Mesh to nurbs

[EliabuRada]

Hello ,
I am trying to make out of these meshes clean polysurfaces,
but except of mesh to nurbs on rhino which is not giving a clean result , i have no idea how to do it.
any hint would be highly appreciated

[davidcockey]

MeshToNURB replaces each mesh face with a simple degree 1 NURBS surface. The number of NURBS surfaces equals the number of mesh faces. MeshToNURB does not create a single NURBS surface from multiple mesh faces.

[TomTom (Tom)]

This is not a trivial problem because you are going from less information to more information by converting a polygonal model into a “clean” surface model. I think if amodel is this detailed, then its very hard to automate this process. There is professional tooling for surface reconstruction, but in general this is just a bad idea. For such models its even an advantage to keep it as a mesh. You may elaborate on what you are actually trying to achieve here.

[EliabuRada]

@TomTom

You may elaborate on what you are actually trying to achieve here

Thank you for your reply,
For shade research i wanted to insert this google map model into Archicad,
but something went wrong and some parts of the mesh are not importing into AC.
i though it might be because it is a mesh, and that with surfaces it might be easier…

[TomTom (Tom)]

I’m not sure, but I believe seen that Archicad can only deal with polygons anyways. You might try to “repair” or re-tesselate(=“remesh”) the model. You can search the forum for related articles. I don’t think a surface reconstruction is the right way for this problem.

[EliabuRada]

OK, i ll try that.
Thank you very much

[Yannic1 (Yannic)]

I’m not sure if you’ve already solved the problem, but here’s what I do when working with mesh environment models. Meshes can be tricky to handle, so I use the CAD software Allplan. Allplan automatically converts meshes into polysurfaces, making them easier to work with.

To do this:

1. Export the file from Rhino as a Rhino 4 version.
2. Drag and drop the file into Allplan to import it.
3. After Allplan converts it, export it again as a Rhino file.

This process simplifies working with mesh models. (Also the level of detail remains consistent!)

[martinsiegrist]

@Yannic1

Meshes can be tricky to handle

@Yannic1

converts meshes into polysurfaces, making them easier to work with

Or just learn how to work with meshes…

[cdordoni]

@Yannic1

I’m not sure if you’ve already solved the problem, but here’s what I do when working with mesh environment models. Meshes can be tricky to handle, so I use the CAD software Allplan. Allplan automatically converts meshes into polysurfaces, making them easier to work with.

To do this:

1. Export the file from Rhino as a Rhino 4 version.
2. Drag and drop the file into Allplan to import it.
3. After Allplan converts it, export it again as a Rhino file.

This process simplifies working with mesh models. (Also the level of detail remains consistent!)

That sounds exactly like what MeshToNurb does. You don’t want to do this on a high poly mesh model for so many reasons. Use the mesh as Martin indicates, or if the mesh is too large, decimate it. If you are not happy with Rhino’s own decimation, you can try BalancerNPro, see the thread here where it is discussed. Extremely bad performance with STL scan files

[Rhino_Bulgaria (Bobi)]

I also vote for the BalancerNPro program. Works really fast and consumes much less RAM than opening the same 3d mesh file in Rhino.