# HG changeset patch
# User yexo <yexo@openttd.org>
# Date 2011-03-04 12:12:48
# Node ID 961c6d8bb3571977a6271b2e0fc2910fd5077871
# Parent  c35536c1a16e53b2c74402c68893f3592fe8f234

(svn r22181) -Fix (r20574): following a vehicle with a very high VehicleID was impossible

diff --git a/src/viewport.cpp b/src/viewport.cpp
--- a/src/viewport.cpp
+++ b/src/viewport.cpp
@@ -171,7 +171,7 @@ void DeleteWindowViewport(Window *w)
  * @param width Width of the viewport
  * @param height Height of the viewport
  * @param follow_flags Flags controlling the viewport.
- *        - If bit 31 is set, the lower 16 bits are the vehicle that the viewport should follow.
+ *        - If bit 31 is set, the lower 20 bits are the vehicle that the viewport should follow.
  *        - If bit 31 is clear, it is a #TileIndex.
  * @param zoom Zoomlevel to display
  */
@@ -197,7 +197,7 @@ void InitializeWindowViewport(Window *w,
 	if (follow_flags & 0x80000000) {
 		const Vehicle *veh;
 
-		vp->follow_vehicle = (VehicleID)(follow_flags & 0xFFFF);
+		vp->follow_vehicle = (VehicleID)(follow_flags & 0xFFFFF);
 		veh = Vehicle::Get(vp->follow_vehicle);
 		pt = MapXYZToViewport(vp, veh->x_pos, veh->y_pos, veh->z_pos);
 	} else {