I always measure from hex
center to hex
center.
It's just simpler and avoids arguments. Strict? Harsh? Yes, but I'm old and tired of arguments and weird angles to avoid that "occupied" sliver.
But if you're following the strict RAW, "any portion" to "any portion" means even the smallest sliver counts, and your last questions is answered with "none".
Quote:
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In order for a single occupied hex to be "in the way" it would have to be between the firer and the target exactly along a hex row or hex spine, otherwise the firer could select a line of fire that does not go through the intervening hex. This is true even if 99% of the target is otherwise behind the occupied hex. A similar situation arises with an intervening obstacle.
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Yup. Which is why a canny GM will try to have multiple foes or obstacles littering the battlefield to create lots of "occupied" hexes.