[vtkusers] Pondering about the vtkContourFilter

[Kevin Wright]

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.