Using rajawali library.
I am using a sphere to show a 360 photo, with sphere's scaleX set to -1 and camera's position to Vector3.ZERO, I am able to see the 360 photo from the inside. With ArcballCamera to replace the default camera, I can use touch gesture to see all the 360 degrees.
The problem is that after touching and moving, the scene will be upside down. How to prevent this? How to enable the gimbal lock feature in rajawali.