Effects in specific bounds

[Glebka73a1]

Instead of making effects, like snow applied for the entire screen there should be a checkmark of making it for specific bounds (I mean height). For realism you can make the effect strength grow or shrink randomly outside the bounds, until it becomes 0 (make sure it wont go too far outside them). Again, if that head switching effect I suggested (#199) gets added, you can add that checkmark for it too. You can see the example of that in the attached image.