Grasshopper

algorithmic modeling for Rhino

lofts from two sets of delaunay edges

i am making multiple lofts from two lists of lines. the first list are the edges of a delaunay connectivity, the second set is also a delaunay, but uses an offset of the original input points along a surface´s normals. if the offset value exceeds a certain value (1.98) the second set of lines is somehow messed up and the resulting lofts do not correspond with the delaunay input anymore. can somebody figure out, what´s going on here? i attached the 3dm and the gh-definition.

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Permalink Reply by David Rutten on September 22, 2015 at 9:56am

The problem is probably that the order of edges is not the same. Delaunay sorts all points from left to right before it computes the mesh, so if the second set of points has been transformed that sorting may result in a different edge order.

Perhaps only compute the delaunay once and offset the edges instead of offsetting the points and computing twice?

Permalink Reply by roberto gagliano on September 22, 2015 at 11:29pm

thanks for the insight, this explain quite a few things !

Permalink Reply by Hyungsoo Kim on September 22, 2015 at 10:51am

Hi.

How about using mesh normal vector instead of surface normal?

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Permalink Reply by roberto gagliano on September 22, 2015 at 11:31pm

also thanks a lot for your suggested problem resolution !

it works fine. still, the mesh normals differ slightly from my original normals ...

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