Offset Body

var config = {
    type: Phaser.AUTO,
    width: 800,
    height: 600,
    backgroundColor: '#1b1464',
    parent: 'phaser-example',
    physics: {
        default: 'matter',
        matter: {
            gravity: { y: 0.6 },
            debug: true
        }
    },
    scene: {
        preload: preload,
        create: create
    }
};

var game = new Phaser.Game(config);

function preload ()
{
        this.load.setBaseURL('https://cdn.phaserfiles.com/v355');
    this.load.image('triangle', 'assets/sprites/triangle.png');
    this.load.image('platform', 'assets/sprites/platform.png');
}

function create ()
{
    var shapes = {
        "triangle": [
            [ {"x":99,"y":79}, {"x":77,"y":118}, {"x":124,"y":118} ]
        ]
    };

    var triangle = this.matter.add.sprite(400, 100, 'triangle', null, {
        shape: { type: 'fromVerts', verts: shapes.triangle },
        render: { sprite: { xOffset: 0.30, yOffset: 0.15 } }
    });

    triangle.setAngle(16);
    triangle.setBounce(0.9);

    this.matter.add.image(400, 550, 'platform', null, { isStatic: true });
}