[vtkusers] Transparent values of vtkImageData

[Najzero]

Hi Alex,

you might wanna have a look into vtkLookupTable

We use it for example to have "black" values to be transparent.

First build the lookuptable, then apply to the texture.

<snippet we use>
body->_volume.reset( new dicom::modDicomVolume );
    body->_lookupTable = vtkSmartPointer<vtkLookupTable>::New();
    body->_bmpPixelData = vtkSmartPointer<modImage>::New();   // Pixeldaten
    body->_bmpPolyData = vtkSmartPointer<vtkPolyData>::New(); //
Polygondaten
    body->_texture = vtkSmartPointer<vtkTexture>::New();      // Textur

    //=== set lookup table so it shows black values transparent
    body->_lookupTable->SetNumberOfColors( 255 );
    body->_lookupTable->SetTableRange( 0.0, 256 * 256 - 1 );
    body->_lookupTable->SetHueRange( 0.0, 0.0 );
    body->_lookupTable->SetSaturationRange( 0.0, 0.0 );
    body->_lookupTable->SetAlphaRange( 0.0, 1.0 );
    body->_lookupTable->Build();

    body->_texture->SetInput( body->_bmpPixelData ); // Der Textur die
Pixeldaten zuweisen
    body->_texture->MapColorScalarsThroughLookupTableOn();
    body->_texture->SetLookupTable( body->_lookupTable ); // Der Textur die
Lookup-Table zuweisen

    body->_texture->InterpolateOn();



KR Adrian

--
View this message in context: http://vtk.1045678.n5.nabble.com/Transparent-values-of-vtkImageData-tp5714562p5714583.html
Sent from the VTK - Users mailing list archive at Nabble.com.