I am in the process of building a landscape.  I am using a USGS Dem image 
for my heightfield. I there an easier way to determine the "y" value knowing 
the "x" and "z" other than trial and error? Some objects are fencelines 
built from spline curves. With the number of points needed for these curves, 
the job becomes time intensive doing it by trial and error.
Thanks in advance, Dennis

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