[vtkusers] Is it surface/volume rendering for VE?

[Andres Barrera]

Hi Mohamed,

      I haven't tried to get exactly what you want, but you can enhance your 
visualization (if you want to use surface rendering) with setting some actor 
properties such as:
smoothActor->SetMapper( parisonMapper);

       Actor->GetProperty()->SetDiffuse (...);
       Actor->GetProperty()->SetSpecularColor(...);
       Actor->GetProperty()->SetSpecular(...);
       Actor->GetProperty()->SetSpecularPower(...);
       Actor->GetProperty()->SetAmbient(...);

Also, by using 'vtkPolyDataNormals', your surfaces will look smoother.


       Andres

PS: here's some code you can use to start playing with (at your own risk! :D 
)....

void openSmoothSTLActor(char * fileName, vtkActor* smoothActor)
{
    vtkSTLReader  * sr = vtkSTLReader::New();
      sr->SetFileName( fileName );

    vtkGeometryFilter  *geom         = vtkGeometryFilter::New();
       geom->SetInput( sr->GetOutput() );

    vtkPolyDataNormals *Normals = vtkPolyDataNormals::New();
       Normals->SetInput       ( geom->GetOutput() );
       Normals->SetFeatureAngle( 100 );

    vtkLookupTable     *lut          = vtkLookupTable::New();
       lut->SetHueRange( 0.0, 0.66667);

    vtkPolyDataMapper *mapper = vtkPolyDataMapper::New();
       parisonMapper->SetInput      ( Normals->GetOutput() );
       parisonMapper->SetLookupTable( lut );
       parisonMapper->SetScalarRange( 0.12, 1.0 );

    if (smoothActor == NULL)
        smoothActor  = vtkActor::New();

       smoothActor->SetMapper( mapper );

       smoothActor->GetProperty()->SetSpecularColor( 
smoothActor->GetProperty()->GetColor() );
       smoothActor->GetProperty()->SetSpecular(0.3);
       smoothActor->GetProperty()->SetSpecularPower(20);
       smoothActor->GetProperty()->SetAmbient(0.2);
       smoothActor->GetProperty()->SetDiffuse(0.8);

    // clean up ...
    sr              ->Delete();
    geom            ->Delete();
    Normals         ->Delete();
    lut             ->Delete();
    mapper ->Delete();
}

>
>Dear VtkUsers,
>
>I need to visualize the internal views of hollow organs. I tried both 
>surface and volume rendering of vtk. However, i never get the output 
>provided by commercial packages such as
>
>http://www.vitalimages.com/vipage.aspx?pg=ct-colonography
>
>My questions are, if you already saw that website.
>
>1. Are they using surface/volume rendering (I believe surface!)
>2. How to achieve that quality using vtk. Is it a light problem, or 
>rendering technique one.
>
>I do not think it is my graphic card problem because i have "nvidia Quadro 
>FX 3000. "
>
>
>thanks for your help.
>
>
>
>Mohamed Sabry Mohamed
>Medical Imaging Research Assistant
>CVIP Lab
>University of Louisville
>Kentucky, USA.
>msabry at cairo.spd.louisville.edu
>
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