Hi,
I have this perfectly valid polysurface in Rhino.
When imported into Revit some unknown edges are generated which ruin the drawings.
File tolerances are:
This is how we are importing.
Here the file:
test 13.3dm (1.3 MB)
It still needs to conform to Revit’s tolerances.
We try to bring any geometry as native Revit geometry, if it fails we try and clean it up a bit, if that fails we try to import via the mesh. This looks like one of the fallback imports.
A quick test is to create a new file and add geometry direct shape and look at the error report, problematic areas are highlighted in Orange in the GH preview of the brep.
Hi Japhy, are these Revit components available without Revit? (I don’t use Revit) just getting complaints from the Rhino models 
I know the geometry has errors, it is not clear to me how to fix it? Thank you.
I am working at 0.01 tolerance. Isn’t that fine given Revit tolerance is 0.0001 of a meter?
Or should I set my Rhino to 0.0001? Seems like a lot.
Edit: Ah yes, Revit components do not appear in normal Rhino after installing Rhino.Inside. I can’t do those fast checks. Don’t have Revit installed nor a license, nor do I plan to.
No issues with our importer,
what version of Revit are you targeting?
Is the user doing a .3dm import, dwg or other intermediary file?
This one.
Not sure but they are still with Rhino 7. So everything we send in Rhino 8 they export to Rhino 7 and then import that .3dm.
I see, just as a note, the error seems to appear in plan and elevation, not perspective.
Yes, that’s it! Glad you found it too… or not glad actually 
Will you guys look into this and try to figure out what is going on? Thanks.
Pushing the geometry in with Direct Shape gives a similar result and no Errors. Whatever is happening with the cut display (plan / elevation) looks to be on the Revit side, we aren’t fixing small edges or anything.
Well yeah, it is obviously all on Revit side, the geometry is valid in Rhino and has no problems.
But still, I thought the whole point of Rhino.Inside was to expand Rhino into other markets such as AEC facilitating seamless integration with Revit.
This is not seamless integration.
Certainly, but we have to work within Revit’s ruleset – for better or for worse.
Okay. Just to round this up. I should tell the Revit guys at the office to use the Direct Shape method instead of import 3DM and that should have no issues? And if they are still issues that there is nothing to do form Rhino’s side and that they should raise the issue to Autodesk correct?
I do recommend using the Brep → Add Geometry DirectShape, primary due to the error reporting as well as more control over materials & categories.
You can try contacting autodesk about the artifacts/poor display in cut views of complex geometry (plans/section/elevations) but since Revit is more of a documentation software than modeling they will probably direct you to info about creating alternate representations of these elements vs changing the geometry kernel.
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