OK, so due to the extreme difficulty of employing bicubic_patch objects for
this,

{issues I've run into are
- the sometimes extreme disparity between control points and patch surface
coordinates,
- Somehow trace does not hit the edge of the patch when a ray is shot straight
down at the patch in the y direction from far above a control point
- inability to get accurate min and max extent
- extremely difficult to determine control points from data points on the curve
}

I've reimagined this whole thing, and of course the first stumbling block I got
to was:

If I read all the data in from the file, then render the first frame,
what will happen is that upon rendering the 2nd frame, the data gets read in
AGAIN, over and over and over.

Any ideas for fixes for this?
This looks like the ole' Persistence of Data across frames problem.
"POV needs POD!"

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