From 28a9b5e03e8061e3a4002e653d521fb34c44c11b Mon Sep 17 00:00:00 2001
From: austin <austin@austinhoover.net>
Date: Wed, 16 Feb 2022 18:55:39 -0500
Subject: [PATCH] fix self shadows

---
 assets/Shaders/FragmentShader.fs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/assets/Shaders/FragmentShader.fs b/assets/Shaders/FragmentShader.fs
index fd597772..72fb448f 100644
--- a/assets/Shaders/FragmentShader.fs
+++ b/assets/Shaders/FragmentShader.fs
@@ -185,6 +185,14 @@ float ShadowCalculation(vec4 fragPosLightSpace, vec3 lightDir, vec3 normal){
         shadow = 0.0;
     }
 
+    //calculate dot product, if it is >0 we know they're parallel-ish therefore should disregard the shadow mapping
+    //ie the fragment is already facing away from the light source
+    float dotprod = dot(normalize(lightDir),normalize(normal));
+
+    if(dotprod > 0.0){
+        shadow = 0.0;
+    }
+
     // shadow = currentDepth;
 
     return shadow;