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<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>Hi,<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>I’m trying to display
a 2D image (that has a certain thickness) as a 3D volume, visualizing the
thickness of the image as well. However I seem to be unable to get anything
displayed. I’ve tried the following (note that this code does work with
data sets that have image->GetDimensions()[2] > 1):<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> vtkImageData *image =
...;<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> <font color=black><span
style='color:black'>vtkPiecewiseFunction</span></font> *<font color=black><span
style='color:black'>opacityTransferFunction</span></font> = <font color=black><span
style='color:black'>vtkPiecewiseFunction</span></font>::<font color=black><span
style='color:black'>New</span></font> ();<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> <font color=black><span
style='color:black'>opacityTransferFunction</span></font>-><font
color=black><span style='color:black'>AddPoint</span></font> ( 0, 1.0 );<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> <font color=black><span
style='color:black'>opacityTransferFunction</span></font>-><font
color=black><span style='color:black'>AddPoint</span></font> ( 255, 1.0 );<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> <font color=black><span
style='color:black'>vtkColorTransferFunction</span></font> *<font color=black><span
style='color:black'>colorTransferFunction</span></font> = <font color=black><span
style='color:black'>vtkColorTransferFunction</span></font>::<font color=black><span
style='color:black'>New</span></font> ();<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> <font color=black><span
style='color:black'>colorTransferFunction</span></font>-><font color=black><span
style='color:black'>AddRGBPoint</span></font> ( 0, 0.0, 0.0, 0.0 );<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> <font color=black><span
style='color:black'>colorTransferFunction</span></font>-><font color=black><span
style='color:black'>AddRGBPoint</span></font> ( 255, 1.0, 1.0, 1.0 );<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> <font color=black><span
style='color:black'>vtkVolumeProperty</span></font> *<font color=black><span
style='color:black'>volumeProperty</span></font> = <font color=black><span
style='color:black'>vtkVolumeProperty</span></font>::<font color=black><span
style='color:black'>New</span></font> ();<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> <font color=black><span
style='color:black'>volumeProperty</span></font>-><font color=black><span
style='color:black'>SetColor</span></font> ( <font color=black><span
style='color:black'>colorTransferFunction</span></font> );<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> <font color=black><span
style='color:black'>volumeProperty</span></font>-><font color=black><span
style='color:black'>SetScalarOpacity</span></font> ( <font color=black><span
style='color:black'>opacityTransferFunction</span></font> );<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> <font color=black><span
style='color:black'>vtkVolumeRayCastCompositeFunction</span></font> *<font
color=black><span style='color:black'>rayCastFunction</span></font> = <font
color=black><span style='color:black'>vtkVolumeRayCastCompositeFunction</span></font>::<font
color=black><span style='color:black'>New</span></font> ();<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=green
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:green'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> <font color=black><span
style='color:black'>vtkVolumeRayCastMapper</span></font> *<font color=black><span
style='color:black'>volumeMapper</span></font> = <font color=black><span
style='color:black'>vtkVolumeRayCastMapper</span></font>::<font color=black><span
style='color:black'>New</span></font> ();<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> <font color=black><span
style='color:black'>volumeMapper</span></font>-><font color=black><span
style='color:black'>SetInput</span></font> ( <font color=black><span
style='color:black'>image</span></font> );<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> <font color=black><span
style='color:black'>volumeMapper</span></font>-><font color=black><span
style='color:black'>SetVolumeRayCastFunction</span></font> ( <font color=black><span
style='color:black'>rayCastFunction</span></font> );<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> <font color=black><span
style='color:black'>vtkVolume</span></font> *<font color=black><span
style='color:black'>volume</span></font> = <font color=black><span
style='color:black'>vtkVolume</span></font>::<font color=black><span
style='color:black'>New</span></font> ();<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> <font color=black><span
style='color:black'>volume</span></font>-><font color=black><span
style='color:black'>SetProperty</span></font> ( <font color=black><span
style='color:black'>volumeProperty</span></font> );<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'> <font color=black><span style='color:black'>volume</span></font>-><font
color=black><span style='color:black'>SetMapper</span></font> ( <font
color=black><span style='color:black'>volumeMapper </span></font>);<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'>It seems like a very basic problem, so hopefully
someone can point out my error.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'>best,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'>Jeroen<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
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