[vtkusers] Problem coloring the Iron Protein sample dataset

[Prabhu Ramachandran]

>>>>> "WRS" == William R Sherman <wsherman at ncsa.uiuc.edu> writes:

    WRS> The problem is that I can't seem to affect the colormap used
    WRS> for rendering cutting planes or the isosurface of the Iron
    WRS> Protein example dataset -- even when the exact same code
    WRS> works fine for two other example datasets (RectGrid2.vtk &
    WRS> office.binary.vtk).  Below is the TCL script that distills
    WRS> what I'm trying to do.  You can change the name of the
    WRS> argument to the "SetFileName" method to compare the datasets.
    WRS> One hypothesis is that the problem is a result of the fact
    WRS> that ironProt.vtk is a StructuredPoints dataset, but there
    WRS> must be a way to color such data.

That is because ironProt.vtk has its point data attributes stored as
unsigned_chars.  These are interpreted by default as colors and not
scalars.  To work around this try adding something like this to all
your mappers:

  isoMapper SetColorModeToMapScalars

cheers,
prabhu