[vtkusers] using vtkVolumeRayCastMapper to render vtkSampleFunction

[Patrick de Koning]

Wolfram H Volpi wrote:
> 
> Hi, everybody!
> I'm trying to rayCast-render a volume generated by vtkSampleFunction.
> It doesn't work because,
> 
> vtkVolumeRayCastMapper (0x80c9ef8): The scalar data type: 10 is not
> supported when volume rendering. Please convert the  data to unsigned
> char or unsigned short.
> 
> How do I do that?
> 

vtkImageCast

> The problem code is listed below.  It makes my PC go into virtual
> memeory.  My PC has 250 MB of RAM.
> 
> Thank you,
> Woflv.
> -------------------------------------------------------------------------------
> source $VTK_TCL/vtkInt.tcl
> 
> # goes into virtual memeory!
> vtkSphere sphere
>     sphere SetRadius 1
> 
> vtkSampleFunction sample
>     sample SetImplicitFunction sphere
> 
> vtkVolumeProperty volumeProperty
>     volumeProperty SetInterpolationTypeToNearest
> 
> vtkVolumeRayCastMIPFunction  MIPFunction
> 
> vtkVolumeRayCastMapper volumeMapper
>     volumeMapper SetInput [sample GetOutput]
>     volumeMapper SetVolumeRayCastFunction MIPFunction
>     volumeMapper SetSampleDistance 0.25
> 
> vtkVolume volume
>     volume SetMapper volumeMapper
>     volume SetProperty volumeProperty
> 
> # graphics stuff
> vtkRenderer ren1
>     ren1 SetBackground 0.1 0.2 0.4
> vtkRenderWindow renWin
>     renWin AddRenderer ren1
>     renWin SetSize 256 256
> vtkRenderWindowInteractor iren
>     iren SetRenderWindow renWin
> 
> ren1 SetBackground 0 0 0
> 
> ren1 AddVolume volume
> renWin SetSize 200 200
> renWin Render
> 
> iren SetUserMethod {wm deiconify .vtkInteract}
> iren SetDesiredUpdateRate 1
> iren Initialize
> 
> wm withdraw .
> 
> _______________________________________________
> 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

-- 
--------------------------------------------------------------------
Ir. P.J.H. de Koning                    Leiden University Medical Center
Department of Radiology, C2S            Division of Image Processing
P.O. Box 9600                           2300 RC  LEIDEN
the Netherlands                         Tel. +31-71-5266206  
Fax +31-71-5266801                      Email patrick at lkeb.azl.nl