photoscan无人机使用手册：https://wenku.baidu.com/view/3c0f810508a1284ac950439f.html
https://wenku.baidu.com/view/22bb61c0d05abe23482fb4daa58da0116c171f05.html
http://www.docin.com/p-1836864920.html
Meshlab导入obj文件：
https://blog.csdn.net/paohui0134/article/details/53456275
obj格式、mtl格式：
https://blog.csdn.net/zsq306650083/article/details/49869129
用meshlab三角面化点云：
https://blog.csdn.net/hw140701/article/details/78876507
https://blog.csdn.net/HW140701/article/details/72778116