> Just put the function in as a pattern, no syntax changes are needed.

That leaves me with one problem. The functionvalues are taken modulo 1, but
with several interfering waves I might get 'overexposures' on my
'photographic plate' which I don't want to warp back in intensity, but keep
white.
if(pattern>1) pattern=1
if(pattern<0) pattern=0
Would it be hard to implement a keyword like 'no_modulo' for the pigments?

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