Hey, @Lexx ! Visibility is determined by whether or not the trace channel RangeTrace is blocked. You can make units block line of sight by adding a collision box to the unit that is set up to block RangeTrace in its collision settings. Other than this you need to make sure that the unit does not block its own line of sight, so on unit activation set collision to false for this collision box, and then set collision to true again on unit deactivation.