[vtkusers] Pondering about the vtkContourFilter

[Berk Geveci]

>From the current (CVS) vtkContour.h file:

  // Description:
  // If you want to contour by an arbitrary array, then set its name
here.
  // By default this in NULL and the filter will use the active scalar
array.
  vtkGetStringMacro(InputScalarsSelection);
  void SelectInputScalars(const char *fieldName) 
    {this->SetInputScalarsSelection(fieldName);}

:-)

On Tue, 2002-05-14 at 13:02, Kevin Wright wrote:
> Hi All,
> 
> After my recent change to VTK 4.0, I started attaching multiple scalars to 
> each vtkPointSet that is loaded into the system here, instead of creating a 
> new pointset for each one.  This has been great for the general 
> architecture of our system, the one problem I had was if two different 
> pipelines latched onto the the same pointset, but wanted different scalar 
> fields contoured (i.e. an iso-surface of density, and an iso-surface of 
> pressure), there was still the problem that both pipelines needed their own 
> pointset so that they could set their own current scalar.
> 
> Instead of setting things up that way, I changed the vtkContourFilter to 
> add an extra function that specifies an arbitrary array to use for 
> contouring instead of the default scalar.  This seems to work out very 
> nicely, and I was wondering if people thought that would be a good addition 
> to vtkContourFilter (and any other filter that uses scalar or vector fields 
> to build... stream lines?...) ?  Is there a specific reason that I haven't 
> thought of why this wasn't done?  Is there already a way to do it that I 
> haven't thought of?  Will we see peace in our time?
> 
> Thoughts?
> 
> Kevin.
> 
> 
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