[vtkusers] Contours and scalars?

[Malcolm Drummond]

Hi David

I'm guessing you want to contour on elevation but some datasets contain values for speed, energy, temperature etc at every point - how else would users be able to contour these if it was not done through scalars?

If you want to contour your z values you can use a vtkElevationFilter to generate scalars from your dataset. First you'll have to generate some structure though, at the moment you just have a bunch of unconnected points. Try running your data through vtkDelaunay2D, this will give you a dataset of connected triangles - then use the elevation filter, then contour.

If you search through the examples you'll find cases of vtkElevationFilter, vtkDelaunay2D, vtkContourFilter.

HTH
Malcolm
 
  ----- Original Message ----- 
  From: david michell 
  To: vtkusers at vtk.org 
  Sent: Tuesday, April 20, 2004 7:41 AM
  Subject: [vtkusers] Contours and scalars?


  Hi Everyone,
  I want to know why vtkContourFilter needs scalar values?
  What role does the scalar values play in contouring?

  HELP!
  David Michell 



   
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