Boolean Modifier will triangulate 2 polyspheres on union #38694
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Reference: blender/blender#38694
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System Information
Operating system and graphics card
winxp sp3
Blender Version
Broken: (example: 2.69.7
4b206af
, see splash screen)Worked: (optional)
Broken : blender-2.69-410613e-win32
Worked : blender 2.69 stable
Short description of error
Boolean modifier set to union will triangulate polysphere
Exact steps for others to reproduce the error
Based on a (as simple as possible) attached .blend file with minimum amount of steps
in Object Mode
The union zone is as expected from the new code having ngons but every other quads of the polyspheres have been triangulated.
screenshot in case i don't explain well :
http://i.imgur.com/s2RMPCm.jpg
Changed status to: 'Open'
Added subscriber: @sanctuary
The thing is: boolean only works correct with flat faces and will triangulate non-flat ones to work correct.
Previously boolean used to merge split faces back because it only worked with tris and quads. Now then it does support NGons, merging stuff back is much more difficult and would take reasonable amount of computing power.
Further, SS is not guaranteed to produce flat faces even if your mesh had only flat faces.
Will type all this specifics to release notes, so it's clear what's happening.
Added subscriber: @ThomasDinges
Changed status from 'Open' to: 'Archived'
Added some notes there http://wiki.blender.org/index.php/Dev:Ref/Release_Notes/2.70/Modeling#Boolean_Modifier
Think it might be closed now.
Added subscriber: @MadMinstrel
Previously the triangulation was confined to the immediate intersection are and so it was reasonably easy to clean up. The current behavior will sneakily triangulate quads in unrelated areas. I'd hardly call that more predictable, except in the sense that it's predictably dangerous to use. If the bug can't be resolved, the previous behavior, which was not great but at least it was manageable, should be rolled back. The new behavior is not an improvement.
However, it is puzzling to me that this is such a problem that it cannot be resolved. Judging from a quick test I can trivially (but not comfortably) perform the boolean without triangulating anything using the following manual procedure:
Surely this could be automated?
Made it so triangulation edges are being dissolved now in
9643b2e
. It works slower now, but at least no unwanted topology should happen now.Works great now, thanks Sergey :)