// Simple rig for rotating around 3 axes

var m = new THREE.Matrix4();

var m1 = new THREE.Matrix4();
var m2 = new THREE.Matrix4();
var m3 = new THREE.Matrix4();

var alpha = 0;
var beta = Math.PI;
var gamma = Math.PI/2;

m1.makeRotationX( alpha );
m2.makeRotationY( beta );
m3.makeRotationZ( gamma );

m.multiplyMatrices( m1, m2 );
m.multiply( m3 );