One: When reproducing orb-slam2, I found that there is no official version as low as Pangolin-0.5, and the higher version reported an error. I found a version 0.5 and put it in the network disk.
Link: https://pan.baidu.com/s/1HkSKetRSzyFjDd0lBpzkUg Extraction code: ee7v After copying this content, open the Baidu Netdisk mobile app, the operation is more convenient
Two: However, this version will fail to compile in ubuntu20.04 (you can try to compile first if the ubuntu version is low), the solution is:
Once this library is solved, it can be reproduced smoothly, which is relatively simple