GRAPH 3D v2.425 (20-FEB-2017)

[Han]

The way rotation works is based on the viewing angles. There isn't much code in terms of trying to guess where you are grabbing. Instead, grab the top-most or bottom-most corners to rotate and it will generally guess right. It also bases the motion on whether or not the back area is visible.

For panning, just keep your two fingers the same distance apart as you move them both up and down or left and right.