<img src="http://img.jishulink.com/upload/201706/1498183392592_blob.png@!jslnk" title="blob.png" alt="blob.png

这个简单，先将面的过渡区进行切分，然后根据尺寸往两边拉伸，最后删除2D网格和多余的实体网格<img src="http://img.jishulink.com/upload/201706/1498198552036_009.png" title="009.png" style="max-width:760px;" alt="009.png"/>