Time until collision

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Posts: 1
Joined: Wed Feb 15, 2012 11:22 am

Time until collision

Postby SPQR3 » Fri Feb 17, 2012 8:21 am

I have only one circle, and one square. They are both dynamic bodies, affected by gravity. I would like to calculate how much time there is until they collide. Actually I would like to call a function when there is exactly 1 sec before the collision. Do you know a way to achieve this with Box2D without making the calculations myself? I have seen something similar called "Time of Impact", but haven't found any examples online for it.

Erin Catto
Site Admin
Posts: 2948
Joined: Thu Sep 06, 2007 12:34 am

Re: Time until collision

Postby Erin Catto » Fri Feb 24, 2012 4:27 pm

Yeah, you can use b2TimeOfImpact. You'll have to look at some of the examples in the testbed because it is an internal function and it is not documented in the manual.

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