Remap trimmed surfaces, to make them untrimmed surfaces

Replies to This Discussion

Permalink Reply by David Rutten on March 15, 2010 at 6:17am

Untrim

Shrinking involves removing all the control-point rows and columns that are outside of the trimmed edge and thus do not affect the shape of the surface remainder.

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David Rutten
david@mcneel.com
Poprad, Slovakia

Permalink Reply by Kayin Dawoodi on March 15, 2010 at 8:37am

My bad, I did not explain myself well...

I mean that once you have created a Trimmed Surface, use that new surface as though it were an Untrimmed Surface.

I had done this before by plotting lots of points on the Trimmed Surface then either using the SrfGrid (Surface From Points) component or using that point cloud on the Trimmed Surface and "joining-the-dots" with curves that I then lofted to recreate the surface as an Untrimmed Surface, but this is tedious and feels very inefficient and lacks accuracy.

Apologies,
Kayin

Permalink Reply by David Rutten on March 15, 2010 at 9:43am

Well that depends on the trim curves. If the resulting surface is sort of rectangular, then you can probably make an untrimmed surface that looks about the same. But it's definitely not possible if the trimmed surface has any holes or more than 4 edges.

--
David Rutten
david@mcneel.com
Poprad, Slovakia

Permalink Reply by Chris Ball on November 1, 2010 at 2:32pm

David,

What then is it about the coding of Rhino that makes it difficult to work with trimmed surfaces?

Chris

Permalink Reply by kipodi on December 1, 2010 at 2:48am

I tried to do contour lines and loft the, but its ot the same exactly..maybe its best to use tsplines for amorphic shapes