diff --git a/release.nix b/release.nix
deleted file mode 100644
index f88ea3f..0000000
--- a/release.nix
+++ /dev/null
@@ -1,26 +0,0 @@
-let
-  nixpkgs = fetchGit {
-    url = git://github.com/NixOS/nixpkgs-channels;
-    ref = "nixos-18.09";
-  };
-
-  config = {
-	packageOverrides = pkgs: rec {
-	  haskellPackages = pkgs.haskellPackages.override {
-        overrides = haskellPackagesNew: haskellPackagesOld: rec {
-           SVGFonts 
-            = pkgs.haskellPackages.callHackage "SVGFonts" "1.6.0.3" {};
-
-           project
-           = haskellPackagesNew.callCabal2nix "image-triangles" ../image-triangles {};
-
-		};
-	  };
-	};
-  };
-
-  pkgs = import nixpkgs {inherit config;};
-in
-  {
-   project = pkgs.haskellPackages.project;
-  }
diff --git a/shell.nix b/shell.nix
deleted file mode 100644
index 768d281..0000000
--- a/shell.nix
+++ /dev/null
@@ -1 +0,0 @@
-(import ./release.nix).project.env
diff --git a/src/Main.hs b/src/Main.hs
index 746fccd..0b026d2 100644
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -27,7 +27,7 @@ defaultOpts  = Options {
                   }
 
 genList :: StdGen -> [StdGen]
-genList = map mkStdGen . randoms
+genList = map snd . iterate (split . fst) . split 
 
 -- CL.rgb might be the wrong fn...
 tosRGB' :: (Ord b, Floating b) => Pixel G.RGB b -> CL.Colour b
@@ -48,10 +48,10 @@ renderTri image dimensions gen progress = Ren.makeTriangle (Ren.toPointList dime
         -- the following should be considered triangle shaders
         -- modify them to your liking, their outputs are expected to be in [0, 1]
         -- TODO: move these into a separate module
-        opacity' = 0.4
-        --opacity' = 1 - area
+        -- opacity' = 0.4
+        opacity' =  0.3 +  ((1 - progress) * 0.5)
         
-        area = max ((progress ** 2) * 0.2) 0.01
+        area = max ((progress ** 2) * 0.2) 0.02