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From: ewa@sdcc3.UUCP (Eric Anderson)
Newsgroups: net.micro.amiga
Subject: Re: Amiga reactions
Message-ID: <2996@sdcc3.UUCP>
Date: Sat, 14-Sep-85 01:14:28 EDT
Article-I.D.: sdcc3.2996
Posted: Sat Sep 14 01:14:28 1985
Date-Received: Wed, 18-Sep-85 05:33:26 EDT
References: <3568@topaz.RUTGERS.EDU> <368@ssc-bee.UUCP> <918@loral.UUCP>
Reply-To: ewa@sdcc3.UUCP (Eric Anderson)
Distribution: net
Organization: U.C. San Diego, Academic Computer Center
Lines: 21
Summary: bouncing balls are easier than you think

In article <918@loral.UUCP> jlh@loral.UUCP (Belly Up) writes:
>> 
>>  I saw the famous "bounce" program and was blown away.  For those who haven't
>> seen it, this is an animation of a beach ball bouncing in a room.  The beach
>> ball is red and white patchwork, and rotates on its axis as it moves.  It
>> has a shadow which follows it across the floor and the background. 
>I saw this running on a monitor at SIGGRAPH and the demo was pretty impressive.
>However, one should realize that for the show a lot of manufacturers spent
>several minutes drawing a picture, then saved the picture to disk or videotape.
>Do this several times and you have an animated feature.  You'll never guess
>what they showed during the demo.  Thats right, they showed the canned
>pictures.  If the amiga was drawing this beachball as it went then this is
>one helluvan impressive system, but I wouldn't count on it.  Especially
>if that 8% number is correct......

Actually such a program is no big deal. several small images of a beach-ball in
various stages of rotation are saved in memory and then copied onto the screen
with a block move. when used in order, the ball appears to be rotating. No big
deal, and very little processor work.

E. Anderson, UC San Diego {elsewhere}!ihnp4!ucbvax!sdcsvax!sdcc3!ewa