In article <3ae8369d$1@news.povray.org>, "Dennis Milller" 
<dhm### [at] mediaonenet> wrote:

> I came across this code and have on question. If the xcounter and zcounter
> are identical, why can't they be interchanged in the translate statement?
> The image changes dramtically if I substite "zcounter" for "xcounter" or
> vice versa, yet the "declare statements seem to do exactly the same thing.

Because they are *not* identical. Indenting the code properly makes it 
clearer:

#declare xcounter = 0;
#while (xcounter < 50)
    #declare zcounter = 0;
    #while (zcounter < 50)
        ...
        #declare zcounter = zcounter + 1;
    #end

    #declare xcounter = xcounter + 1;
#end

The zcounter loop is completely independant of the xcounter loop, and 
loops from 0 to 49 *every time the xcounter loop goes through one loop*. 
The outer loop runs through 50 times, and for each loop the inner loop 
gets reset and runs through again.
This has the effect of zcounter going from 0 to 49 while xcounter = 0, 
then again while xcounter = 1, and so on. They start out and end at the 
same values, but change at different times and rates.

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

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