I am currently working on a project where I need to export a model from Navisworks (.nwd) to Napa (.igs). I export a fbx-file from Navis and open it in Rhino, so far so good. When trying to export from 3dm to igs I get this message: “IGES export type “Default” does not support polygon meshes. 51994 polygon meshes were not imported.”
So it looks like igs does not allow any polygon meshes. And the whole model is in meshes. So my question is, what do I do now? Is there a way way to convert all meshes into something that is accepted by igs? Would love to hear any suggestions from you! Thanks
There is, but that might not be feasible. The better way might be to see if Napa support other file formats that can carry meshes.
If all else fails, the Rhino ToNURBS command will convert each mesh triangle / quad to a NURBS surface. Depending on the number of mesh faces you have in your model, and the specs of your machine, this might or might not work. You’d want to run MergeAllCoplanarFaces on the mesh before trying this, and, perhaps, use this on different parts of the model at a time.
Mvh,
-wim
Thank you Wim! I tried this on a small section and it worked.
I don`t know if this is a method I will use, since the file size went from 10 691 KB (3dm) to 255 015 KB (igs). In addition the surface went from one piece to ten pieces, so it will be difficult to work with it when I have to make changes in the model in the future. Thanks!
Navisworks generates a mesh representation of a CAD model for display and is linked to the original CAD model. Rather than export the FBX which is using Navisworks internal representation, you should determine the source CAD file.
You can go to the selection tree in Navisworks and expand it to see the source CAD files.
In the below example the sources are Revit models (.RVT)
If you do not have the source CAD files, you should contact the person that created the Navisworks file and request an alternative CAD format that you can open in Rhino.
The best choice for this would be STP.
