3d print toolbox checks report false positives #51733
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Reference: blender/blender-addons#51733
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System Information
Windows 7 x64
Blender Version
Broken: 2.78c and 58a434b
Short description of error
When checking a model for 3d print, it reports a lot of overlapping and non-flat faces, although those are flat and not overlaping
Exact steps for others to reproduce the error
Open attached file, click check all, the face is detected as non-flat, even after it was flattened by the flatten operator.
bug flat non flat.blend
Changed status to: 'Open'
Added subscriber: @matali23
Added subscriber: @mont29
Problem comes from straight loops (those which both edges are aligned and form a straight line) returning normalized (0,0,1) normal instead of face's normal, as stated in BMLoop.calc_normal() doc… will check.
This issue was referenced by blender/blender@c71e160c02
Changed status from 'Open' to: 'Resolved'