[vtkusers] VolumePro support is NOT any better ... Why???

[Lisa S. Avila]

Hello Kevin,

Your 300MB data set may be bigger than can fit in memory on your VolumePro 
500 board. This may be why interaction is so slow. You may see better 
performance in VolView because a multi-resolution strategy is used, even 
for the VolumePro. In VTK, the vtkVolumeRayCaster (which does not use the 
VolumePro) will use a mutli-resolution strategy by default, which will 
provide interaction with a loss of image quality. When using the 
vtkVolumeProMapper you have to explicitly create your multiple levels of 
resolution.

Lisa


At 10:16 AM 12/2/02, Kevin Tiow Wee TAN wrote:
>Hello,
>How are you?
>
>Just wondering if any one have tried to use VolumePro support with
>vtk-Java wrapping.
>
>My experience with VolumePro is not looking good at all. I tried it on
>VG500, the dataset volume (only about 300Mb) hardly even move at all,
>when I tried to rotate.  I tried my program on another machine with
>VP1000 card installed, it is better (as least the model move), but it is
>not better than without using VolumePro support.
>
>WITHOUT volumePro support, I used vtkVolumeRayCastMapper is actually
>perform better than I used vtkVolumeProMapper, which I expect better
>performance from the VolumePro cards.
>
>I did tried to use volumeProMapper.PrintSelf(), and it is confirm that
>vtk detected both VolumePro cards repectively.  My Java-VTK application
>is not perform any better or worst than using vtkVolumeRayCastMapper (I
>suppose this is without VolumePro card support)
>
>I tried to use VolView, it is obviously better with the VolumePro card
>installed...
>
>Any idea, why??? Any advice would be appreciated...
>
>Please find my code with VolumePro support as following:
>
>/********************/
>vtkRenderer ren1 = new vtkRenderer();
>ren1.SetBackground(0., 0., 0.);
>ren1.GetActiveCamera().ParallelProjectionOn();
>ren1.GetActiveCamera().SetParallelScale(40.0);
>
>vtkRenderWindow renWin = new vtkRenderWindow();
>renWin.AddRenderer(ren1);
>renWin.SetSize(600,600);
>renWin.SetPosition(300, 0);
>
>vtkRenderWindowInteractor iren = new vtkRenderWindoInteractor();
>iren.SetRenderWindow(renWin);
>iren.SetDiresiredUpdateRate
>
>vtkImageReader reader = new vtkImageReader();
>reader.SetFileName(fileName);
>reader.SetDataExtend(0, xSize-1, 0, ySize-1, 90, zSieze-1);
>reader.SetFileDimensionality(3);
>reader.SetHeaderSize(0);
>reader.SetDataByteOrderToLittleEndian();
>reader.SetDataScalarTypeToUnsignedChar();
>reader.SetDataSpacing(vSize, vSize, vSize);
>reader.GetOutput().ReleaseDataFlagOn();
>
>vtkPiecewiseFunction opacityTransferFunction = new
>vtkPiecewiseFunction();
>opacityTransferFunction.AddPoint(20., 0.0);
>opacityTransferFunction.AddPoint(255., 0.5);
>
>vtkColorTransferFunction colorTransferFunction = new
>vtkColorTransferFunction();
>colorTransferFunction.AddRGBPoint (  0.0, 0.0, 0.0, 0.0 );
>colorTransferFunction.AddRGBPoint ( 64.0, 1.0, 0.0, 0.0 );
>colorTransferFunction.AddRGBPoint (128.0, 0.0, 0.0, 1.0 );
>colorTransferFunction.AddRGBPoint (192.0, 0.0, 1.0, 0.0 );
>colorTransferFunction.AddRGBPoint (255.0, 0.0, 0.2, 0.0 );
>
>vtkVolumeProperty volumeProperty = new vtkVolumeProperty();
>volumeProperty.SetColor ( colorTransferFunction );
>volumeProperty.SetScalarOpacity(opacityTransfer);
>volumeProperty.ShadeOff();
>
>vtkVolumeProMapper volumeMapper = new vtkVolumeProMapper();
>volumeMaper.SetInput(reader.GetOutput());
>
>vtkVolume volume = new vtkVolume();
>volume.SetMapper (volumeMapper);
>volume.SetProperty (volumeProperty);
>
>ren1.AddVoluem(volume);
>
>renWin.Render();
>iren.Start();
>
>/**********************/
>
>--
>Thanks
>Kevin
>**********************************
>Manchester Material Science Centre
>University of Manchester
>----------------------------------
>Centre for Virtual Environments
>University of Salford
>**********************************
>_______________________________________________
>This is the private VTK discussion list.
>Please keep messages on-topic. Check the FAQ at: 
><http://public.kitware.com/cgi-bin/vtkfaq>
>Follow this link to subscribe/unsubscribe:
>http://public.kitware.com/mailman/listinfo/vtkusers