-- | Returns the dot product of two points (taken as three-vectors).
dot :: Point -> Point -> Double
dot (x1, y1, z1) (x2, y2, z2) =
(x2 - x1)^(2::Int) + (y2 - y1)^(2::Int) + (z2 - z1)^(2::Int)
-- | Returns the dot product of two points (taken as three-vectors).
dot :: Point -> Point -> Double
dot (x1, y1, z1) (x2, y2, z2) =
(x2 - x1)^(2::Int) + (y2 - y1)^(2::Int) + (z2 - z1)^(2::Int)