[vtkusers] Re: how to access 3D volume

[Ravi Samala]

hi Rathore,
 
may be my question is not that clear, after loading the 3D volume from 2D slices using vtkVolume16Reader, I want to access individual slices to perform filtering operation (on a slice-by-slice basis).
 
(Put it in other way, I need to extract a single slice from the 3Dvolume image (from the v16Img object) , -- how can I do that?)
 
thank you,
Ravi.


Divya Rathore <divyaksr at iitk.ac.in> wrote:
Search in the examples directory if you are using the source code of VTK.
If you are using the binary (installable) version then also it is a matter of a simple file searching.
 
Windows/Linux?

----- Original Message ----- 
From: Ravi Samala 
To: vtkusers at vtk.org 
Sent: Tuesday, October 04, 2005 10:00 PM
Subject: Re: [vtkusers] Re: how to access 3D volume


hi Rathore,
 
I am kind of new to VTK, can you tell me where can I find ImagePlaneWidget.cpp file.
 
thank you,
 
Ravi

Divya Rathore <divyaksr at iitk.ac.in> wrote:
Check out ImagePlaneWidget.cpp (I would like to thank Dr. Nagarajan, raman_nagarajan at vsnl.net, a member of this list).
 
regards,
D. Rathore
----- Original Message ----- 
From: Ravi Samala 
To: vtkusers at vtk.org 
Sent: Monday, October 03, 2005 7:02 PM
Subject: [vtkusers] how to access 3D volume


hi vtkusers,
 
 I am reading 2D slices and constructing a 3D volume, using the following code....
 

vtkVolume16Reader *v16Img = vtkVolume16Reader::New();

v16Img->SetDataDimensions (sizex,sizey);

v16Img->SetImageRange (atoi(argv[3]),atoi(argv[4])); 

v16Img->SetHeaderSize(HeadS);

v16Img->SetFilePrefix (argv[2]); 

v16Img->SetDataSpacing (0.1, 0.1, 0.5);

v16Img->SetDataOrigin(0, 0, 0);

cout<<"Image Volume Read...."<<endl;

 



//CompositeFunction with option

vtkVolumeRayCastCompositeFunction *compositeFunction = vtkVolumeRayCastCompositeFunction::New();

compositeFunction->SetCompositeMethodToInterpolateFirst(); 

 

//Mapper with selected RayCastFunction

vtkVolumeRayCastMapper *volumeMapper = vtkVolumeRayCastMapper::New();

volumeMapper->SetInput(v16Img -> GetOutput());

volumeMapper->SetVolumeRayCastFunction(compositeFunction);

 

// Create transfer mapping scalar value to opacity

vtkPiecewiseFunction *pieceFunc = vtkPiecewiseFunction::New();

pieceFunc->AddPoint(0, 0.0); // alpha value for the lower intensity limit

pieceFunc->AddPoint(15000, 0.5); // alpha value for the upper intensity limit

 

//Set Volume Property

vtkVolumeProperty *volumeProperty = vtkVolumeProperty::New();

volumeProperty->SetInterpolationTypeToLinear();

volumeProperty->SetScalarOpacity(pieceFunc);

volumeProperty->ShadeOn();

 

//The special actor with properties

vtkVolume *vol = vtkVolume::New();

vol->SetMapper(volumeMapper);

vol->SetProperty(volumeProperty);

 

// An outline provides context around the data.

vtkOutlineFilter *outlineData = vtkOutlineFilter::New();

outlineData->SetInput((vtkDataSet *) v16Img->GetOutput());

vtkPolyDataMapper *mapOutline = vtkPolyDataMapper::New();

mapOutline->SetInput(outlineData->GetOutput());

vtkActor *outline = vtkActor::New();

outline->SetMapper(mapOutline);

outline->GetProperty()->SetColor(0,0,0); 



 

//Starting to Render

vtkRenderer *renderer=vtkRenderer::New();

renderer->AddVolume(vol); 

renderer->SetBackground(1,1,1);

 

vtkRenderWindow *renWin=vtkRenderWindow::New();

renWin->SetSize(500,500);

renWin->DoubleBufferOn(); 

renWin->AddRenderer(renderer);



vtkRenderWindowInteractor *iren=vtkRenderWindowInteractor::New();

iren->SetRenderWindow(renWin);

iren->Initialize(); 

iren->Start();

 

my question is : is there any way I can access individual slices and a point in the 3 dimensional space (like p(x,y,z).

 

thanks in advance,

 

Ravi.



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Click here to donate to the Hurricane Katrina relief effort. 

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 Click here to donate to the Hurricane Katrina relief effort. 
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