Drag direction in 3D depends on user background and kind of application. It depends on if you expect to be moving the world or a virtual character. In the case

Drag direction in 3D depends on user background and kind of application. It depends on if you expect to be moving the world or a virtual character. In the case of a panorama viewer I understand that some people might expect to move the picture (the world) as you do on a phone photo gallery or map application. For a first person interactive application it's more likely to expect that the character will turn to the direction you are dragging the mouse. You're controlling the character and not the world.