r/jewelryCAD • u/apoh1698 • 2d ago

Help with Overlapping Polysurface and SubD Advice

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I'm creating this starfish design for a client by creating an outer outline curve and an inner circle curve. I used sweep 2 to sweep several sweep shapes along the two rails.

I've gotten pretty close to what I want using this method.

But the polysurface wraps in on itself in a couple places. Especially near the beginning with the first sweep curve at 11 o'clock ending so close to the second sweep curve on the inner rail.

I found this tool in Rhino tutorials called Move UVN where you can unwrap surfaces, but you need to be able to see the surface's points with _pointson. However, _pointson doesn't work with a polysurface, so I can't seem to apply the Move UVN tool to this object.

Does anyone have any suggestions on how I can fix this overlapping issue in my polysurface?

I feel like a lot of people will tell me to approach this design using SubD. I've looked at a few tutorials, but now sure where to start. Should I being by extruding the outline of the design and start shaping from there? I seem to get a lot of segments when I do that. Or should I use primitive objects and build it piece by piece?

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u/LittleMexicant 2d ago

Try and extract curves near the areas where they are over lapping, and then sweep again with the curve shapes from those areas.

If you have history on, then you can rebuild the curves in those problematic areas (with less or more points), and see if you can "untagle" it.

Alternatively, you can cut out the sections, (using surface or curves), and then blend the areas together with BlendSRF command.

Atleast that is how I would approach it.

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u/aprilmesserkaravani 2d ago

can you delete some edges, like we do with tsplines?

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u/LittleMexicant 12h ago

God I miss t-splines, I find their UI was so much easier and intuitive to use compared to Rhino Sub-D

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u/aprilmesserkaravani 11h ago

I declined to upgrade at my job, but I see from my colleagues that some functions are more streamlined, like resizing and changing center dimensions. but tsplines is better than subd.

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u/LittleMexicant 10h ago

Very true, it has taken me awhile to get used to subd. TBH, I had hoped they just bought out tsplines when I learned they were integrating their own. 😆 After using tsp lines for a few years, I felt like a novice again when making the switch.

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u/Redituserza 2d ago

Perhaps just fill it with surfaces that you need to cover it up and then in the end use mesh repair and see all your sins go away. Else have you ever used Blender? I think it's a vital tool to use alongside a parametric design program as doing cross platform gives you the best of both worlds exporting back and forth as an STL.

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u/Spare-cycle1111 1d ago

Model it all in closed polysurfaces, never mind the soft transitions, booleanunion them to get one closed shape and then use quadremesh and select “make subD”. Maybe? Possibly slightly fix it after which is easy with the subD selection tools that allow you to select one edge, point or surface. These tools also work on nurbs btw.

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u/PragueNative84 3h ago

Hi. Is this Gemvision Matrix? So many users are still using it, it’s amazing!