[vtkusers] How to use vtkPointPlacer?

[Romuald BERTRAND]

Hi all,

For my work, I have to colorize some pixels on an image, and until now I use this algorithm:

    vtkPoints* pts = vtkPoints::New();
    vtkDataArray* scalars = vtkUnsignedCharArray::New();
    scalars->SetNumberOfComponents(3);

    //-----------------------
    //for(.........
    //I insert all of my points
    //-----------------------

    vtkDiskSource* src = vtkDiskSource::New();
    src->SetRadialResolution(1);
    src->SetCircumferentialResolution(15);

    src->SetInnerRadius(0.0);
    src->SetOuterRadius(1.0);

    vtkPolyData* polyData = vtkPolyData::New();
    polyData->SetPoints(pts);
    polyData->GetPointData()->SetScalars(scalars);

    vtkGlyph3D* glyph = vtkGlyph3D::New();
    glyph->SetSourceConnection(src->GetOutputPort());
    glyph->SetInput(polyData);

    glyph->SetColorModeToColorByScalar();
    glyph->SetScaleModeToDataScalingOff() ;
    
    vtkPolyData* outPut = glyph->GetOutput();

    vtkPolyDataMapper* mapper = vtkPolyDataMapper::New();
    mapper->SetInput(outPut);

    actorColorize = vtkActor::New();
    actorColorize->SetMapper(mapper);
    
    viewer->GetRenderer()->AddActor(actorColorize);

But this is not very smart, and this create disks, and I want to colorize just the pixels which are in my list.
After, I have found the "vtkPointPlacer" class, but I don't find any explanations to use this.
Can you help me please?

Thanks for answers,
Bye
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