sigtrap? (how to update texture coord)

[Dongbai Guo]

I would like to update the texture coordinates for a polydata, e.g. to
do the following: 

 vtkSmoothPolyDataFilter *  ds_mesh ; 
 ....
 vtkPoints * points= ds_mesh->GetOutput()->GetPoints();	
  ...
 int npts= points->GetNumberOfPoints();
 
 // for each point, update its texture coordinates ...

 // ds_mesh pass its output to a  mapper
 // render


However, I get sigtrap each time I am trying to find number of points.
It appears to me that points points to non-valid address.

if I comment out the update texture coordinates code, let the pipe line
run as before, no error occurs. 


My question is: can you update the texture coordinate once polydata is in
the visualization pipeline? (not in source )
If you can,  filters such as decimate or smooth does not update texture
coordinate themselves, how can I update it, should the update code be
reside in excute() function instead? 


Please help, thanks! 



Good luck! 

Dongbai 

--------------------------------------------------------------
	Tel:   401-863-7693 (graphics lab)
	http://www.cs.brown.edu/people/dbg
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