diff --git a/src/Picture/Base.hs b/src/Picture/Base.hs
index 0453c9ae5..b28abc175 100644
--- a/src/Picture/Base.hs
+++ b/src/Picture/Base.hs
@@ -8,7 +8,6 @@ module Picture.Base (
     blank,
     polygon,
     polygonWire,
-    polygonZ,
     polygonCol,
     poly3,
     poly3Col,
@@ -73,12 +72,6 @@ polygon = map f . polyToTris
   where
     f (V2 x y) = Verx (V3 x y 0) black [] BottomLayer polyNum
 
-polygonZ :: [Point2] -> Float -> Picture
-{-# INLINE polygonZ #-}
-polygonZ ps z = map (f . zeroZ) $ polyToTris ps
-  where
-    f pos = Verx pos black [z] BottomLayer polyzNum
-
 polygonCol :: [(Point2, RGBA)] -> Picture
 {-# INLINE polygonCol #-}
 polygonCol = polyToTris . map f
diff --git a/src/Picture/Data.hs b/src/Picture/Data.hs
index 7005f90b5..2016ac3de 100644
--- a/src/Picture/Data.hs
+++ b/src/Picture/Data.hs
@@ -1,5 +1,5 @@
-{-# LANGUAGE DeriveGeneric #-}
 {-# LANGUAGE DeriveAnyClass #-}
+{-# LANGUAGE DeriveGeneric #-}
 {-# LANGUAGE StrictData #-}
 {-# LANGUAGE TemplateHaskell #-}
 
@@ -36,7 +36,6 @@ numLayers = length [minBound :: Layer .. maxBound]
 
 data ShadNum
     = PolyShad
-    | PolyzShad
     | BezShad
     | TextShad
     | ArcShad
@@ -52,19 +51,17 @@ _unShadNum = fromEnum
 toShadNum :: Int -> ShadNum
 toShadNum = toEnum
 
-polyNum, polyzNum, bezNum, textNum, arcNum, ellNum :: ShadNum
+polyNum, bezNum, textNum, arcNum, ellNum :: ShadNum
 {-# INLINE polyNum #-}
-{-# INLINE polyzNum #-}
 {-# INLINE bezNum #-}
 {-# INLINE textNum #-}
 {-# INLINE arcNum #-}
 {-# INLINE ellNum #-}
 polyNum = toShadNum 0
-polyzNum = toShadNum 1
-bezNum = toShadNum 2
-textNum = toShadNum 3
-arcNum = toShadNum 4
-ellNum = toShadNum 5
+bezNum = toShadNum 1
+textNum = toShadNum 2
+arcNum = toShadNum 3
+ellNum = toShadNum 4
 
 type Picture = [Verx]
 
diff --git a/src/Preload/Render.hs b/src/Preload/Render.hs
index 6ed869388..993bd2b20 100644
--- a/src/Preload/Render.hs
+++ b/src/Preload/Render.hs
@@ -133,8 +133,6 @@ preloadRender = do
         makeShader "dualTwoD/character" [vert, frag] [3, 4, 2] pmTriangles
             >>= _1 (vaddTextureNoFilter "data/texture/charMap.png")
     -- this should really be a 2d texture array
-    basicTweakZShad <- makeShader "dualTwoD/basicTweakZ" [vert, frag] [4, 4] pmTriangles
-    -- texture shaders, no textures attached
 
     screentexturevbo <- mglCreate glCreateBuffers
     withArray (concat cornerList) $ \ptr ->
@@ -196,12 +194,11 @@ preloadRender = do
     -- reset to default framebuffer, ready for drawing direct to screen
     glBindFramebuffer GL_FRAMEBUFFER 0
 
-    shadV <- MV.new 6
+    shadV <- MV.new 5
     zipWithM_
         (MV.write shadV)
-        [0 .. 5]
+        [0 .. 4]
         [ bslist -- note the ordering is very important
-        , basicTweakZShad -- ShadNum
         , bezierQuadShader
         , cslist
         , aslist
diff --git a/src/Shader/Poke.hs b/src/Shader/Poke.hs
index 3838106ea..143c51dcc 100644
--- a/src/Shader/Poke.hs
+++ b/src/Shader/Poke.hs
@@ -427,11 +427,10 @@ pokeLayVerx vbos counts vx = do
 pokeStride :: Int -> Int
 {-# INLINE pokeStride #-}
 pokeStride 0 = 7
-pokeStride 1 = 8
-pokeStride 2 = 11
-pokeStride 3 = 9
-pokeStride 4 = 10
-pokeStride 5 = 7
+pokeStride 1 = 11
+pokeStride 2 = 9
+pokeStride 3 = 10
+pokeStride 4 = 7
 pokeStride _ = undefined
 
 poke34 :: Ptr Float -> Point3 -> Point4 -> IO ()