1. ## collision detection

Hello,

I'm searching for some algorithms to modell some physiks and for collision detection in a 2d game. For example how to modell that a ball is hit by a paddle, has anybody some expiriences or can tell me a good link to find out something more???

thanks

Jan

2. You can try simple rectangle intersection test, or a reduced rectangle intersection test. Google is your best friend.

3. thanks lukemaung,

but I still have a problem, with a rectangle interception test (as far as I understood) I can only test for example if a moving ball hit a resting paddle. But I want to calculate the interception between a moving paddle and a moving ball.

For example:

xb = vx * t
yb = vy * t

xp = x0 + r * cos(wp * t)
yp = y0 + r * sin(wp * t)

wp is the constant angular velocity

I thougt of something like:

(vx * t - x0)/(vy * t - y0) - 1/tan(wp * t) = 0

->

f(t) = tan(wp * t) - (vy * t - y0) / (vx * t -Y0) = 0

But I don&acute;t think that I can solve such a equation in realtime on a mobile phone...(I think I would have to use something lika a gausian approach proceeding...).

any idea???

thanks

Jan

4. try "Physics for Game Programmer" by O'RIELLY it might offer some help, it has point in polygon tests and other collision detection stuff.

5. from my point of view, one of best and easiest resource about 2D and 3D collision and physics is next
http://www.d6.com/users/checker/dynamics.htm#samples

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