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Editorial Team
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Asked: 2026-06-08T16:08:51+00:00

I have several balls in a world that collide with each other. There are

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I have several balls in a world that collide with each other. There are static walls on all sides of the world.

Sometimes, they end up in a position where they keep on moving up/down or left/right along the same path (motion perpendicular to the wall?)

Is there any easy way to detect this, and then, apply a little rotation to it on either direction?

Pseudocode or code in any language that has box2d would be appreciated.

Edit: Image, as requested by @Andrew

enter image description here

If the ball keeps moving like this (left/right/left/right…), I want to give it a little push so it moves from the current path.

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1 Answer

  1. Editorial Team

    I think you can create your b2ContactListener subclass to detect ball-wall collisions (It is simple and explained in Box2D manual). After you made it store 3 velocity values for each of your balls.

    1. Before first ball-wall collision.
    2. After first ball-wall collision.
    3. After second ball-wall collision.

    When you obtained these three velocities (use GetLinearVelocity function of b2Body) – check if they lie on the same line with some precision (have the same direction except the sign). If this condition is satisfied – apply a little rotation

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