From 80a751f1b5028c64e02c904522bc6ee2bc19aa9b Mon Sep 17 00:00:00 2001
From: Faerbit <faerbit@gmail.com>
Date: Thu, 4 Dec 2014 13:26:06 +0100
Subject: [PATCH] Improving bias on slopes.

---
 Shader/phong.fsh | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Shader/phong.fsh b/Shader/phong.fsh
index d1b4031..74564e1 100644
--- a/Shader/phong.fsh
+++ b/Shader/phong.fsh
@@ -59,7 +59,8 @@ void main()
     }
 
     // shadows 
-    float bias = 0.001;
+    float bias = 0.001*tan(acos(clamp(dot(vNormal, -directionalLightVector), 0.0, 1.0)));
+    bias = clamp(bias, 0.0, 0.01);
     vec3 biasedShadowCoord = vec3(shadowCoord);
     biasedShadowCoord.z = shadowCoord.z - bias;
     float visibility = 1.0;