The Ugly wrote:

> #macro MyFunc(Length,Formula)
> 
> <SNIP>
> 
> But as you might see this is of little use.
> If this is to become usefull you have to be able to use it like this:
> 
> MyFunc(N*N)
> 
> In other words, you will have to be able to refere to the local N
> when you call it, but it hasnt been defined yet. If you try to define
> it before you call the macro it will calculate the value before passing
> it into the macro.
>
> Do I make any sense?

No, you do not. Your MyFunc macro takes two parameters. What is 'N*N' in 
MyFunc(N*N)? Are you trying to pass this as a 'Length' or a 'Formula'?

Looks like your 'Formula' just returns a 'y' value, so this might get 
you started:

#macro MyFunc(Length,Formula)
   #local N=0;
   #while (N<=Length)
     sphere { 0, 0.02
       pigment { rgb <N,0,N*-1+1> }
       translate <N,Formula(N),0> // this line is changed
     }
     #local N=N+0.1;
   #end
#end

MyFunc ( 10, function(x){x*x} )

// or try
// union{ MyFunc( 10, function(x){sin(x)} ) translate <-5,-3,0>}
// union{ MyFunc( 10, function(x){cos(x)} ) translate <-5,0,0>}
// union{ MyFunc( 10, function(x){sin(cos(x))} ) translate <-5,3,0>}

camera {
	location <0,0,-10>
	look_at 0
}

  -Shay

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