

So, I managed to muster enough motivation to doggedly pursue implementing the
user_defined camera approach to modeling lens aberrations with Zernike
polynomials.
At present, I'm attempting to do that using  derivatives of the polar
equations. (Not at all sure I'm doing it right)
Anyway, the point is, that after fiddling a bit with the location and direction
parametric equations, POVRay suddenly decided to start partialrendering my
scene with some bad 8bit blocky censorship.
Sometimes it's fairly evenly distributed across the whole image, other times
it's only in the top half....
This leads to speculate that:
1. There's something wrong with my build (3.8 beta windows executable)
2. There's potentially something wrong with my (computer) memory :P
3. There exists some sort of statedependent bug in the user_defined camera code
I'm going to try to work everything out in Cartesian coordinates and see if
maybe that might behave better, plus I'll be a lot more confident about the
derivatives and the resulting normal vector I'll be using for the direction {}
If that fails, I'll try restarting POVRay, and perhaps shutting down until I
get back in from this evening's exciting warehouse work adventure.
 BW
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