A fast, easy to use, free, and community supported 2D game engine
I know that cocos has chipmunk built in. Are there any good tutorials as far as collision detection and gravity goes. As in how would I make an object, which I'm assuming would be a sprite, fall from the sky and bounce off of other objects?
Some tutorials on this kind of thing would be great.
Thanks.
Steve Oldmeadow
Administrator
It is in the svn repository and should be in the .8 beta. It is using the Box2D physics engine though, from your post it sounds like you want to use Chipmunk.
Alright, so let me ask you this. And I'm sorry for asking what I know are simple questions. Like I said before, objective c gives me trouble. I have my application set up with a menuScene class, a gameScene class, and a class to create my sprites. Like most tutorials I've seen say to do. Now, when using chipmunk I'm assuming I should setup chipmunk and initialize the space etc. in the application delegate and pass it to the game layer class, which would then pass it to the sprite creation class.
Is that correct?
Or would I do it in the game layer? Since I guess when I switch to another game layer all the sprites would be removed anyway, so it may as well be another chipmunk space.
I have no experience with game programming and am pretty much looking for some best practices.
Thanks for the quick response. I got that all setup and working properly. As far as chipmunk goes, how do I get a ridiculous bounce? As in have a ball bounce around the screen. I have a gravity of -2000 so that I can have the ball falling very fast. And the ball bounces a little bit off of the floor, but I would like it to bounce up to the ceiling and then bounce off of that.
Also, how do these collision_types work? What will count as colliding with what. I have my floor as 0 and my ball as 1. And that works. What if I have 15 balls? Will they all have to have different values?
Thanks
tatebn: you have to set the elasticity of the shapes to something bigger. Try 1 or 1.5. If objective-c is giving you problems, you could always try ShinyCocos (I could use another tester :-P). Check my tutorial on chipmunk/sprites:
http://rolando.cl/shiny_cocos/mixing_physics_and_sprites
hth,
rolando./
The best you could do: test :-)
On Jun 27, 2009, at 4:58 PM, cocos2d-iphone-discuss@gamesforfood.cl
wrote:
> tatebn says:
> I saw the 1 or greater thing in the chipmunk documentation, but it
> said that setting the elasticity to 1 or greater is not recommended
> due to "due to inaccuracies in the simulation". Is that not a problem?
>
cheers,
--
Rolando Abarca M.
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