Here's a simple example of line of sight and attack roll modifiers. A fereldan freeman (warrior, armed with crossbow) encounters three skeletons in a forest.
Skeleton A is in line of sight and within (short) range. Roll a normal attack roll. That was easy.
Skeleton C is within (short) range but is standing behind the hut out of line of sight. No attack this turn.
I guess we could agree that Skeleton B is within (short) range, in line of sight but partially covered by the (grass) hut. Should count as light cover with a -2 modifier to the attack roll. But how do we decide line of sight and cover? Since there is a game master present we could solve this in the most practical way without exact rules. In miniature games (without a game master) that wouldn't work long. In HeroClix you would draw a line from the center of the attacker's square to the center of the target's square to decide line of sight and cover. In this case the hut (2x2 squares of blocking terrain) would prevent line of sight. In Star Wars Miniatures you would draw a line from a corner of the attacker's square (in this case the bottom left) to all four corners av the target's square. The skeleton would have cover as at least one of the lines is blocked by the hut and at least one of the lines is not. However, these examples of rules can be difficult to use on other maps (of other games) where terrain isn't placed (centered) in squares.
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