diff --git a/occlusion-formula.txt b/occlusion-formula.txt
new file mode 100644
index 0000000..313a2e1
--- /dev/null
+++ b/occlusion-formula.txt
@@ -0,0 +1,3 @@
+Occulision:
+
+mask = clamp((1.0 - dot(normalize(playerLoc - cameraPos), normalize(pixelLoc - cameraPos))) * pixelDepth / 40.0, 0.0, 1.0)