On 11/8/23 16:44, Bald Eagle wrote:
> #declare Onion = function {pigment {onion} color_map {[0 rgb 0] [1 rgb 1]}}

FWIW. A better option, when all you want is a pattern's scalar value for 
a function is:

#declare Onion = function {pattern {onion}}

It avoids the conversion to grey - and, of course, no worries about the 
default color map.

---
Aside: I saw your other posts on select() and yuqk/v4 ideas, but it'll 
be a bit before I can even read through them. I'm still working through 
tuple / batch assignment issues. Once I manage that bit, 
'local'/'global' pseudo dictionary and 'optional' issues will pop off 
the debug stack.

Busy with real life later today too.

Bill P.

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