Box2D ApplyForce/Impulse?

Monkey Forums/Monkey Programming/Box2D ApplyForce/Impulse?

CopperCircle (Posted 2012) [#1]

Hi, I have been playing with box2d and can't get ApplyForce/Impulse to do anyting, i am using like this: playerEntity.body.ApplyImpulse(New b2Vec2(0, -50), playerEntity.body.GetPosition()) But nothing happens, SetLinearVelocity works but Force/Impulse do nothing...? Thanks.

muddy_shoes (Posted 2012) [#2]

ApplyImpulse definitely works because I'm using it. Could be an issue with the impulse scale compared to the mass of your object.

CopperCircle (Posted 2012) [#3]

Thanks, I had not set the Mass Data at all, after adding this, Force/Impulse works :) Local massdata:b2MassData = New b2MassData() massdata.center = New b2Vec2(0,0) massdata.mass = 1.0 massdata.I = 0.0 playerEntity.body.SetMassData(massdata) One more question, how do you get a sphere to bounce with the same velocity of its impact? I have set the restitution to 1.0 and there is a small bounce but I was aiming to get it to keep bouncing continuously..?

muddy_shoes (Posted 2012) [#4]

You've set the restitution of the thing your entity is hitting to 1.0 or the entity? I set my static bouncy platforms to have a restitution of 1.0 and the player avatar to 0.3.

CopperCircle (Posted 2012) [#5]

Thanks, I had both set to 1, reducing the player to 0.3 helps.