public static Bounds GetViewportBounds (Camera playerCamera, Vector3 screenPosition1, Vector3 screenPosition2) {
		var v1 = playerCamera.ScreenToViewportPoint (screenPosition1);
		var v2 = playerCamera.ScreenToViewportPoint (screenPosition2);
		var min = Vector3.Min (v1, v2);
		var max = Vector3.Max (v1, v2);
		min.z = playerCamera.nearClipPlane;
		max.z = playerCamera.farClipPlane;
	}