[gameprogrammer] Re: advanced game

Do you have seen Sonic Adventure Games???
Do you have seen how he change his body rotation when is running over a spiral????. Something like this image. 
Do you have any idea how make something like that????
<fancy.bmp>
The only thing that occurs to me would be to have a definition of a curve somewhere, calculate how far the avatar would run that frame, then calculate distance along a curve, and finally find the normal at that point. How to do this is beyond my recollection from math classes, however, and there's GOT to be a better way... Oh! I bet if you knew that the arc was part of a perfect circle you could handle that pretty easily (relatively speaking). Again, I don't remember the maths, but I recall it's not too hard to find things like rotation/distance along the circumference of a circle, and once you know the angle, well, there's your angle! ^_^
It's still likely a lot of trigonometry, and I have to believe there's a better way to work it out... Let me think before I send this.
Well, it doesn't deal with exactly what you're saying, but here's an amazing 2D collision tutorial I've found and plan on using extensively in the near future(-ish) and I think that from the round collision section you may be able to pull out some useful information for what you want: 

http://www.harveycartel.org/metanet/tutorials/tutorialA.html

--  Scott

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