void VolumeVisualizationImagePreprocessor::UpdateTransferFunction( TransferFunction::Pointer tf, int treshold )
{
double opacity = 0.005;
//double maskValue = m_OutOfLiverValue;
//double surfaceValue = m_surfaceValue;
//double realSurfaceValue = m_realSurfaceValue;
//double surfaceSteepness = 0.0;
//VVP_INFO << "changing to threshold of " << treshold << " and opacity of " << opacity;
// grayvalue->opacity
{
vtkPiecewiseFunction *f=tf->GetScalarOpacityFunction();
f->RemovePoint( m_LastUsedTreshold-1 );
f->AddPoint(treshold-1,opacity);
f->RemovePoint( m_LastUsedTreshold+4 );
f->AddPoint(treshold+4,0.8);
}
// grayvalue->color
{
vtkColorTransferFunction *ctf=tf->GetColorTransferFunction();
ctf->RemovePoint( m_LastUsedTreshold-32 );
ctf->AddRGBPoint( treshold-32, 0.2, 0.0, 0.0 );
ctf->RemovePoint( m_LastUsedTreshold );
ctf->AddRGBPoint( treshold, 251/255.0, 1.0, 0.0 );
}
m_LastUsedTreshold = treshold;
}
TransferFunction::Pointer
VolumeVisualizationImagePreprocessor::GetInitialTransferFunction( )
{
int treshold = m_EstimatedThreshold;
double opacity = 0.005;
double maskValue = m_OutOfLiverValue;
double surfaceValue = m_surfaceValue;
double realSurfaceValue = m_realSurfaceValue;
//double surfaceSteepness = 0.0;
VVP_INFO << "using threshold of " << treshold << " and opacity of " << opacity;
TransferFunction::Pointer tf = TransferFunction::New();
// grayvalue->opacity
{
vtkPiecewiseFunction *f=tf->GetScalarOpacityFunction();
f->RemoveAllPoints();
f->AddPoint(maskValue,0);
f->AddPoint(maskValue+1,0);
f->AddPoint(surfaceValue,0.05);
f->AddPoint(realSurfaceValue,opacity);
f->AddPoint(treshold-1,opacity);
f->AddPoint(treshold+4,0.8);
f->AddPoint(m_MaxThreshold+1,0.8);
f->ClampingOn();
f->Modified();
}
// gradient at grayvalue->opacity
{
vtkPiecewiseFunction *f=tf->GetGradientOpacityFunction();
f->RemoveAllPoints();
f->AddPoint( -1000.0, 1.0 );
f->AddPoint( 1000, 1.0 );
f->ClampingOn();
f->Modified();
}
// grayvalue->color
{
vtkColorTransferFunction *ctf=tf->GetColorTransferFunction();
ctf->RemoveAllPoints();
ctf->AddRGBPoint( maskValue, 0.5, 0.0, 0.0 );
ctf->AddRGBPoint( maskValue+1, 0.5, 0.0, 0.0 );
ctf->AddRGBPoint( surfaceValue, 1.0, 0.0, 0.0 ); //0.5
ctf->AddRGBPoint( realSurfaceValue, 0.2, 0.0, 0.0 );
ctf->AddRGBPoint( treshold-32, 0.2, 0.0, 0.0 );
ctf->AddRGBPoint( treshold, 251/255.0, 1.0, 0.0 );
ctf->AddRGBPoint( m_MaxThreshold+1, 251/255.0, 1.0, 0.0 );
ctf->ClampingOn();
ctf->Modified();
}
m_LastUsedTreshold = treshold;
return tf;
}