"Extremely Short Edges" warning when I Check a mesh

Rhino Rhino for Windows
1

I’m working on taking a closed polysurface and making a mesh for STL export for 3d printing. I’m getting this when I check the mesh:

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image919×1000 62.1 KB

What’s an “extremely short edge” and does it matter? Everything else seems to check out fine, just not sure if I should be concerned with this.

2

Hi Sky - Extremely short = 0.0001 or less. I gather this is a hard coded number not dependent on current file tolerance.
i.e. for triangles these are likely long and skinny, potentially very close to degenrate. ExtractMeshFacesByAspectRatio may find these.

-Pascal

3

FWIW I’m getting this error even when I’m speccing a minimum edge length well in excess of that - like .01 (mm in this case) - I still get that error, just sometime a few less of them.

4

Hi Sky - if you can post or send to tech@mcneel.com an example when one turns up, that would be helpful.

-Pascal