diff --git a/src/Geometry/Intersect.hs b/src/Geometry/Intersect.hs
index b87c06f90..36614162e 100644
--- a/src/Geometry/Intersect.hs
+++ b/src/Geometry/Intersect.hs
@@ -23,20 +23,6 @@ intersectLineLine a b c d = do
     guard $ den /= 0
     let t = detV (a-c) (c-d)
     return $ a + (t/den) *^ (b-a)
---    | den == 0 = Nothing
---    | otherwise = Just $ a + (t/den) *^ (b - a)
-----    | otherwise = Just $ V2 (x1 + (x2 - x1) * t / den) (y1 + (y2 - y1) * t / den)
---  where
---    den = detV (a-b) (c-d)
-----    den = (x1 - x2) * (y3 - y4) - (y1 - y2) * (x3 - x4)
---    t = detV (a-c) (c-d) --x1 - x3) * (y3 - y4) - (y1 - y3) * (x3 - x4)
-----    t = (x1 - x3) * (y3 - y4) - (y1 - y3) * (x3 - x4)
-
----- note that the second argument is a vector, not the second point of the line
---intersectLinePlane :: Point3 -> Point3 -> Point3 -> Point3 -> Maybe Point3
---intersectLinePlane l v p n = case dot v n of
---    0 -> Nothing
---    x -> Just $ l + (dot (p - l) n / x) *.*.* v
 
 intersectLinePlaneAlong :: Point3 -> Point3 -> Point3 -> Point3 -> Maybe Float
 intersectLinePlaneAlong x y p n = do
@@ -50,13 +36,6 @@ intersectSegPlane x y p n = do
     d <- intersectLinePlaneAlong x y p n
     guard $ d >= 0 && d < 1
     return $ x + d *^ (y - x)
---case dot v n of
---    0 -> Nothing
---    x -> case dot (p - sp) n / x of
---        d | d >= 0 && d <= 1 -> Just $ sp + d *.*.* v
---        _ -> Nothing
---  where
---    v = ep - sp
 
 intersectSegSurface ::
     Point3 ->
@@ -124,21 +103,6 @@ intersectSegRay (V2 x1 y1) (V2 x2 y2) (V2 x3 y3) (V2 x4 y4)
     t' = (x1 - x3) * (y3 - y4) - (y1 - y3) * (x3 - x4)
     u' = (y1 - y2) * (x1 - x3) - (x1 - x2) * (y1 - y3)
 
----- | Similar to 'intersectSegLineFrom'', but this version is probably not correct...
---intersectSegLineext :: Point2 -> Point2 -> Point2 -> Point2 -> Maybe Point2
---{-# INLINE intersectSegLineext #-}
---intersectSegLineext (V2 x1 y1) (V2 x2 y2) (V2 x3 y3) (V2 x4 y4)
---    | den == 0 = Nothing
---    | den > 0 && (t' < 0 || u' < den || t' > den) =
---        Nothing
---    | den < 0 && (t' > 0 || u' > - den || t' < den) =
---        Nothing
---    | otherwise = Just $ V2 (x1 + (x2 - x1) * t' / den) (y1 + (y2 - y1) * t' / den)
---  where
---    den = (x1 - x2) * (y3 - y4) - (y1 - y2) * (x3 - x4)
---    t' = (x1 - x3) * (y3 - y4) - (y1 - y3) * (x3 - x4)
---    u' = (y1 - y2) * (x1 - x3) - (x1 - x2) * (y1 - y3)
-
 {- | Intersect a segment with a line.
  the line intersects with the first endpoint of the segment
  but NOT the second
@@ -156,8 +120,6 @@ intersectSegLine (V2 x1 y1) (V2 x2 y2) (V2 x3 y3) (V2 x4 y4)
     den = (x1 - x2) * (y3 - y4) - (y1 - y2) * (x3 - x4)
     t = (x1 - x3) * (y3 - y4) - (y1 - y3) * (x3 - x4)
 
---u'  = (y1-y2)*(x1-x3) - (x1-x2)*(y1-y3)
-
 -- | A test that should align with Just values from intersectSegSeg.
 intersectSegSegFullTest ::
     Point2 ->