[vtkusers] How to acces to gradient data in a volume mapper

[tuo zhang]

Hi,
Have you tried calling Update() before you
GetGradient?


--- vincent elkouby <vincent_elkouby at yahoo.fr>:

> Hello,
> 
> some one does know how to access to gradient data in
> a vtkVolume Mapper?
> 
> I use a vtkFixedPointVolumeRayCastMapper. This class
> compute the volume gradient to render the volume.
> But I would like to access to the gradient data to
> filter it. There is to methods to get attributes
> from this class named: 
> 
>       unsigned short
> **gradNormal=volMapper->GetGradientNormal();
>       unsigned char **grad      
> =volMapper->GetGradientMagnitude();
> 
> But it's doesn't work or I don't know how it works.
> The both pointers are null.
> 
> PS: My soft is working.
> 
> 
> 
>      
>
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