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Chipmunk Physics • View topic - Gravity Along Z

Gravity Along Z

Official forum for the .

Gravity Along Z

Postby inveni0 » Fri Dec 09, 2011 6:54 pm

I'm planning to implement Chipmunk in iOS, but before I do, I need to know if I can apply gravity to the z-axis. Imagine something like a top-down game where balls roll around or something. Gravity should be pulling through the back of the device, and not from any of the sides.

Is this possible?

SOLVED:
Last edited by inveni0 on Sat Dec 10, 2011 8:58 am, edited 1 time in total.
inveni0
 
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Re: Gravity Along Z

Postby gnasen » Fri Dec 09, 2011 7:18 pm

If I understand you right, you want to do something like this?
http://www.mepix.info/varomex/hlo/1512.jpg
A gravity which is goes "through" your plain and nails a marble on the ground?

As far as I know there is no build in function in chipmunk for it (cause its a 2d physic engine ;) ), however you can implement this (fake) gravity by yourself.
In this case (if you assume that the marble always touches the ground and cant "fly") its not very difficult.
For example the board is parallel to the ground, no additional force will take effect on the marble. But if you change the board for example around the Y axis, the marble will roll along the X axis.
So all you have to do is to project the gravity Z axis on the X/Y plane and add the force to the marble. The math behind it is not that difficult (sine / cosine etc).
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Re: Gravity Along Z

Postby inveni0 » Fri Dec 09, 2011 10:02 pm

Yes. Your example isn't what I'm programming, but it uses the same physical rules. Another example would be UIViews acting like papers on the surface of a table.

I know I can program some basic acceleration and deceleration, but I was hoping to use Chipmunk to handle the collisions between a number of different "papers" or "marbles".
inveni0
 
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Re: Gravity Along Z

Postby gnasen » Sat Dec 10, 2011 3:51 am

Im not sure what you exactly want, but collisions can act on different layers (see manual "Chipmunk Collision Shapes: cpShape") to simulate some layers above each other or something like that.
Is maybe that what you want?
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Re: Gravity Along Z

Postby inveni0 » Sat Dec 10, 2011 8:24 am

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