Class: ArcballControls

Arcball controls allow the camera to be controlled by a virtual trackball with full touch support and advanced navigation functionality. Cursor/finger positions and movements are mapped over a virtual trackball surface represented by a gizmo and mapped in intuitive and consistent camera movements. Dragging cursor/fingers will cause camera to orbit around the center of the trackball in a conservative way (returning to the starting point will make the camera to return to its starting orientation).