- | The negation of @v@.
negation :: T -> T
negation (V3 x y z) =
  V3 (0.0 - x) (0.0 - y) (0.0 - z)

negation :: T -> T
negation (V3 x y z) =
  V3 (0.0 - x) (0.0 - y) (0.0 - z)
negation (V3 x y z) =
  V3 (0.0 - x) (0.0 - y) (0.0 - z)