[lowfighter]

This is not really working unfortunately, take any object,say first object in fmb, open the mat file, the distance is set there anyway to 10000. Now go in game and measure the pop up distance for that object (I did that long time ago). The pop up will be some 3000 meters for first object with normal view if I remember correctly. The pop up distance is somewhere else, and I suspect it's in the .msh file... The houses having the greatest visibility range are the Norway ones, about 7000m (not sure though about the Slovakia castles and churches they might be even more "visible").

Find the .mat file used for the specific object.
There you will find 2 parameters:
VisibleDistanceNear 0.0 // Float 0.0 - near, 1.0 - far
VisibleDistanceFar 10000
The number is the view distance in meters