I really like the form, very cool.
That is a hard problem in that Revit is limited in what it can import as a Surface. The mesh is just a symptom that Revit rejected the NURBS defininition.
Here are a few clues that you could see it was going to happen:
- In Rhino if there are many isoparms that are not bunched up in places, that is a sign that the original curves are not well formed. So, instead of this:
you will want the surface to look like this:
- Also, Revit does not like edges less then 1mm. Here is the bottom edged of the trims that go to a point:
If I reduce these to surfaces and solids. Then use the rebuilt surface with less isoparms you can get it into Revit quite nice. Here is one bay as an example:
I only got to work on this model just quickly. I am happy to answer any questions you have about how to progress to a solution here within your workflow.