problem with Project Knife and ngons #39421

Closed
opened 2014-03-26 00:46:49 +01:00 by Sanc Tuary · 9 comments

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

**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](https://archive.blender.org/developer/F82584/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
Author

Changed status to: 'Open'

Changed status to: 'Open'
Author

Added subscriber: @sanctuary

Added subscriber: @sanctuary
Campbell Barton was assigned by Bastien Montagne 2014-03-26 19:43:24 +01:00

Added subscriber: @mont29

Added subscriber: @mont29

Campbell, think this is your area?

Campbell, think this is your area?
Member

Added subscriber: @WalidShouman

Added subscriber: @WalidShouman
Member

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!

  • Select a circle's edge and click L (select linked) and delete
    (attached a pic for the duplicated circle)
    duplicates_for_knife_project.png

The question now, what should be the default behavior when we have 2 overlapping meshes to be projected on another mesh?

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! - Select a circle's edge and click L (select linked) and delete (attached a pic for the duplicated circle) ![duplicates_for_knife_project.png](https://archive.blender.org/developer/F83195/duplicates_for_knife_project.png) The question now, what should be the default behavior when we have 2 overlapping meshes to be projected on another mesh?
Author

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

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'

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.

Closing, while knife project could do a `remove doubles`, I think its better we expect correct non overlapping projection lines.
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Reference: blender/blender#39421
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