3d Compatability

Hi guys, I have a quick question concerning 3d compatibility and coco2d-X. A lot of Chinese games
are leveraging cocos2d-X and a few of them appear to be using 3D graphics. For example, take a look at Fishing Joy 2. Is this game actually using 3D rendering assets or are they using 2d sprites to create the vibrancy we see in the app? If 3D assets are being used, is this capability inherent with cocos2d-x or an additional add on functionality built into the development pipeline? Just want to ensure our artist are developing the best asset types for our project. Thanks.

They use 2D sprites