Hi, I’m exporting OBJ and FBX from Blender, and each time Rhino imports the objects as exploded multiple surfaces. I don’t know what to do any more.
There is not much to do here. That is how Rhino meshes work. Where there are hard edges typically you have unconnected geometry.
From the same Box extrusion in the back right front is the extracted render mesh. One corner moved up. On the left everything welded, same corner moved up. You can see the undesirable shading artifact on the left box.
Yea, I give up. If you have any suggestions how to bring objects from Blender into Rhino as single objects instead of 100 separate surfaces i’m all ears. This has to be a straightforward process and I’m probably missing something. Thanks.
This is how the Rhino mesh works. Where there are seams or hard edges geometry will generally be unwelded. You could select all mesh vertices and use _WeldVertices, but you might end up with undesirable effects.
What are you trying to do?
All I want to do is build an object in Blender, and import it in Rhino and not have it come in as 10,000 separate faces.
The question is what you want to do.
I have used Blender a lot to generate cloth and water sim meshes for Rhino. Can’t say this has been a problem for me.
I want to build some landscape surfaces in Blender and import them in Rhino. I haven’t had issues in the past either. It just seems that now objects are coming in split up
Are you saying that your landscape object comes in as several objects?
Are you looking to further modify the geometry in Rhino?
addendum:
I tried with this terrain/ocean mesh. These all import as continuous meshes.
TerrainTest.obj (323.1 KB)
TerrainTest.fbx (139.2 KB)
I’m not sure how you are getting them imported with all faces disconnected from each other.
Perhaps you can upload a Rhino 3dm file to show a problem, along with an obj that does this?
Yes. here are the two test objects that when i import to rhino they come in with faces disconnected. Thanks.
RTEST.fbx (11.6 KB)
RTEST.obj (1.6 KB)
You have to shade smooth before exporting to have these mesh faces be connected. This is true for say a sphere or torus. Both are essentially continuos surfaces. If you export them without smoothing you’ll have these faces disconnected. Apply smoothing (Object > Shade Smooth) then export you’ll get the faces connected.
Again, this is how Rhino meshes work. Where there are hard edges (not smoothed) geometry is disconnected.
Hi @Stefano_Ascari and @nathanletwory
I think you are talking past eachother here. Both test files that Stefano uploaded comes in as a single mesh here. There must be a setting in his import options (most likely Unweld at 0°) that causes this. @Stefano_Ascari, could you screengrab your import options and post them?
HTH, Jakob
@Normand they come in as single mesh, yes. But the faces are disconnected. With the imported object selected Pon, then select a corner vertex. You’ll notice there are three corner vertices for hard corners.
I believe this is what @Stefano_Ascari is referring to.
Ah - now I get it! Sorry for being dense, @nathanletwory !
No worries! Rhino meshes easily confuse people. It took me a long time to really “get” them. (And no, I don’t like them).
Primarily, Rhino does not have edge information really, edges are inferred. Rhino meshes have vertices and faces.
You’ll have to explicitly use _WeldVertices to merge double verts (to use oldskool Blender talk).
Unfortunately using this type of geometry will cause unexpected and most likely undesired rendering artifacts.
Here a cube with the corners all welded, then a metal assigned and put into Raytraced mode
This is true for edges that are supposed to be hard.
You’re totally right. The “shade smooth” option fixed it and created a welded mesh. This was very helpful thanks!
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