Unroll surface

Hello,

I’ve encountered an issue unrolling surface via grasshopper. I’ve tried components by Blickfeld, from Pufferfish, Lunchbox, Wombat and OpenNest2. All give the same incorrect result.
Using the “unrollsrf” command works correctly.

Unrolling the surface as a whole seems to work correctly, as long as no trims are introduced.
This forces me to do a lot of duplicitous work, modeling the surface in 3D and applying the same trims and cuts to the unrolled surface.

UnrollSurface.gh (24.0 KB)
UnrollSurface.3dm (143.1 KB)

The surface I want developed is a trimmed segment of a larger surface.

The surface as a whole is developable, nothing funny happens in the trimmed section either.


The original surface was lofted through a buch of line segments using the grasshopper loft component.

On further experimentation, shrinking the trimmed surface solves the problem.
I’m not sure if that’s a bug or correct behaviour.

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