In article <3a3f7c6f@news.povray.org>, Geoff Wedig 
<wed### [at] darwinepbicwruedu> wrote:

> What you wrote works, but if you have:
> 
> #declare test_function = function { Func }
> 
> eval_pattern(test_function, Pt)

That won't work because you are just passing the function identifier. 
The eval_pattern() function takes a *pattern*. Use this instead:
eval_pattern(function {test_function(x, y, z)}, Pt)
The "function {}" is necessary, because that is what tells POV it is a 
function pattern.


Oh, and a partial workaround for the range problem:
#macro Eval_Func(Func, MaxRange, X, Y, Z)
    eval_pattern(function {Func(x, y, z)/MaxRange}, < X, Y, Z>)*MaxRange
#end

A slightly more complex macro could be written to handle any range, you 
just need to tell it what range your function will be using.

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

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