I’m looking to join 2 surfaces. The idea behind the form is to have one peel off the other almost like a sticker. I am looking to model this and would be thrilled if I could do this through 3d printing. It would also help to do this for diagrammatic figures.
I started from a SubD and have done both SubD to NURBS and joining the surfaces and trying to extrude them (which results in a failure) and by extracting edge loops, patching it, extruding individual surfaces, then unioning (which also results in a failure). I also tried intersecting and differencing. Both are close polysurfaces and I assume its a naked edge error.
Are there any ways I can tackle this? Id prefer to not have to draft each line or extract them and splitting/joining.
If that doesn’t work for you, are you using an earlier version of Rhino? I’m on 8.18.25084.13001, 2025-03-25.
I’m assuming you want to combine solid objects with a degree of thickness. If i am wrong and you actually want to join open surfaces with no thickness, then I get the impression from your forms that you need three surfaces to come together at a single edge. That is called a non-manifold edge and isn’t possible in standard nurbs. However, McNeel provide a way to override the normal behaviour, using the NonmanifoldMerge command. Note that this comes with the caveat that it may cause problems in downstream processes.
That’s very interesting. I tried it again and it seemed to work. I am not entirely sure as to how it was failing me prior to posting this. I managed to connect them as polysurfaces prior and tried to extrude from there. Thank you for your time. Is there any other way I could do this? Or is the process of converting a SubD srf to NURBS the only way to accomplish this?
