[vtkusers] Color Mapping Gradients

[Lindsey McAninch]

Ok, so here is my problem, if you know the answer please 
be very explicit as I am fairly new to VTK and really need 
things spelled out.

I am using marching cubes to render some ct data of the 
cervical spine, C1 to be specific.  I want to visualize 
the gradients, or the magnitude of the gradients as a 
color map on the rendering.  I notice there is a 
ComputeGradients method and GetComputeGradients method in 
the marching cubes, but I am clueless as to how I should 
go about connecting it all together and using a look up 
table.  I also want to be able to take a portion of my 
image and determine the average gradient within that small 
portion to get an idea of the curvature in specific areas 
of the bone.  I don't know how to do this either.  If 
anyone has examples of setting up lookup tables and 
getting a color mapping of this kind of data or could help 
me, I would really appreciate it.  Thank you so much in 
advance.  

Lindsey Healy
University of Utah
Undergraduate
Department of Bioengineering
50 S. Central Campus Dr. 
Salt Lake City, UT 84112