Splitting surfaces with a curve

Hi everybody, does anyone know how to connect a set of points on a curved surface in order to create o curve (circle) and then use this curve to split the surface in two new surfaces? I have tried to connect the points using isocurves but then I cannot isolate the one I want to. Sorry if I cannot describe the problem accurately enough. I hope the attached file will help. The point I would like to connect are those exactly above the circular cuts at the base of the structure.

Attachments:

Splitting surfaces with a curve.gh, 11 KB

Replies to This Discussion

Permalink Reply by Joseph Oster on August 2, 2016 at 6:25pm

'CrvSrf (Curve On Surface)' isn't the only way to get that circle.

Attachments:

Splittingsurfaceswithacurve_2016Aug2a.gh, 16 KB

Permalink Reply by Joseph Oster on August 3, 2016 at 9:26am

Here is how to use an isocurve to split a surface (note that it is re-parameterized!):

You could also use a horizontal plane intersecting your surface.

Attachments:

Splittingsurfaceswithacurve_2016Aug3a.gh, 21 KB

Permalink Reply by Georgios Drosos on August 3, 2016 at 9:35am

Thanks a lot. Is it possible to convert the two resulting surfaces into meshes of different type (different no. of elements or different type of element) and somehow rejoin them into a mesh. I mean, can this be done with the tools provided in Grasshopper? I have used the brep-to-mesh command but the outcome does not really help since i need to be able to manually change the number of the elements in the mesh created from the upper surface.

Permalink Reply by Joseph Oster on August 3, 2016 at 10:40am

I don't know much about meshes, sorry. Did you explore the 'S (Settings)' input to 'Mesh Brep'? Right-click 'S' or use GH component 'Custom Mesh Settings'.

Permalink Reply by Georgios Drosos on August 3, 2016 at 10:47am

Yes I have tried changing the settings. I guess there has to be a way to use the join mesh command somehow that I have not thought of so far. Thanks anyway.

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