cocos2d for iPhone

A fast, easy to use, free, and community supported 2D game engine

1. 

   sunflower
   Member

   Hi,

   I am trying to develop one game which has collision.I am new to physics engine so i was thinking that if you guys can help me to get it going. Problem that i have is i have two object which collide but i want them behave differently if they collide on certain portion.

   Like in basketball game if ball hits the ring than in bounce back and if doens't than it straight goes in the net and gets points. How we can achieve that using physic engine.
   Is there any simple way to do it or have to calculate pixel by pixel?

   I would really appreciate if you can help on this.

   Thanks
   Sunflower

   Posted 1 year ago #
2. 

   sunflower
   Member

   Guys, please help me.

   Posted 1 year ago #
3. 

   zenkimoto
   Member

   @sunflower

   You probably need to give it some time for people to respond :) But what you probably need to do is create different shapes in the physics engine and assign them a different collision_type value. You could have a shape for the backboard and a shape for the net. If the ball shape collision type hits the backboard, it bounces (in the collision function, return 1 or create a custom function). If the ball shape collision types hits the net, fall through (in the collision function, return 0).

   Check out the sample code and see: http://code.google.com/p/chipmunk-physics/wiki/CallbackSystem

   Hope this helps.

   Posted 1 year ago #
4. 

   sunflower
   Member

   Thanks for your reply.

   I do know how to use collision. I have implemented basic collision and working fine. but it doesn't look perfect. By background do you mean the Hard border of basketball net?

   In my game I have basketball net which is constantly moving. So what i want to do is when ball hit the net's border it bounce back and behave accordingly the angel it hits the net. and eventually ball either go in the net or come out of it.

   So, As you are saying. I need to have two shape
   1. Net border (circle border)
   2. Net Lower part

   If that so i do i move both at same time. will it be sync?

   I hope i make my self clear.

   Thanks
   Sunflower

   Posted 1 year ago #

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