Refactor light sources

src/Geometry.hs

@@ -14,6 +14,7 @@ module Geometry
     , module Geometry.Intersect
     , module Geometry.Bezier
     , module Geometry.Vector
+    , module Geometry.Vector3D
     , module Geometry.LHS
     )
     where
@@ -21,6 +22,7 @@ import Geometry.Data
 import Geometry.Intersect
 import Geometry.Bezier
 import Geometry.Vector
+import Geometry.Vector3D
 import Geometry.LHS
 import Geometry.ConvexPoly