold: one could get the effect of uniform edges by simply noting where the clamp starts to take effect and use that as the amount. However this would break backward compatibility. In fact, as a bit of history: there didn't used to be a clamp option for bevel when we first made it work for 2.5, but it turned out there were existing models where the amount had been set very large and the artist relied on clamp to make the result uniform.
Since 2.8 is allowed to break backward compatibility, we could consider changing the behavior to the way you want for 2.8, but I would want to see some consensus from artists that this is desired.
For now I am closing this bug and putting your desire into the general tracking bug for desired bevel improvements, #48583.
Changed status from 'Open' to: 'Resolved'