[vtkusers] subtract volume depending on the scalar values

[Jianlong Zhou]

HI, all,

My problem is like this: I have a data set with scalar values from 0 to 65535. My interested 
objects of this data range from 63400 to 63800. Now I want to extract the data from 63400 
to 63800 and map these values to the new range of 0 to 255 and save this results to a new 
data set.

How to do this process?

Thanks in advance.

Jianlong


> you can define a function
> 
> vtkPiecewiseFunction * opacityTransferFunction    = 
> vtkPiecewiseFunction::New();
>           opacityTransferFunction->AddPoint(     0, 0.0 );
>           opacityTransferFunction->AddPoint( 199, 0.0 );
>           opacityTransferFunction->AddPoint( 200, 1.0 );
>           opacityTransferFunction->AddPoint( 255, 1.0 );
> 
> and  then you only save 1s
> 
>    Andres


> >Hi, all,
> >
> >I want to extract a subvolume (sub-scalar range not sub-region range)
> >depending on the scalar range, e.g. I want to extract a CT volume and only
> >extract the scalar value between 200 and 255 and save the extracted
> >volume data in this range in another raw file. Would anyone tell me how to
> >do this?
> >
> >Thank you inadvance.
> >
> >Jianlong
> >_______________________________________________
> >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
> 
> _________________________________________________________________
> Add photos to your messages with MSN 8. Get 2 months FREE*.  
> http://join.msn.com/?page=features/featuredemail
>