[vtkusers] How do I control the color of a surface?

[David Doria]

On Mon, Mar 12, 2012 at 8:42 AM, Ilan <ilan.tal at gmail.com> wrote:
> I have an initial program going with a Java wrapper which gives me contours,
> of the skin or bones or both.
>
> What I think is the relevant code segment is:
>                vtkPolyDataMapper map1 = new vtkPolyDataMapper();
>                map1.SetInput(skinNormals.GetOutput());
>                map1.SetImmediateModeRendering(1);
>
>                actor1 = new vtkActor();
>                actor1.SetMapper(map1);
>                actor1.GetProperty().SetColor(0, 1.0, 0);
>
> Without the last line for setting the color what I receive is a red surface
> for values below 1000 and a blue surface for values above 1000. This is
> fine, but I thought I'd try making it a green surface, so I added the
> SetColor line. It ignores me completely and I don't know why. Can anyone
> give me a hint?
> Thanks,
> Ilan

I think you need:
 mapper->ScalarVisibilityOff();

As this seems to be a very common problem, I created a shell of an example:
http://www.vtk.org/Wiki/VTK/Examples/Cxx/Visualization/ScalarVisibility

Maybe you can set it up so it mirrors your case where the data has
associated scalars that are overriding the actor's coloring without
the call to ScalarVisibilityOff().

David