code: function ( angle ) {
              var rad = this.DEG_TO_RAD * angle,
                  cosVal = Math.cos( rad ),
                  sinVal = Math.sin( rad ),
                  mtx3d = new $B.geom.Matrix3D( 1, 0, 0, 0, 0, cosVal, -sinVal, 0, 0, sinVal, cosVal, 0 );
              return this.concat( mtx3d );
          }
docs: Matrix 객체에 X축 회전 변형을 적용
  @param	{Number}	angle	Degree
  @return	{Matrix3D}