A quick way to make a solid out of two (poly)surfaces?

you have two nurbs surface like

and you want a solid out of it, how can you do that fastly?

selecting by hand each edge and then lofting, is a waste of time, as it seems that unlike subd you cannot select edge loops

extruding the surface, often results in unpredictable results, like you get different objects out of it, even if the surface was one joined surface

and soo you need to play with bools, wishing it wont give issues

Hello- DupBorder then Loft is what comes to mind.


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Out of curiosity can you share these two surfaces in a 3dm file here?

4rforum.3dm (78.3 KB)

here’s the part

I only see one “surface” in the file - it’s actually a polysurface - but if you mean creating a solid from it and a copy which has been moved some distance away, I would just create the top and bottom planar surfaces (Plane, SrfPt), join all and Cap.

Gumball Extrude will work in one shot, but I don’t like the surfaces it leaves on the ends when extruding tangent to the arcs. You could extract those and re-cap the object to have nicer planar surfaces there.

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As mentioned the gumball extrude will work, at least in the latest official Rhino 7 SR 37 and Rhino 8 SR 7.

The file you shared is created with an old Rhino 7 cracked version.

You should get a valid Rhino 7 license (or even better, Rhino 8) and install a non-cracked Rhino version: Rhino - Buy - Rhinoceros

But just like @Helvetosaur and @pascal I’d go about different way to get the solid done.


If you don’t mind the title should say polysurfaces instead of meshes

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would you ming to share a quick video of an extrusion outputting a single solid and not multiple solids which then need to be bool union together?

If the input surfaces are both parallel to some of the World axis (or a custom CPlane is created along the surfaces), then using “Bounding box” may get you a quick box to split with the former to create a solid object with the desired shape.

One potential problem with that approach is that “Bounding box” is inaccurate and may lead to some small deviations.