Definition of roomId, roomType, objectId, and objectType in SUNCG

[playerkk]

What can I find their definitions? I didn't find much information on SUNCG's website. Thanks.

[angelxuanchang]

The roomId uniquely identifies the room in a scene, and the objectId uniquely identifies the object instance. In SUNCG, the roomId and objectId are both strings, of the form _ where the indicates the level of the house, and indicates the node in the level. In MINOS, they are encoded as integers.

For SUNCG, the mapping of index to roomType/objectType is as follows:
https://github.com/smartscenes/sstk/blob/master/server/static/data/suncg/roomTypes.csv
https://github.com/smartscenes/sstk/blob/master/server/static/data/suncg/objectTypes.csv

For MP3D, the mapping of index to roomType is as follows:
https://github.com/smartscenes/sstk/blob/master/server/static/data/matterport/roomTypes.csv

[playerkk]

If I understand correctly, I can get instance segmentation by combining objectId and objectType. Is it correct?

Thanks.

[angelxuanchang]

The objectId gives the instance segmentation without the semantic type. If you include the objectType, then you will get the instance semantic segmentation.

[playerkk]

Thanks a lot. Will close the issue.