[vtkusers] Decode gradient normals

[W. John]

Hello,
    I'm doing some experiments and changes to the VTK's CastRay function (file vtkVolumeRayCastCompositeFunction.cxx).  In one of the experiments I would like to do, I need to get the actual direction of each voxel's gradient.
   My question is, how can I convert(decode) the staticInfo->EncodedNormals to get the actual direction computed at vtkFiniteDifferenceGradientEstimator.cxx? (i.e. n[0], n[1], n[2])
 
 Thanks in advance.
 --John

		
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