Existing 3D datasets that we can use for 3D CNN:

1. RGB-D devices: Google Tango, Microsoft Kinect, etc.(https://developer.microsoft.com/en-us/windows/kinect)
2. Lidar(https://en.wikipedia.org/wiki/Lidar)
3. 3D reconstruction from multiple images (https://en.wikipedia.org/wiki/3D_reconstruction_from_multiple_images)