lights = {
let group = new THREE.Group();
let hlight = new THREE.HemisphereLight(0xffffff, 0x888888);
let dlight = new THREE.DirectionalLight( 0xffffff, 0.56 );
dlight.position.set( 3, 3, 3 ).normalize();
let dlight2 = new THREE.DirectionalLight( 0xffffff, 0.56 )
dlight2.position.set( -2, -2, -2 ).normalize();
group.add( hlight, dlight, dlight2 );
return group;
}