Jianling Zhou

In [polygonmesh.cpp](https://github.com/yifita/3PU/blob/master/prepare_data/virtual_scanner/polygonmesh.cpp) line 154, there is an obvious bug: ```c++ if (argc > 3) // should be 'argc > 5' { start_id = atoi(argv[3]); end_id = atoi(argv[4]); model_id = atoi(argv[5]);...