A Few Questions About the Code

[Yaozh66]

Hello, we are confused about some questions when reading you code:

1. What are the differences or relationships among the variables in your code: "obj_id", "obj_track_id", "obj_local_id“ and ”lock_obj_track_id“ ?
2. I think the ObjectIdManager in obj_id_list.js should be modified when deleting or altering the id and category of a bbox. Besides, we are using dev-auto-annotation branch. Can you give us some advice? Thank you.

[naurril]

1. obj_id == obj_track_id, user can modify it or leave it empty obj_local_id is used internally and can't be changed by user. lock_obj_track_id is used to select the same object when navigating to prev/next frame.

2. deleting a used obj-id is tricky. you need to make sure the id is really deleted in all frames of the scene. think about it when a scene contains many frames and only a part of them is loaded.

[Yaozh66]

Get it! And one more question, what's the use of the red little circle in the center right bottom of this side-view of z-axis?

[naurril]

The red circle indicates the direction of original point (0,0,0) (or ego car), maybe a cross is better.

[Yaozh66]

Thanks very much! You solved my question!