Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!celia!neil
From: neil@celia.UUCP (Neil Richmond)
Newsgroups: comp.sys.amiga.graphics
Subject: Re: Imagine
Message-ID: <970@celia.UUCP>
Date: 2 Apr 91 16:43:05 GMT
References: <5312@mindlink.UUCP>
Reply-To: celia!neil@usc.edu (Neil Richmond)
Organization: Rhythm & Hues, Inc., Hollywood
Lines: 38

In article <5312@mindlink.UUCP> Scott_Busse@mindlink.UUCP (Scott Busse) writes:
>Neil, Imagine does have both keyframe animation, and spline paths. Acceleration
>and deceleration are not linked to the spline function of paths though, but
>rather to an option in the Action editor.(Note the accel/decel is only
>available as of version 1.1) As for the morphing being used for such things as

I will check out whether there are splined paths. If there are, then the tools
already exist to do accelerations and decelerations. It is a matter of placing 
your keyframes in the correct place and time. Simple example to make an
acceleration using 3 keyframes and 30 frames:

Keyframe 1, frame 1: Pick first position of object to spline.ie x = 0
Keyframe 2, frame 2: Make this frame identical to frame 1. ie x = 0
Keyframe 3, frame 30: Make a new position for object. ie x = 10

Spline this sequence of keyframes. If you plotted this it would show an
accelerating curve. Roughly, like this:

10              * 
                *
               *
              *
             *
           **
         **
      ***
0 ****
  1...10...20...30

The higher the tension on the curve, the slower the ease in to the move and 
the faster the acceleration. A deceleration would be the reverse of this.

neil

-- 
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Neil F. Richmond         INTERNET: celia!neil@usc.edu
Rhythm & Hues Inc.       UUCP: ...{ames,hplabs}!lll-tis!celia!neil)