[vtkusers] How to generate a surface normal glyph for a triangle cell

[Elvis Dowson]

Hi,
         I really need some help with this problem! :-)  Guys, I've  
tried many things, first with a plane source and then with a  
unstructured grid, converted it to a poly data and used  
vtkPolyDataNormals and set ComputeCellNormalsOn. It still doesn't give  
the desired results.


vtkDataSetSurfaceFilter triangleCellDataSetSurfaceFilter
   triangleCellDataSetSurfaceFilter SetInput aTriangleGrid

vtkPolyDataNormals triangleCellNormals
   triangleCellNormals SetInputConnection  
[triangleCellDataSetSurfaceFilter GetOutputPort]
   triangleCellNormals ComputePointNormalsOff
   triangleCellNormals ComputeCellNormalsOn
   triangleCellNormals ConsistencyOn
   triangleCellNormals AutoOrientNormalsOn

vtkPolyDataNormal::ComputeCellNormalsOn() doesn't seem to be working.  
There should only be 1 single cell normal, right? I created this  
example to explicitly use a single triangle cell, to test this funtion.

I've been at this problem for 2 days straight and tried all sorts of  
suggestions, but I still haven't found an explanation for describing  
the above results. Please help!! :-)

I've attached the full source code with this message.



Best regards,

Elvis Dowson


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