[vtkusers] Java EXCEPTION_ACCESS_VIOLATION

[Divye]

Hi All,

I am trying to run a program for 3d rendering of DICOM images , using java on win vista 32 - bit using vtk 5.4.2 and am getting the following EXCEPTION_ACCESS_VIOLATION.

An unexpected error has been detected by Java Runtime Environment:
#
#  EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x59bf3b3f, pid=27652, tid=27836
#
# Java VM: Java HotSpot(TM) Client VM (1.6.0-b105 mixed mode, sharing)
# Problematic frame:
# C  [vtkVolumeRendering.dll+0x313b3f]
#
# An error report file with more information is saved as hs_err_pid27652.log
#
# If you would like to submit a bug report, please visit:
#   http://java.sun.com/webapps/bugreport/crash.jsp

Looks like a memory leak somewhere but am not able to figure out where it is.

Here is the main class : 

import vtk.*;

public class WrapperVtkRenderVolume {
    
    vtkRenderer renderer = new vtkRenderer();
    vtkRenderWindow renderWindow = new vtkRenderWindow();
    vtkRenderWindowInteractor renInteractor = new vtkRenderWindowInteractor();
    vtkImageData imageData = new vtkImageData();
    vtkPiecewiseFunction opacityTransferFunction = new vtkPiecewiseFunction();
    vtkVolumeProperty volumeProperty = new vtkVolumeProperty();
    vtkVolume volume = new vtkVolume();
    vtkVolumeTextureMapper3D volumeMapper = new vtkVolumeTextureMapper3D();
    vtkColorTransferFunction colorTransferFunction = new vtkColorTransferFunction();
    vtkFixedPointVolumeRayCastMapper volumeMapperSoftware = new vtkFixedPointVolumeRayCastMapper();

    public WrapperVtkRenderVolume(int width, int height) {
        ResetSize(width, height);
        SetupSceneBasics();
    }

    private void ResetSize(int width, int height) {
        
        renderWindow.SetSize(width, height);
        
    }

    private void SetupSceneBasics() {
        
        renderer.SetBackground(0, 0, 0);
        renderWindow.AddRenderer(renderer);
        renInteractor.SetRenderWindow(renderWindow);
        
    }

    public boolean LoadVolumeFromFolder(String strFolderPath) {
        
        vtkDICOMImageReader imageReader = new vtkDICOMImageReader();
        
        int channels = imageReader.GetNumberOfScalarComponents();
        
        if (channels == 1) {
            loadGrayScaleDataSet(imageReader.GetOutput());
            setupRendererMIP();
        } else {
            System.out.println("unsupported number of channels in dicom dataset");
            return false;
        }
        
        imageReader.Delete();
        renderer.ResetCamera();
        return true;
    }

    private boolean setupRendererMIP() {
        volumeProperty.SetColor(colorTransferFunction);
        volumeProperty.SetScalarOpacity(opacityTransferFunction);
        volumeProperty.SetInterpolationTypeToLinear();
        volumeProperty.ShadeOff();
        volume.SetProperty(volumeProperty);
        
        volumeMapperSoftware.SetInput(imageData);
        volumeMapperSoftware.SetSampleDistance(1.0);
        volumeMapperSoftware.SetBlendModeToMaximumIntensity();
        volume.SetMapper(volumeMapperSoftware);
        renderer.AddVolume(volume);
        return true;
        
    }

    private void loadGrayScaleDataSet(vtkImageData getOutput) {
        
        imageData.DeepCopy(getOutput);
        double initialWindow = imageData.GetScalarRange()[1] - imageData.GetScalarRange()[0];
        double initialLevel = initialWindow/2.0;
        VtkObserverWindowLevel observerWindowLevel = new VtkObserverWindowLevel(initialWindow, initialLevel, renInteractor, 
                opacityTransferFunction, colorTransferFunction);
        
        
    }

    public void Start() {
        renInteractor.Initialize();
        renInteractor.Start();
        
    }

}

the other class VtkObserverWindowLevel is :

import vtk.*;

public class VtkObserverWindowLevel {
    
    private vtkRenderWindowInteractor renInteractor;
    private vtkPiecewiseFunction opacityTransferFunction;
    private vtkColorTransferFunction colorTransferFunction;
    private double initialLevel;
    private double initialWindow;
    private int lastMouseY;
    private int lastMouseX;

    public VtkObserverWindowLevel(double initialWindow, double initialLevel,
            vtkRenderWindowInteractor renInteractor,
            vtkPiecewiseFunction opacityTransferFunction,
            vtkColorTransferFunction colorTransferFunction) {
        this.renInteractor = renInteractor;
        this.opacityTransferFunction = opacityTransferFunction;
        this.colorTransferFunction = colorTransferFunction;
        this.initialLevel = initialLevel;
        this.initialWindow = initialWindow;
        int lastMouseX = 0;
        int lastMouseY = 0;
        
        doWindowLevel();
    }

    private void doWindowLevel() {
int[] currPosition;
        
        currPosition = renInteractor.GetEventPosition();
        initialLevel -= (currPosition[1] - lastMouseY);
        initialWindow += (    currPosition[0] - lastMouseX);
        
        lastMouseX = currPosition[0];//current x
        lastMouseY = currPosition[1];//current y
        
        // Alter the color and opacity transfer functions 
        opacityTransferFunction.RemoveAllPoints();
        opacityTransferFunction.AddPoint(initialLevel - 0.5 * initialWindow, 0.0);
        opacityTransferFunction.AddPoint(initialLevel + 0.5 * initialWindow, 1.0);
        
        colorTransferFunction.RemoveAllPoints();
        colorTransferFunction.AddRGBSegment(initialLevel - 0.5 * initialWindow, 0.0, 0.0, 0.0,
                initialLevel + 0.5 * initialWindow, 1.0, 1.0, 1.0);
        
        // Re-render.
        renInteractor.Modified();
        renInteractor.Render();
        
    }

}


Can anyone please help me figuring out the cause.



      
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