In article <3876546f@news.povray.org>, <msk### [at] msncom> wrote:

> Another method... if you can deal with a slight increase in parse time.  
> Take the code you have and copy it so it appears twice in a
> row.  Then take the first occurance and change it like this (I commented 
> the "ADDED" lines to show which ones they were):
> 
> #declare STEP=0.2;
> 
> #declare NumLights = 0;  // ADDED
> 
> #declare M=-1;
> #while (M<=1)
>     #declare N=-1;
>     #while (N<=1)
>         #declare O=-1;
>         #while (O<=1)
>             #declare NumLights  = NumLights + 1; // ADDED
>             #declare O=O+STEP;
>         #end
>     #declare N=N+STEP;
>     #end
> #declare M=M+STEP;
> #end
> 
> Then you can divide by NumLights.  Just make sure STEP is the same in 
> both sets of loops.

That won't work, you have to increment NumLights only for those 
positions inside the sphere:

#declare M=-1;
#while (M<=1)
    #declare N=-1;
    #while (N<=1)
        #declare O=-1;
        #while (O<=1)
            #if (vlength(<M,N,O>) <= 1 )
                #declare NumLights  = NumLights + 1;
            #end
            #declare O=O+STEP;
        #end
        #declare N=N+STEP;
    #end
    #declare M=M+STEP;
#end

Then you can use NumLights as the divider in the loop that places the 
lights.

-- 
Chris Huff
e-mail: chr### [at] yahoocom
Web page: http://chrishuff.dhs.org/

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