> > Most likely the texture computations for the respective sphere sweeps
> > yield a result that is "Not a Number"

Maybe something like
#debug concat("<", vstr (5, ColorImage_Material_001, ",", 0, 3), ">\n")

would help identify the problem, except I don't know how to convert a UV pigment
identifier to a vector(?) so that you can monitor the results.

Christoph or someone else may know how to output the values/format of these
internal values to the debug stream.  If you're doing some sort of animation
with the .ini file, then I've found it useful to output the changing values to
screen.inc so that I can follow what's going on without having to use the
Message pane.  It also preserves that data in the rendered image, which might be
more useful than writing to a file, though you could certainly do both.

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