模拟 http://globe.cid.harvard.edu/ 飞线， https://yuanzhaokang.github.io/three.js_globe_flight_line/
threejs三维地球的飞线，仿照 http://globe.cid.harvard.edu/ https://github.com/yuanzhaokang/three.js_globe_flight_line/blob/master/image.png
