[vtkusers] vtkimagereslicemapper to get exact slice

[David Gobbi]

Hi Chasan,

Yes, the problem is that JumpToNearestSlice only works if
SliceAtFocalPoint is on.  That's what the documentation says.

So in order to avoid interpolation between slices, you will have
to make sure that Origin of your slice plane always lies exactly
on one of the slices in your data set.

  David

On Thu, Mar 13, 2014 at 10:20 AM, chasank <chasank at gmail.com> wrote:
> Hi,
>
> Here is my code. I suspect that it is not working because of
> SliceAtFocalPoint being off. Also, I traverse among slices by changing
> planes -not using camera.
>
> void Display(vtkImageData *imageData, vtkRenderer *renderer, vtkImageStack
> *imageStack, int layerIndex, ORIENTATION_TYPE orientationType) {
>     double spacing[3];
>     roiImageData->GetSpacing(spacing);
>
>     imageResliceMapper->SetInputData(roiImageData);
>     imageResliceMapper->SliceFacesCameraOff();
>     *imageResliceMapper->SliceAtFocalPointOff();*
>     imageResliceMapper->JumpToNearestSliceOn();
>     imageResliceMapper->SetImageSampleFactor(2);
>     imageResliceMapper->BorderOn();
>     imageResliceMapper->BackgroundOn();
>     imageResliceMapper->UpdateInformation();
>     imageResliceMapper->GetSlicePlane()->SetOrigin(basePlane->GetOrigin());
>     imageResliceMapper->GetSlicePlane()->SetNormal(basePlane->GetNormal());
>     imageResliceMapper->GetSlicePlane()->Modified();
>     imageResliceMapper->Modified();
>
>     double window = 1;
>     double level = 0.5;
>
>     lookupTable = TMDSmartPointer< vtkLookupTable >::New();
>     lookupTable->SetNumberOfTableValues(2);
>     lookupTable->Build();
>     lookupTable->SetTableValue(0, 0.0, 0.0, 0.0, 0.0);
>     lookupTable->SetTableValue(1, 1.0, 0.0, 0.0, 1.0);
>
>     imageProperty->SetLayerNumber(layerIndex);
>     imageProperty->SetColorLevel(level);
>     imageProperty->SetColorWindow(window);
>     imageProperty->SetLookupTable(lookupTable.GetPointer());
>     imageProperty->SetInterpolationTypeToLinear();
>     imageProperty->SetAmbient(1.0);
>     imageProperty->SetDiffuse(1.0);
>     imageProperty->SetOpacity(0.4);
>
>     imageSlice->SetMapper(imageResliceMapper);
>     imageSlice->SetProperty(imageProperty);
>     imageSlice->Update();
>     imageStack->AddImage(imageSlice);
>     imageStack->Update();
> }
>
> Best regards,
> Chasan
>
>
>
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