Re: Challenge!

 BBS: Inland Empire Archive
Date: 11-27-92 (16:28)             Number: 360
From: RICH GELDREICH               Refer#: NONE
  To: BRETT LEVIN                   Recvd: NO  
Subj: Re: Challenge!                 Conf: (2) Quik_Bas

>      Yes, that's what I was talking about.  Use a routine like that,
> and the spheres would be realistically shaded too, instead of just the
> basic orb type of thing.  How is a square root done in asm?  Thanks!

    I found a great algorithm in my encyclopedia, and used it in that
3-D sphere program I sent you(you did see that, didn't you? I sent the
source along with it).

    Let me see... It works *something* like this. Let's say we wanted to
find the square root of, 100.

    First pick an approximate answer, say 5, and set Answer equal to
this number:

    Answer = 5

    Then, in a loop, find the average of the number you want the square
root of divided by your current answer, and your answer:

    FOR A=1 to iterations
         Answer=(100/Answer+Answer)/2
    NEXT
    Answer=square root

    The number of iterations, and how close your estimate is, determines
how close your final answer is. Simple!

    I'm pretty sure that's what I used(my memory isn't that great).

    Rich
>
> Brett
>
> PS- Do I get the $20 microdollars?  :-)

    Would a check be okay? :-) Sure you do!


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