And actually, there seems to be some potentially conflicting information in the
documentation.

https://wiki.povray.org/content/Documentation:Tutorial_Section_2.2
"For every position in POV-space, a pattern returns a float value in the range
from zero to one. Values outside the zero to one range are ignored."

Presumably if a pigment pattern was wrapped in a function, one could then have
access to the actual values emitted, and either graph them or just run tests to
detect the presence of values <0 or >1.

- BE

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