[vtkusers] View vector in raycasting

[Alark Joshi]

Hello,

I am trying to access the view vector in the 
vtkVolumeRayCastCompositeFunction to take the dot product of the view vec 
with the gradient direction (staticinfo->encoded normals). I dont know how 
to access the view vector here though. Please could someone tell me how to 
do this or point me to an example?  Thanks.

Regards,

Alark