JS____THREEjs GEOMETRY _____ RotateMeshByLine

    function rotateByLine ( mesh, from, to ){
        var
                up          = new THREE.Vector3(0, 1, 0),
                tangent = new THREE.Vector3().subVectors(from, to).normalize().negate(),
                radians = Math.acos(up.dot(tangent)),
            axis        = new THREE.Vector3().crossVectors(up, tangent).normalize();

        mesh.position.copy( from.lerp( to, 0.5 ) );
        mesh.quaternion.setFromAxisAngle( axis, radians );
    }