<html>
  <head>

    <meta http-equiv="content-type" content="text/html; charset=utf-8">
  </head>
  <body bgcolor="#FFFFFF" text="#000000">
    Hello:<br>
        I use vtk 4 before, last week, i install vtk 6, it's looks like
    some class and function changed. I write a simple code, read dicom
    and display, it's can run success before i update the vtk to 6:<br>
        <br>
        //read dicom<br>
        vtkDICOMImageReader   *reader =  vtkDICOMImageReader::New();<br>
        reader->SetDataByteOrderToLittleEndian();<br>
        reader->SetDirectoryName(path.c_str());<br>
        reader->SetDataOrigin(0.0, 0.0, 0.0);<br>
        <br>
        //store in the vtkImageData<br>
        vtkSmartPointer<vtkImageData> imageData =
    vtkSmartPointer<vtkImageData>::New();<br>
        imageData = reader->GetOutput();<br>
        <br>
        //i think here has problem, because gdb show bug here<br>
        vtkImageCast *cast = vtkImageCast::New();<br>
        cast->SetInputData(imageData);<br>
        cast->ClampOverflowOn();<br>
        cast->SetOutputScalarTypeToUnsignedShort();<br>
        <br>
        vtkPiecewiseFunction *opacityTransferFunction =
    vtkPiecewiseFunction::New();<br>
        opacityTransferFunction->RemoveAllPoints();<br>
        opacityTransferFunction->AddPoint(0, 0.0);<br>
        opacityTransferFunction->AddPoint(255, 1);<br>
    <br>
        vtkColorTransferFunction *colorTransferFunction =
    vtkColorTransferFunction::New();<br>
        colorTransferFunction->RemoveAllPoints();<br>
        colorTransferFunction->AddRGBPoint(0.0, 0.0, 0.0, 0.0);<br>
        colorTransferFunction->AddRGBPoint(255, 1.0, 1.0, 1.0);<br>
    <br>
        vtkVolumeProperty *volumeProperty = vtkVolumeProperty::New();<br>
        volumeProperty->SetColor(colorTransferFunction);<br>
        volumeProperty->SetScalarOpacity(opacityTransferFunction);<br>
        volumeProperty->ShadeOn();<br>
        volumeProperty->SetInterpolationTypeToLinear();<br>
    <br>
        vtkVolumeRayCastCompositeFunction *compositeFunction =
    vtkVolumeRayCastCompositeFunction::New();<br>
        vtkVolumeRayCastMapper *volumeMapper =
    vtkVolumeRayCastMapper::New();<br>
        volumeMapper->SetVolumeRayCastFunction(compositeFunction);<br>
        volumeMapper->SetInputData(cast->GetOutput());<br>
        <br>
        vtkVolume *volume = vtkVolume::New();<br>
        volume->SetMapper(volumeMapper);    <br>
        volume->SetProperty(volumeProperty);<br>
    <br>
        vtkCamera *aCamera = vtkCamera::New();<br>
        aCamera->SetViewUp (0, 0, -1);<br>
        aCamera->SetPosition (0, 1, 0);<br>
        aCamera->SetFocalPoint (0, 0, 0);<br>
        aCamera->ComputeViewPlaneNormal();<br>
        aCamera->Dolly(1.0);<br>
            <br>
        vtkRenderer *renderer = vtkRenderer::New();  <br>
        renderer->RemoveAllViewProps();<br>
        renderer->AddVolume(volume);<br>
        renderer->SetActiveCamera(aCamera);<br>
        renderer->SetBackground( 0,0,0 );<br>
        renderer->ResetCamera ();<br>
        //renderer->Render();<br>
    <br>
        vtkRenderWindow *renWin = vtkRenderWindow::New();<br>
        renWin->AddRenderer(renderer);<br>
        renWin->SetSize(500, 500);<br>
        renWin->Start();<br>
        renWin->Render();  // gdb show the bug occur<br>
    <br>
        vtkRenderWindowInteractor *iren =
    vtkRenderWindowInteractor::New();<br>
        iren->SetRenderWindow(renWin);<br>
        iren->Initialize();<br>
        iren->Start();<br>
        <br>
    <u><big>the gdb show:</big></u><br>
    [New Thread 0x7fffe1385700 (LWP 4012)]<br>
    [Thread 0x7fffe1385700 (LWP 4012) exited]<br>
    [New Thread 0x7fffe1385700 (LWP 4013)]<br>
    [Thread 0x7fffe1385700 (LWP 4013) exited]<br>
    [New Thread 0x7fffe1385700 (LWP 4014)]<br>
    [Thread 0x7fffe1385700 (LWP 4014) exited]<br>
    <br>
    X Error of failed request:  BadMatch (invalid parameter attributes)<br>
      Major opcode of failed request:  156 (GLX)<br>
      Minor opcode of failed request:  11 (X_GLXSwapBuffers)<br>
      Serial number of failed request:  687<br>
      Current serial number in output stream:  687<br>
    [Inferior 1 (process 4006) exited with code 01]<br>
    <br>
    <br>
    <br>
    I dont kown what the difference between the vtk 6 and vtk 4, greate
    appreciates for anyone's reply!<br>
    <br>
    <br>
        <br>
  </body>
</html>