Phaser P2 Collision Problem

[Hoffenheimer97]

Hi all,

I'm working on a little racing game and using this map:

 

I'm using p2 physics. Whenever the car touches the gras it should become slower. In order to achieve that I cut out the inner gras and created a polygon shape for it.

/*Adding car*/
    car = game.add.sprite(1100,300,'car');
    car.name="car";
    car.width=100;
    car.height=175;
    game.physics.p2.enable(car);
    car.body.angle = 90;
    game.camera.follow(car);

 inner_gras = game.add.sprite(1320, 940, 'gras');
    game.physics.p2.enable(inner_gras);
    inner_gras.body.kinematic = true;
    inner_gras.body.clearShapes();
    inner_gras.body.loadPolygon('collision', 'inner_gras');
    inner_gras.name="inner_gras";

For the collision detection I use game.physics.p2.setPostBroadphaseCallback(): 

game.physics.p2.setPostBroadphaseCallback(hitGras, this);

function hitGras(body1,body2){
    if((body1.sprite.name === "inner_gras" && body2.sprite.name === "car") ||(body1.sprite.name === "car" && body2.sprite.name === "inner_gras")){
        console.log(body1);//console.log(body2.sprite);
        return true;
    }
    else{
        return false;
    }

}

The collision detection works fine, but whenever I try to do something else than returning true, for example changing the speed or something else, a contact between the car and the inner_gras sprite is detected, where they shouldn't have any contact.

It seems like the inner_gras sprite does still have the rectangular shape, although applying clearShapes().

 

Any ideas or suggestions on how to solve this problem, or what to use instead?

 

Thanks in advance!

[samid737]

You can try to inspect your physics bodies to see what is going on by enabling debug:

https://phaser.io/examples/v2/p2-physics/body-debug

[Hoffenheimer97]

I fixed this issue:

 

setPostBroadphaseCallback seems to be the wrong method for what I'm trying to do.

 

Instead I'm now working with onBeginContact() and onEndContact().