problem with Project Knife and ngons #39421
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Reference: blender/blender#39421
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System Information
Operating system and graphics card
winxp sp3
Blender Version
Broken: blender-2.70-c359de2-win32
Worked: never worked
Short description of error
Project Knife on a ngon face can result in very unpredictable/buggy result
Exact steps for others to reproduce the error
Based on a (as simple as possible) attached .blend file with minimum amount of steps
load the attached blend
knifeprojectbuggy15.blend
on the 3D view, you have already prepared 2 big circles that are filled with a ngon, on top of both circles, there are 6 small circles to be projected by the knife project.
if you do a knife project for the big circle on the left and the 6 little ones (in a circular pattern), it will fail
if you do a knife project for the other big circle on the right and the 6 little ones (in an aligned pattern), it will work
as shown in screenshot :
http://i.imgur.com/1Kona2o.jpg
Problem noticed in that Blenderartist thread for more information :
http://blenderartists.org/forum/showthread.php?331554-Why-does-knife-project-not-cut-properly-if-target-mesh-is-not-subdivided
Changed status to: 'Open'
Added subscriber: @sanctuary
Added subscriber: @mont29
Campbell, think this is your area?
Added subscriber: @WalidShouman
The radial pattern doesn't cut as long as there're 2 overlapping circles in the projector mesh!
As there's a duplicated circle (the one that cuts), the operator doesn't behave well except for it
Removing the duplicate fixes that!
(attached a pic for the duplicated circle)
The question now, what should be the default behavior when we have 2 overlapping meshes to be projected on another mesh?
Well spotted !
I completely forgot that a 360 spin duplicate will always lead into doubled result on the original mesh and required a w -> remove double
Changed status from 'Open' to: 'Archived'
Closing, while knife project could do a
remove doubles
, I think its better we expect correct non overlapping projection lines.