I followed your steps exactly, below is the scheme I set up.
I went with my existing choice of Release 12 so edit scheme started off with settings as such, I clicked new and named the new scheme Release 12 Solids then as you can see I made Export surfaces SOLIDS.
Used that scheme to export my dxf and it still opens without solids into V5.
I don’t believe DXF release 12 supports solids (as it’s from, like, 1995 or something). You probably need to use something more recent, 2004 is the most recent available in V5, I would go with that. @lowell why don’t we have more recent versions like 2010?
I think that’s right about R12. I see that I need to fix the dropdown to not let you set to writing solids in R12 versions. Writing R12 files, you’ll get polyface meshes instead of ACIS solids.
The reason I haven’t added writing later versions is that I don’t think there’s anything to gain by it. So far I’ve been able to export anything I wanted to from Rhino to ver. 2004. That makes it accessible to more programs that might not read later Acad files.
If there’s a need for something later, I’d be happy to consider it.
Hi, its a solid made from various sweeps and planar fills, a complex job, then inset 2mm which tends to cause imperfections on what were tricky areas to research and sweep to rail surfaces to. I then checked for exposed edges and so on.
Its a very valuable file and I get a cold sweat just thinking about letting it outside of my PC.
OK, I wouldn’t want to be responsible for any excessive sweating.
The Acad exporter skips geometry that Rhino diagnoses as invalid.
You can get some idea about that by running Check on your solid. I’m not sure that’s a conclusive test though.
If you come across something you’d like to post (or send privately) I’ll be happy to take a look.
If you have a closed, solid, polysurface (“What” command or Details button on Properties panel), then that object is appropriate for solid export to the DWG/DWG file format.
If your polysurface is not closed, then it’s not valid for solid export.
Making sure it is valid is up to you. Rhino is a surface modeler that can make solids. It has no requirement to do so. That’s up to you and your modeling expertise.
It should be. ACIS supports open structures as well as closed ones. The object just needs to be VALID, not necessarily closed. Try exporting an open polysurface as Dwg/2004/solids and re-import into Rhino. It works.
You’re right. The only thing that makes sense is thinking a mesh is a surface/polysurface. A mesh will not export as a solid but it will export as a mesh provided the export settings are set accordingly.
I agree this is an issue. Often I see students come to us with problem files for the rotary knife or laser cutter - which they are required to export as dxf for compatibility reasons - and the files are missing some curves. The first thing I tell them is check for invalid objects and 99.9% of the time, that’s the problem. The thing is, 1- they don’t know the objects are invalid and 2- there is no warning that something might not have been exported…
Certainly turning on CheckNewObjects can help with #1, but an explicit warning for #2 would also be a good indication to them that something is wrong. It may seem annoying for a message box to pop up when this happens, but a real in-your-face warning would be the best in this case IMO.