Hi, Don't know if this has ever been done or if it can be done. Can you make things appear on and off inside a skybox - yhis would give the impression that the outer environment is changing. For example the convoy map with the two huge vechilces yo battle is out on. Could you make a skybox with a camera inside it attached to a func_train so that it would appear that your two cars were going through a canyon or something? you could put objects etc, change the terrain. and then it would look like the whold map is moving.