[vtkusers] Simplest Way To : display normals (move normals to vectors)

Bill Lorensen wlorens1 at nycap.rr.com
Thu Sep 7 22:29:58 EDT 2000

contrib/examplesTcl/OBJReader.tcl uses Glyph3D to display normals.


At 03:51 AM 9/8/00 +0200, Sebastien BARRE wrote:
>Sometimes the simplest questions have long answers, but basically how do you guys display the normals of a points set in the shortest amount of code ?
>vtkHedgeHog provides a simple way to display *vectors*, thus the question is now : how do I move/copy normals data to vectors data quickly ?
>output->GetPointData()->SetVectors(input->GetPointData()->GetNormals) won't work because vtkNormals are not vtkVectors.
>I wrote a vtkNormalsToVectors filter some time ago (as an introduction to polydata filter programming), it's small and easy, but I'm wondering if it's possible to achieve the same effect from Tcl, and without looping over the normals and building a new vtkVectors in a ProgrammableFilter. I'm quite sure there is a trick, one of these elegant and obvious VTK tricks, but lost in this sea of functions/features.

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