[vtkusers] plotting boundaries between cell data scalar values

[McClennan, Scott Andrew]

Hello,
I am trying to figure out how to plot cell data so that cell faces that are on boundaries between different scalar values are visible.  For example, I have structured grid data representing a 3x3x3 block of cells composed of two materials with one material block of 3x3 cells sandwiched between the other .  If I turn off the center layer material (by making it transparent or using vtkStructuredGrid::SetCellVisibilityArray()) I would like to see the solid faces of the other material.  Two images are attached to illustrate - one from a simple graphics program showing cell surfaces on all boundaries and the other my attempt with vtk showing missing cell faces on the boundaries.
Can anyone tell me if there is a filter to plot boundaries between scalar values in a single vtkCellData?  I tried toggling backface and frontface culling, but this is not the issue.  The only other way I could think of to accomplish this is to set up separate structured grids for each material, but this seems inefficient.
Thanks for your help,
Scott



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