Slowing down objects in box2d with no gravity

box2d game-physics
Alex picture Alex · Jan 20, 2012 · Viewed 11.4k times · Source

I am making a billiards game, so my gravity is set to zero and I apply impulse to make a cue ball move. Because there is no gravity, I use both, linear and angular damping to slow the balls down.

While the balls have some decent velocity, they slow down realistically. The problem start’s when they slowdown a lot and are about to stop but don’t actually stop for like 4-5 seconds, and that’s look’s very unrealistic.

One of the solutions that I thought was to check every frame the velocity of the ball and if it’s bellow some number (i.e. when the ball is about to stop), make it zero to stop the object. The problem with this approach is that I am making a multiplayer game, where two players can have a slightly different frame rate and thus making two simulations of the same shot inconsistent.

Can anyone think of any other solution?

Answer

Andrew picture Andrew · Jan 20, 2012

Try to use linear damping parameter of b2Body:

body->SetLinearDamping(0.1f);

Related questions

how to use the libgdx contactlistener

I've just began to work with the Libgdx's Box2d Engine but i simply do not understand when the methods of the Contactlistener should be called. There is on the one hand "begin contact" and on the other "end contact". …

Read More
Android, libgdx and box2d basics

I wrote couple of simple board games since i started on android learning, Please let me know is there any tutorial or links, where i can start with physics library with libgdx, looking for something like basics of physics with …

Read More
Prevent body from rotating in Box2D

I am currently using Box2d, more precisely the Java port jBox2d. I have a circle that is colliding with other circles when falling (all those circles form a kind of a crank, see picture below). Naturely, the circle …

Read More