[vtkusers] Can't figure out the reslice

[Doug Hoppes]

Okay, I'm not sure what I'm missing here.  I was able to read my image
in and I thought that I was creating a slice that was at 45 degrees to
the entire volume (cut the entire volume diagonally).  However, the only
thing that seems to be happening is that I'm taking the topmost layer of
the volume and rotating it by 45 degrees.  

 

Any help is greatly appreciated.

 

Doug

-----------------

 

// Read the image data file

vtkSmartPointer<vtkTIFFReader> pReader =
vtkSmartPointer<vtkTIFFReader>::New();

pReader->SetFilePrefix("TestImages\\sample\\test_");

pReader->SetFilePattern("%s%03d.tif");

pReader->SetDataScalarTypeToUnsignedChar();

pReader->SetNumberOfScalarComponents(3);

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

pReader->SetDataSpacing(1,1,1);

pReader->SetFileLowerLeft(0);

pReader->SetDataExtent(0, 246, 0, 174, 0, 25);

 

// Define the axis and what type of orientation for the slice to display

AxisDirection eAxis = Multi;

double dAngle = 45;

double dAngleInRadians = dAngle * (PI/180.0);

 

// Create the reslice object

vtkSmartPointer<vtkImageReslice> pImageSlice =
vtkSmartPointer<vtkImageReslice>::New();

pImageSlice->SetResliceAxesOrigin(0, 0, 0);

pImageSlice->SetResliceAxesDirectionCosines(cos(dAngleInRadians),
-sin(dAngleInRadians), 0.0,

                                            sin(dAngleInRadians),
cos(dAngleInRadians),  0.0,

                                            0.0,                  0.0,
1.0);

 

// Extract a slice in the desired orientation

pImageSlice->SetInputConnection(pReader->GetOutputPort());

pImageSlice->SetOutputDimensionality(2);

pImageSlice->SetInterpolationModeToLinear();

 

// Create the actor

vtkSmartPointer<vtkImageActor> pImageActor =
vtkSmartPointer<vtkImageActor>::New();

pImageActor->SetInput(pImageSlice->GetOutput());

pImageActor->SetPosition(0,0,0);

 

// Add Actor to renderer

pRenderer->AddViewProp(pImageActor);

 

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