Type Alias OrbitTouchAction

OrbitTouchAction: "rotate" | "pan" | "zoom-pan" | "zoom-rotate" | "none"

What a touch gesture does; assign one to each slot of OrbitCamera#touches

The two-finger combos pinch to zoom while dragging the midpoint pans or rotates.

const twoFingers: OrbitTouchAction = mapMode ? 'zoom-pan' : 'zoom-rotate';

orbit.touches.two = twoFingers;