[vtkusers] Bug in vtkImageStencil

[Michael Knopke]

Hi Kevin,

 

Thanks for the example, but still no luck. If the stencil should cover both
the image_data and the poly_data (that is used for stenciling) shouldn't it
calculated like this?:

  double max_bounds[6];

  int sign =1;

  for(int i=0;i<6;i++)

    {

     sign = sign*(-1);

    if(sign<0)

      {

      if(poly_bounds[i]<image_bounds[i])max_bounds[i]=poly_bounds[i];

      else max_bounds[i]=image_bounds[i];

      }

    else

      {

      if(poly_bounds[i]>image_bounds[i])max_bounds[i]=poly_bounds[i];

      else max_bounds[i]=image_bounds[i];

      }

    }

 

  int max_extent[6];

  for ( int i = 0; i < 3; ++i )

    {

    max_extent[ i * 2 + 0 ] = 0;

    max_extent[ i * 2 + 1 ] = (int)(

      ( max_bounds[ i * 2 + 1 ] - max_bounds[ i * 2 + 0 ] ) 

       /image_spacing[i]);

    }

 

However both approaches result in crashes, whenever my polydata leaves the
image bounds.
Regards,

 

Michael

 

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