specifying vertex color

[Kirt Schaper]

I'm struggling with specifying the color of vertices from a vtkPolyData
object.  I can achieve grayscale, and I can achieve a hue specification,
but I'd like to minimally control both hue and saturation (or R/G/B).

I've tried to specify a lookup table with an entry for each point
(ala $VTK_DATA/polyEx.vtk) but this seems to be ignored -- at least
on my system (vtk 3.1, RedHat 6.1 Linux on Intel, Mesa graphics),
$VTK_TCL/../graphics/examplesTcl/polyEx.tcl shows up in grayscale.
(This is a simple example program supplied with VTK which renders an
8 point, 6 face cube -- specified with a LookupTable with different
colors for each vertex.)

I can achive a hue specification by following the lead of
$VTK_TCL/../graphics/examplesTcl/scalarMapping.tcl and specifying
a vtkProgrammableAttributeDataFilter with the ExecuteMethod set to a
procedure which resets the PointData scalars  (of the PolyData)
to reflect the desired hue (from 0.0 to 1.0).

Can someone supply a simple script which shows how to specify the
R/G/B value (or H/S/L) for each vertex in a PolyData rendering?

Thanks in advance.

----------------------------------------------------------
Kirt Schaper		| Bell: (612) 725-2000 x4791
PET Center (11P)	|  net: kirt at pet.med.va.gov
VA Medical Center	|  FAX: (612) 725-2068
MPLS, MN  55417		|  URL: http://pet.med.va.gov:8080

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