[vtkusers] Setting colors for Points does not work properly

[Boehm, Lukas]

Hi,

 

i wrote a small POC to set some points in the render window. This works
fine and I've found many examples which describe how to set the color
for each point. But that's the problem. I've got the following code:

 

            vtkRenderWindow renderWindow =
this.renderWindowControl1.RenderWindow;

            // create points-object

            vtkPoints pts = vtkPoints.New();

            // create double-array for colors

            vtkDoubleArray colors = vtkDoubleArray.New();

            colors.SetName("colors");

            colors.SetNumberOfComponents(3);

            // insert point and color-tuple

            pts.InsertNextPoint(0.0, 0.0, 0.0);

            colors.InsertNextTuple3(0.3, 0.0, 0.0);

            

            vtkPolyData polyData = vtkPolyData.New();

            // add points to polydata object

            polyData.SetPoints(pts);

            // add colors to polydata object

            polyData.GetPointData().AddArray(colors);

 

            // points should be displayed as crosses

            vtkGlyphSource2D cross = vtkGlyphSource2D.New();

            cross.SetGlyphTypeToCross();

            vtkGlyph3D glyph = vtkGlyph3D.New();

            // connect polydata with glyph-object

            glyph.SetInputConnection(0, polyData.GetProducerPort());

            glyph.SetSourceConnection(0, cross.GetOutputPort());

            // define the input array for colors

            glyph.SetInputArrayToProcess(3, 0, 0, 0, "colors");

            glyph.SetColorModeToColorByScalar();

            vtkPolyDataMapper mapper = vtkPolyDataMapper.New();

            mapper.SetInput(glyph.GetOutput());

            vtkActor actor = vtkActor.New();

            actor.SetMapper(mapper);

 

This code produces a yellow cross. But if I want to change the rgb
values of the point it does not work, as I expected. If I change the
line

 

            colors.InsertNextTuple3(0.3, 0.0, 0.0);

 

to 

            colors.InsertNextTuple3(0.3, 0.9, 0.9);

 

then the cross is still yellow. I would have expected that the three
values are interpreted as rgb values. The only interpreted value is the
first double. If I change the first double value, the color of the cross
changes. But I have to set rgb colors.

 

Do you understand my problem? Do I make a mistake? I am using VTK
5.6.1.599 with C#.NET.

 

Thank you very much.

Lukas

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