[vtkusers] [VtkEdge] vtkColorTransferFunction of lungs

[Lisa Avila]

Hello Wassim,

Are you trying to view the lungs as a surface, or transparently? I 
assume your data is CT?

The best way to "find" a good transfer function is with an interactive 
GUI for adjusting transfer function nodes. You could try downloading the 
trial version of VolView 3 from the Kitware web site, adjust the 
transfer function interactively until you find a good one, then copy out 
the node values into your program. That is what I almost always do when 
I have to do a task like this - there is usually enough variation in 
scan parameters that you can't really say "this hardcoded function will 
be the best to show lungs in all CT data". Would be nice if that worked. :-)

If you are still having problems after trying something interactive to 
help you, let me know.

Lisa


wassim_belhadj at topnet.tn wrote:
> Hi,
>
> I'm using VTk/VTKEdge for lungs Volume rendering.
>
> My problem is that I have not found the appropriate
> vtkColorTransferFunction of lungs. 
>
> Most of the examples provide vtkColorTransferFunction and 
> vtkPiecewiseFunction functions of muscles, bones, skin but not lungs.
>
> Bellow my transfer function that I used to display Lungs.
>
> 	opacityFun->AddPoint(-960,0.0);
> 	opacityFun->AddPoint(-950, 1.0);
>          opacityFun->AddPoint(-550,1.0 );
> 	opacityFun->AddPoint(-500,0.3 );
> 	opacityFun->AddPoint(-450, 0.0);
> 	opacityFun->AddPoint(-300, 0.0);
> 	
> Can someone HELP ME?
>
> Best regards,
> wassim
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