How to use P2 Physics with each layer object?
Code
this.saws = this.game.add.group();
this.saws.enableBody = true;
this.map.createFromObjects('saws', 4, 'saw', 0, true, false, this.saws);
this.saws.forEach(function(saw) {
saw.body.clearShapes();
saw.body.loadPolygon('physicsData', 'saw');
});