Working with trimmed surfaces

Hello there,

I am happy to say im using grasshopper in my work and continuously taking positive feedback from my collegues. Usually when I have a problem I can find a solution online fast or solve it myself trying hard but with this one I am really troubled.

The problem is nothing new, also in forums here but i just couldn't find a well explained solution to manage this kind of workflow.

I have trimmed surfaces which are parts of the original facades. Usually I use subdivision or meshing to generate textures, patterns or whatever is necessary on facades but with these trimmed shapes it is not possible. Now I know that trimmed surface actually carries the information of original surface and when you do an operation like subdivision it uses the original surface to calculate. And if you want to work on it as a individual surface you need additional information. My question is what is this additional information and how can I achieve to build a similar surface based on these trimmed shapes using this information.

Thanks in advance and hope to find a clear solution soon.

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trimmed surface_problem.jpg, 453 KB

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Permalink Reply by Hannes Löschke on April 17, 2012 at 3:11am

Did this meshing work on any definition so far?
The mesh-triangle is nothing but a set if numbers indicating the index of the corners in the vertices list. So if you take the vertices of the brep (which is nothing but the corners, that in your case may be all along one single line) and plug an empty mesh face, mesh has no way of building the mesh.

Better use the MeshFromBrep component. but that may not produce the reult you want.

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Permalink Reply by eren on April 17, 2012 at 3:35am

In this project I was using surface morph so the mesh there is just a leftover from an old code or sth. The reason I didn't share the code is also that it is too messy. Yes when I use meshfrombrep it will use the the original untrimmed surface for the operation so it wouldn't help me.

I also tried to explode the trimmed surface, take the starting and ending edge curves. Taking sections from the surface and tried to build a new loft using the starting edge line, ending edge line and section curves. But sadly, it didn't work..

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Permalink Reply by eren on April 17, 2012 at 7:07am

Okay now I tidied up my definition a bit and I am sending it.

The problem is like I said redefining or recreating the trimmed surface so that I can use subdivision strategies or whatever. Usual redifine or shrink stuff does not work.

You will see that I tried to make a new loft using some section curves taken from the trimmed surface. But the result is really distorted, not beautiful as the original surface. What other strategies can you think of? Any idea is welcome..

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