Hi, The problem is that the uv input of the "Evaluate Surface" component is being fed by 3d points. Instead of using the "Brep CP" component, use the "Surface CP" component. This component has an extra output with the uv coordinates you need. Link this output with the uv input of the evaluate surface component. Besides, you don't need the "plane normal" component. The F (frame) output of the "evaluate surface" component is already a plane.
Since you've got many planes/points overlapping, I would also disable the preview of all the components (select all and press ctrl-shift-q) and from there enable the preview individually when you are working on them. On Jan 28, 7:31 pm, Marc Syp <[email protected]> wrote: > Sorry to bump this up, but I feel like I'm missing something really > simple. Any tips appreciated. > > Thanks, > Marc > > On Jan 28, 12:16 pm, Marc Syp <[email protected]> wrote: > > >http://grasshopper3d.googlegroups.com/web/extruder-test.3dm?hl=en&gda... > > >http://grasshopper3d.googlegroups.com/web/extruder-test.ghx?hl=en&gda... > > > Please take a look at the definition and rhino model I have provided. > > It is quite a simple definition but I am having some problems with the > > surface analysis. I am trying to use the surface as a guide for > > rotating extruded geometry. Here's the concept: > > > I have a wireframe model and a surface that was used to generate the > > triangulations. 1) I make a plane perpendicular to each line at the > > start point. 2) I take the start point of every line and find the > > closest corresponding point on the surface. 3) I find the normal of > > the surface at that point and use the resulting vector to orient my > > original plane. 4) On that plane I create a rectangular section (16cm > > x 8cm), which should be oriented properly tangent to the surface. > > > I can get everything to work except for the surface analysis. When I > > create a plane perpendicular to the resulting normal vectors, I expect > > to see a plane tangent to the surface. Instead they all appear to be > > perfectly horizontal. Therefore my alignments do not work properly > > and I cannot get the proper structural result (i.e., the deep part of > > the steel section should be seated perpendicular to the surface at my > > sample point. Can someone explain what I'm doing wrong? > > > Thanks, > > Marc S.
