Im working on a project in which we want to export curves from Rhino (Baked from Grasshopper) to DWG format for laser cutting. In doing this I’ve been following this guide from McNeal Wiki:
But I’m still having some pretty troubling issues in exporting the curves. When I follow the guide (convert command => export R12 Natural), it is as if some vertexes in the DWG point lists have gone missing. Also some curves end up open, and if it weren’t for that (manufacturer complained about this), chances are that we wouldn’t have discovered this rather serious issue until we got the parts delivered.
The file is large (in total around 86k curves before convertion), but the problem persists when when I’m only exporting portions of the file, so size alone does not seem to be the villan here.
My workaround for now is to export as “R12 lines and arcs” instead of “R12 Natural” and then join all of the curves in AutoCAD, which seems to work but takes time.
Please help me figure out why this is happening, and how I can make sure my future DWG exports end up correct.
After exporting the curves with the same settings (R12 Natural) again, the issue with missing vertexes occured in some other curves than for the previous export (but also some similar). Also the latter export had 7 open curves and the earlier had 5. The first 5 open curves are also all open in the second export, but closed in the .3dm file.
See pictures below for problem description:
Here are my original converted Rhino-curves (lines and arcs):
Here are the same curves exported to DWG (R12 Natural):
Here are the same curves exported to DWG (Lines & Arcs):