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  2D football game but the ball simulate 3D by changing sprite representation  (Read 1713 times)
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Offline Oss117

Junior Newbie





« Posted 2007-11-22 18:56:46 »

Here we go, first my little jar to illustrates what i am doing
http://www.yourfilehost.com/media.php?cat=other&file=3242kotrials.jar

I am using Golden T Game Engine (GTGE) library to develop my application

Then a little video about what I expect to reproduce http://youtube.com/watch?v=vksEQrgjbZI

Then little history about Kick Off http://en.wikipedia.org/wiki/Kick_Off

And at least my question, related to the ball physics, as you see it's a 2D game, but the ball simulate 3D by changing sprite representation when it's height position changing
and you take a look in the jar file, in the res/sprites directory you have the ball.png sprites file. First five sprites are for normal bouncing but latest four one are when the ball is growing in the air, with the last one, that is only the ball's shadow, which has to be placed somewhere on the pitch.

Some parameters I can provide
[php]   /** acceleration constant (m/s^2) */
   public static final double   G = 9.81;
   /** ball mass (kg)<br>
    * <a href="http://www.fifa.com/">FIFA.com</a> says: <em>not more than 450 g in weight and not less than 410 g</em>

    */
   public static final double   M = 0.430;
   /** air resistance term */
   public static final double   K = 0.350;
   /** bounce angle factor (must be less that 1) */
   public static final double   BOUNCE_SPEED_FACTOR = 0.8;
   /** In order to save calculation time, M/K is precalculated */
   //private static final double   M_K = M/K;
   /** In order to save calculation time, K/M is precalculated */
   private static final double   K_M = K/M;
   /** In order to save calculation time, MG/K is precalculated */
        //private static final double   MG_K = M*G/K;   [/php]

What would be the best way to handle that problem.

Just to figure out what is a sprite in the GTGE library, take a look here http://goldenstudios.or.id/products/GTGE/docs/com/golden/gamedev/object/Sprite.html

Thanx for your help
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