var rotation = Quat.safeEulerAngles(Camera.getOrientation());
rotation = Quat.fromPitchYawRollDegrees(0, rotation.y, 0);
var center = Vec3.sum(MyAvatar.position, Vec3.multiply(6, Quat.getFront(rotation)));

var proceduralJSON = {
    "ProceduralEntity": {
        "version":2,
        "shaderUrl":"file:///Users/sam/Desktop/hack/hack0.fs",
        "uniforms":{
            "iChannel0":"http://demos.vicomtech.org/volren/aorta-high.jpg",
            "iSize": [1.0, 2.0, 4.0]}
    }
}


var theUserData = JSON.stringify(proceduralJSON);

var volumeEntity = Entities.addEntity({
    name: 'VolumeEntity',
    dimensions: {
        x: 10,
        y: 10,
        z: 10
    },
    type: 'Box',
    position: center,
    color: {
        red: 255,
        green: 255,
        blue: 255
    },
    visible: true,
    collisionless: true,
    userData: theUserData
});