var alpha = this.deviceOrientation.alpha ? THREE.Math.degToRad( this.deviceOrientation.alpha ) + this.alphaOffsetAngle : 0; // Z
    var beta = this.deviceOrientation.beta ? THREE.Math.degToRad( this.deviceOrientation.beta ) + this.betaOffsetAngle : 0; // X'
    var gamma = this.deviceOrientation.gamma ? THREE.Math.degToRad( this.deviceOrientation.gamma ) + this.gammaOffsetAngle : 0; // Y''
    var orient = this.screenOrientation ? THREE.Math.degToRad( this.screenOrientation ) : 0; // O
    this.setObjectQuaternion( this.object.rotation, this.object.quaternion, alpha, beta, gamma, orient );
    this.alpha = alpha;

this.setObjectQuaternion = function() {

    var zee = new THREE.Vector3( 0, 0, 1 );

    var euler = new THREE.Euler();

    var q0 = new THREE.Quaternion();

    var q1 = new THREE.Quaternion( - Math.sqrt( 0.5 ), 0, 0, Math.sqrt(0.5) ); // - PI/2 around the x-axis

    return function( rotation,quaternion, alpha, beta, gamma, orient ) {

        ///////////////////////////////
        rotation.x = beta;
        rotation.y = gamma
        rotation.z = alpha;

        this.vec.copy(viewer.scene.getActiveCamera().getWorldDirection());

        viewer.scene.view.direction = this.vec;

        ////////////////////////////////

         // euler.set( beta, gamma, - alpha, 'YXZ' ); // 'ZXY' for the device, but 'YXZ' for us

         // quaternion.setFromEuler( euler ); // orient the device

         // quaternion.multiply( q1 ); // camera looks out the back of the device, not the top


         quaternion.multiply( q0.setFromAxisAngle( zee, - orient ) ); // adjust for screen orientation

        // document.getElementById('area').value = 'alpha: ' + beta.toFixed(5) + ' beta: ' + gamma.toFixed(5) + ' gamma: ' + alpha.toFixed(5) ;
        // document.getElementById('area').value = 'X : ' + beta.toFixed(5) + ' Y ' + gamma.toFixed(5) + ' Z: ' + alpha.toFixed(5) ;
        // document.getElementById('area').value = "alphaoffset:" + this.alphaOffsetAngle + " betaoffset:" + this.betaOffsetAngle + " gammaoffset:" + this.gammaOffsetAngle;


    }

}();