3D-printing check misinterprates flat ngons as non-flat #50352

New Issue

Markus Kruse · 2017-01-01T15:51:35+01:00

Markus Kruse commented

2017-01-01 15:51:35 +01:00

Tested in 2.78a and a couple of weeks old nightly build. I don't hink it ever worked (but I'm not sure).

Sometimes when checking 3D-printing on a mesh it reports some faces as non-flat. Mostly faces with more vertices than four but I think it can happen to quads.

Steps to reproduce:

Start with the standard cube
Add a cylinder sticking out from the top of the cube
Add a boolean modifier to the cube, making a union with the cylinder
Apply the modifier
"Check all" in the 3d printing panel
Tab into edit mode and click "non-flat faces".

The two top faces of the cube should be selected to indicate an error.

They seem very flat and scaling them to 0 along the Z-axis doesn't fix it (assuming they were a tiny tiny amount non-flat).

3d-printing-non-flat.blend

Tested in 2.78a and a couple of weeks old nightly build. I don't hink it ever worked (but I'm not sure). Sometimes when checking 3D-printing on a mesh it reports some faces as non-flat. Mostly faces with more vertices than four but I think it can happen to quads. Steps to reproduce: - Start with the standard cube - Add a cylinder sticking out from the top of the cube - Add a boolean modifier to the cube, making a union with the cylinder - Apply the modifier - "Check all" in the 3d printing panel - Tab into edit mode and click "non-flat faces". # The two top faces of the cube should be selected to indicate an error. They seem very flat and scaling them to 0 along the Z-axis doesn't fix it (assuming they were a tiny tiny amount non-flat). [3d-printing-non-flat.blend](https://archive.blender.org/developer/F427347/3d-printing-non-flat.blend)

Markus Kruse commented

2017-01-01 15:51:35 +01:00

Changed status to: 'Open'

Markus Kruse commented

2017-01-01 15:51:35 +01:00

Added subscriber: @MarkusKruse

Markus Kruse changed title from ~~3D-printing check misinterprates flat ngons an non-flat~~ to 3D-printing check misinterprates flat ngons as non-flat

2017-01-02 09:01:22 +01:00

Dalai Felinto commented

2017-01-03 17:28:53 +01:00

Added subscriber: @dfelinto

Dalai Felinto commented

2017-01-03 17:28:53 +01:00

Which blender version? Did it ever worked? Please include a sample file (it saves time for other people to test it)

Philipp Oeser commented

2017-01-04 22:20:21 +01:00

Added subscriber: @lichtwerk

Philipp Oeser self-assigned this 2017-01-04 22:20:21 +01:00

Philipp Oeser commented

2017-01-04 22:20:21 +01:00

Can confirm this, will have a look...
First note: N-Panel > Mesh-Analysis doesnt color the faces in question as distorted [so C code does it 'right'], python operator seems to have the bug... (most likely unhandled flipped normals)

Can confirm this, will have a look... First note: N-Panel > Mesh-Analysis doesnt color the faces in question as distorted [so C code does it 'right'], python operator seems to have the bug... (most likely unhandled flipped normals)

Philipp Oeser commented

2017-01-04 22:39:30 +01:00

proposed fix D2448: proposed fix for #50352

proposed fix [D2448: proposed fix for #50352](https://archive.blender.org/developer/D2448)

blender-admin commented

2017-01-11 20:56:09 +01:00

This issue was referenced by blender/blender-addons@8c06e5c7d9

This issue was referenced by blender/blender-addons@8c06e5c7d98d2dea9b668bffc95606843c1746dc

Philipp Oeser commented

2017-01-11 20:59:23 +01:00

Changed status from 'Open' to: 'Resolved'

Philipp Oeser closed this issue