Hi everyone!
I’m encountering a strange issue with a closed polysurface fully modeled in Rhino. Once the geometry is ready, I use a code-driven file I/O workflow to export it as a .stp file.
The export process seems to work fine, but the problem arises when I try to reopen the STEP file in Rhino: the geometry appears broken or severely distorted.
Interestingly, when I open the same STEP file in other STEP viewers, the geometry looks just fine — which makes me think the issue lies specifically with how Rhino handles the import.
To troubleshoot, I’ve tried exporting the geometry using all four available STEP schemas (FileStpWriteOptions.StepSchema), but the result is always the same when reopening in Rhino.
This geometry is considered final — I’m only reimporting it into Rhino as a quick check to verify the export was successful.
Has anyone else run into this? Is there perhaps an import setting in Rhino I’m missing?
P.S. I’m happy to share the files via DM or through the upload page if needed.
Thanks in advance!
