[vtkusers] Graph vertex coloring not working

[Jeff Baumes]

On Tue, Mar 30, 2010 at 9:00 AM, David Doria <daviddoria+vtk at gmail.com> wrote:
> On Mon, Mar 29, 2010 at 9:42 PM, Jeff Baumes <jeff.baumes at kitware.com> wrote:
>> vtkGraphLayoutView does not support a special unsigned char array
>> named "color" for coloring vertices. You will need to use an array
>> with normal scalar values (e.g. a vtkIntArray) and then use
>> vtkViewTheme's point lookup table to set up the proper mapping of
>> integers to colors.
>>
> Isn't that what this function is for:
> http://www.vtk.org/doc/nightly/html/classvtkGraphLayoutView.html#a45b37f2ed2ee24681616deea31b98e00

This is for setting the name of the scalar array that will be sent
through the lookup table. The named array is not intended to hold
color values directly.

> I did what you said (using a vtkViewTheme) and it still seems to have
> the problem of 2 vertices get colored one color (red) and two another
> (green).

You are close. You only set 2 table values, so all scalars will be
mapped to one or the other. If you add intermediate table values you
would be ok.

Jeff