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hi, i have two object hero and enemy. My hero is an array with 3 player. when my hero collide with the enemy i would invoke the function : "hero.explode". My snippet is below. the problem is with the function createBodyCallback, i have two problem. the function this.hero.explode works before the collision...and my hero don't touch the enemy....why ? i cant access the body2.otherfunction() because the callback is in fact this.hero.player.body.otherfunction so i have an error. could you help me for these 2 points ? thanks. character = function(){ game.physics.startSystem(Phaser.Physics.P2JS); game.world.setBounds(-1000,-1000,40000,40000) Phaser.Sprite.call(this,game,640,h+500,'rect') this.flag_mouse=false this.flag_show_button=true //cible this.cible=game.add.sprite(w2,300,'cible') this.cible.anchor.setTo(.5,.5) game.physics.p2.enable(this.cible) this.cible.body.static=true this.cible.scale.setTo(1.5,1.5) this.player={} for (var i = 0; i < 3; i++){ this.player[i]=game.add.sprite(640,1980+i*500,'rect') game.physics.p2.enable(this.player[i]) this.player[i].body.setCircle(20) } } character.prototype = Object.create(Phaser.Sprite.prototype) character.prototype.constructor = character character.prototype.explode=function(body1,body2){ body2.sprite.alpha=0 body2.otherfunction() } character.prototype.otherfunction=function(){ console.log("explode") } this.hero=new character() //far for (var i = 0; i < 3; i++){ this.enemy.body.createBodyCallback(this.hero.player[i],this.hero.explode,this) }