In this image, a mid draft curve produced by the Draft Angle Analysis command is highlighted in green. I’m pretty sure there’s some sort of glitch. Point objects are at polysrf edge quads.
Most of the draft curves created for this object worked fine, just a few of them did this.
This might be a tolerance thing. If I have this situation (and don’t like to change the file settings) I scale up by factor 10 or 100, do the extract and scale back down.
I managed to make a decent curve with some Grasshopper, but I think that this draft curve tool should be made to work properly with meshes.
If not, it would require to systematically reverse-engineer meshes to create a decent curve, which is way more work than creating the curve by hand !
The point in my rant is to say that McNeel should’nt put out lazy features like that.
If they don’t want to commit to doing a decent tool, then they should simply pull it out.
A lot of mesh tools are still like that by the way : lousy to the point of being useless.