[vtkusers] [nedunuri_rk at yahoo.com: Re: Help]

[Robert Belleman]

The following was sent to me; perhaps someone else on the list can
find the time to help this guy.

-- Rob

----- Forwarded message from nedunuri ramakrishna <nedunuri_rk at yahoo.com> -----

Date: Fri, 26 Apr 2002 23:12:30 -0700 (PDT)
From: nedunuri ramakrishna <nedunuri_rk at yahoo.com>
Subject: Re: Help
To: Robert Belleman <robbel at science.uva.nl>
In-Reply-To: <20020425121524.A19509 at carol.wins.uva.nl>

Dear Robert,

 I am getting Image and rendering.I want clear image
means opacity and color effect where I have to
adjust.Because I am getting white image totally.Not
clear that much whcih is showing in volview.Please
help me what values I have to make changes.It should
display in grey color.


renderer =vtkRenderer::New();
	renWin = vtkRenderWindow::New();
	renWin->AddRenderer(renderer);
	renWin->SetParentId(m_hWnd);
	iren =vtkRenderWindowInteractor::New();
	iren->SetRenderWindow(renWin);
vtkVolume16Reader *reader=vtkVolume16Reader::New();
	reader->SetDataByteOrderToLittleEndian();

reader->SetFilePrefix("C:\\DicomFiles\\DownLoad\\xyz\\");
   
	reader->SetFilePattern("%s%d.raw");    
	reader->SetImageRange(1,93);
	reader->SetDataDimensions(128,128);
	reader->SetDataSpacing(1,1,1);
	reader->SetDataMask(0x7fff);
	
    vtkImageGaussianSmooth 
*gaussian=vtkImageGaussianSmooth::New();
    gaussian->SetStandardDeviations(1.0,1.0,1.0);
    gaussian->SetRadiusFactors(1.0,1.0,1.0);
    gaussian->SetInput(reader->GetOutput());
    
// Create transfer mapping scalar value to opacity
  vtkPiecewiseFunction
*opacityTransferFunction=vtkPiecewiseFunction::New();
  opacityTransferFunction->AddPoint(0,0.259);
  opacityTransferFunction->AddPoint(64,63535);
  opacityTransferFunction->AddPoint(128,1.0);
  
//# Create transfer mapping scalar value to color
vtkColorTransferFunction
*colorTransferFunction=vtkColorTransferFunction::New();
colorTransferFunction->AddRGBPoint(0.0,0.0,0.0,0.0);
colorTransferFunction->AddRGBPoint(63.0,0.259,0.259,0.3);
 
colorTransferFunction->AddRGBPoint(127.0,1.0,1.0,0.3);
 
//# The property describes how the data will look
  vtkVolumeProperty
*volumeProperty=vtkVolumeProperty::New();
  volumeProperty->SetColor(colorTransferFunction);
 
volumeProperty->SetScalarOpacity(opacityTransferFunction);
  volumeProperty->SetAmbient(0.01);
  volumeProperty->SetDiffuse(0.50);
  volumeProperty->SetSpecular(0.48);
  volumeProperty->SetSpecularPower(100);
  volumeProperty->ShadeOn();
  vtkFiniteDifferenceGradientEstimator
*gst=vtkFiniteDifferenceGradientEstimator::New();

vtkVolumeRayCastCompositeFunction 
*compositeFunction=vtkVolumeRayCastCompositeFunction::New();
 vtkVolumeRayCastMapper
*volumeMapper=vtkVolumeRayCastMapper::New();
  volumeMapper->SetGradientEstimator(gst);
 
volumeMapper->SetVolumeRayCastFunction(compositeFunction);
  volumeMapper->SetInput(gaussian->GetOutput());
//# The volume holds the mapper and the property and
//# can be used to position/orient the volume
   vtkVolume *volume=vtkVolume::New();
   volume->SetMapper(volumeMapper);
   volume->SetProperty(volumeProperty);
   renderer->AddVolume(volume);
   renWin->Render();
}

Regards,
Ramakrishna





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----- End forwarded message -----

-- 
[] Robert Belleman         X  Section Computational Science            []
[] robbel at science.uva.nl  |X| University of Amsterdam, the Netherlands []
[] tel: (+31) 20 525 7510  X  http://www.science.uva.nl/~robbel/       []