Hello all,
I want to create an application where balls keep moving on iPhone screen and they when they collide they gets a rebounding action. Every minute I want to add 1 balll upto a limit.
Is there any easy way to do it or anyone have done this kind of application.
Kind of an open-ended question but here is a tutorial on creating "pong" which should get you started thinking about the physics behind the motion.
I coded something like this up as an exercise a few months back. I was using around 120 facets on each sphere and very standard completely elastic 'billiard ball' collision physics - implemented directly in OpenGL using Phong shading.
I don't pretend the application was optimised but there wasn't any utter howlers in it, and on a standard iPhone (3G, not the latest 3GS ones) I was able to handle about a dozen balls before the frame-rate slowed to unusable.
Split up your app into lots of smaller problems. Start by displaying one square, then make it a sphere, then try displaying many of them, and then adding some movement, and then the physics calculations. There are probably lots of tutorials on each of those smaller steps.