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Just to add the rules reference, for confirmation of shnar's answer (p. 13 of rulebook) :
Some abilities require players to count the spaces from a figure to the target of the ability. When counting spaces for attacks and abilities, players ignore any non-obstacle terrain in those spaces (see “Terrain” on
page 18). The player just needs to verify that his target is in range for the ability to reach the target. If an ability affects figures within a specified number of spaces, line of sight is not needed unless specifically noted. However, when counting spaces for an ability, players cannot count spaces through a door because the spaces are not considered adjacent.