WinterCodeForEverything

Results 4 issues of WinterCodeForEverything

I experiment Texture a lot using OpenMVS, the result is pretty good except a small problem,when the mesh is dense and doesn't have enough images( or views ), there are...

![image](https://user-images.githubusercontent.com/28380063/60632890-a381df00-9e3a-11e9-9428-4cb41534a7d5.png) 为啥总遇到这个问题啊?

when I draw a polygon and move it , cesium will show the error: ![image](https://user-images.githubusercontent.com/28380063/50391784-a01ee400-0783-11e9-839b-ab53e4e10739.png) how to solve it?

### Prerequisite - [X] I have searched [Issues](https://github.com/open-mmlab/mmdetection3d/issues) and [Discussions](https://github.com/open-mmlab/mmdetection3d/discussions) but cannot get the expected help. - [X] I have read the [FAQ documentation](https://mmdetection3d.readthedocs.io/en/latest/notes/faq.html) but cannot get the expected help....