3d game and physics engines

[kb5]

what is the most popular 3d game frameworks and physics engine for ios games?
i just want to develop a simple 3d game with 3d primitives and i don't know where to start ? i heard about Bullet physics and cocos3d,is there anything and with documentation or books

[Heli Apps]

Try Unity3d
UNITY: Game Development Tool

[Raffaello]

I've used Newton (Newton Game Dynamics • About Newton) in my Splash Ball game, I found it very easy to use

[kb5]

thanks for answers, what you can say about performance of this engines? newton is just physics engine right?if it's not a secret can you tell me how is Splash Ball fps on 3GS?
and who uses a Bullet Physics?, now i'm experimenting with it, and wants to know is that right to use Bullet for not so complex and hard game or no?

[Raffaello]

Yes, Newton is just a physics engine, you need to combine it with a graphics engine (maybe Cocos3d?). I've looked at Bullet before, I guess they're quite similar in features, I just found Newton more easy to learn.
Splash Ball runs at probably 15 to 20fps on a 3G, however mainly because of the graphic engine (the real time shadows are the problem, I'll probably disable them on the next update), from what I've seen on the profiler the physics engine does not cause much overhead (of course, it will depend of how many physic objects you'll have in your scene).