
move along a track? 
See example in text for a start. 
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See example in text for a start. 
02112007, 05:49 PM
This will take a little work, but is definitely possible.
For a start, I suggest you look at problem 4 in Chapter 6 of the textbook by Dunn, et all. This outlines the basic approach, which is to have the object move from point to point along a mathematically defined curve. This works well for some motions  swimming with sine waves per the example, ringing effects with sine waves that also decrease with time, parabolic curves for missle or cannon shells, etc. For arbitrary curves, you will need to do curve fitting of some type  for a start, see the links at http://en.wikipedia.org/wiki/Curve_fitting. These generally do point by point fits  however this is still quite helpful, since it doesn't take a lot of points to define a fairly complex path. You just have to experiment a bit. It would be nice however to be able to simply fit to a drawn curve  anyone have any links for that? 


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