fix self shadows

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;