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.
