Calling this function will make the group fall down from
it's track till it reaches "height_above_ground" distance from the ground
fall_through_dynamic_objects could be YES or NO. the idea here is that if for example we have a runner (human being)
and the track is very high in the air then it might fall on the top of the airplanes so we would like it to fall through the planes on the ground
if on the other hand there are cars on the ground we would like it to fall on the top of the cars and not to pass through.
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