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is there any example that shows a asteroid like game with unlimited enemy/asteroids spawning?
How can I do this with cocos2d and box2d?
PS: They should come from all directions…
Your question is so general that you seem like just crawling into the dark.
What you want is to set a maximum amount of enemies and then randomly (possibly biased by the difference between maximum enemies and current enemies, so that if there are less enemies the chance to spawn a new one is higher) you spawn them.
You can do it in
-(void)update:(ccTime)dtmethod which is automatically called by cocos2d life cycle on every repaint of the whole display. You can enable this automatic scheduling by calling[self scheduleUpdate]in the init method of yourCCLayersubclass.