diff --git a/src/6.pbr/1.1.lighting/1.1.pbr.fs b/src/6.pbr/1.1.lighting/1.1.pbr.fs
index bd56ea4..5333e96 100644
--- a/src/6.pbr/1.1.lighting/1.1.pbr.fs
+++ b/src/6.pbr/1.1.lighting/1.1.pbr.fs
@@ -85,7 +85,7 @@ void main()
         vec3 F    = fresnelSchlick(clamp(dot(H, V), 0.0, 1.0), F0);
            
         vec3 numerator    = NDF * G * F; 
-        float denominator = 4 * max(dot(N, V), 0.0) * max(dot(N, L), 0.0) + 0.0001; // + 0.0001 to prevent divide by zero
+        float denominator = 4.0 * max(dot(N, V), 0.0) * max(dot(N, L), 0.0) + 0.0001; // + 0.0001 to prevent divide by zero
         vec3 specular = numerator / denominator;
         
         // kS is equal to Fresnel
diff --git a/src/6.pbr/1.2.lighting_textured/1.2.pbr.fs b/src/6.pbr/1.2.lighting_textured/1.2.pbr.fs
index 6a687d6..4554b2f 100644
--- a/src/6.pbr/1.2.lighting_textured/1.2.pbr.fs
+++ b/src/6.pbr/1.2.lighting_textured/1.2.pbr.fs
@@ -112,7 +112,7 @@ void main()
         vec3 F    = fresnelSchlick(max(dot(H, V), 0.0), F0);
            
         vec3 numerator    = NDF * G * F; 
-        float denominator = 4 * max(dot(N, V), 0.0) * max(dot(N, L), 0.0) + 0.0001; // + 0.0001 to prevent divide by zero
+        float denominator = 4.0 * max(dot(N, V), 0.0) * max(dot(N, L), 0.0) + 0.0001; // + 0.0001 to prevent divide by zero
         vec3 specular = numerator / denominator;
         
         // kS is equal to Fresnel
diff --git a/src/6.pbr/2.1.1.ibl_irradiance_conversion/2.1.1.pbr.fs b/src/6.pbr/2.1.1.ibl_irradiance_conversion/2.1.1.pbr.fs
index cd5365a..3477370 100644
--- a/src/6.pbr/2.1.1.ibl_irradiance_conversion/2.1.1.pbr.fs
+++ b/src/6.pbr/2.1.1.ibl_irradiance_conversion/2.1.1.pbr.fs
@@ -86,7 +86,7 @@ void main()
         vec3 F    = fresnelSchlick(max(dot(H, V), 0.0), F0);
            
         vec3 numerator    = NDF * G * F; 
-        float denominator = 4 * max(dot(N, V), 0.0) * max(dot(N, L), 0.0) + 0.0001; // + 0.0001 to prevent divide by zero
+        float denominator = 4.0 * max(dot(N, V), 0.0) * max(dot(N, L), 0.0) + 0.0001; // + 0.0001 to prevent divide by zero
         vec3 specular = numerator / denominator;
         
         // kS is equal to Fresnel
diff --git a/src/6.pbr/2.1.2.ibl_irradiance/2.1.2.pbr.fs b/src/6.pbr/2.1.2.ibl_irradiance/2.1.2.pbr.fs
index 5c42ba8..c949ee1 100644
--- a/src/6.pbr/2.1.2.ibl_irradiance/2.1.2.pbr.fs
+++ b/src/6.pbr/2.1.2.ibl_irradiance/2.1.2.pbr.fs
@@ -89,7 +89,7 @@ void main()
         vec3 F    = fresnelSchlick(max(dot(H, V), 0.0), F0);        
         
         vec3 numerator    = NDF * G * F;
-        float denominator = 4 * max(dot(N, V), 0.0) * max(dot(N, L), 0.0) + 0.0001; // + 0.0001 to prevent divide by zero
+        float denominator = 4.0 * max(dot(N, V), 0.0) * max(dot(N, L), 0.0) + 0.0001; // + 0.0001 to prevent divide by zero
         vec3 specular = numerator / denominator;
         
          // kS is equal to Fresnel
diff --git a/src/6.pbr/2.2.1.ibl_specular/2.2.1.pbr.fs b/src/6.pbr/2.2.1.ibl_specular/2.2.1.pbr.fs
index 5b959e1..1b4bb2f 100644
--- a/src/6.pbr/2.2.1.ibl_specular/2.2.1.pbr.fs
+++ b/src/6.pbr/2.2.1.ibl_specular/2.2.1.pbr.fs
@@ -96,7 +96,7 @@ void main()
         vec3 F    = fresnelSchlick(max(dot(H, V), 0.0), F0);        
         
         vec3 numerator    = NDF * G * F;
-        float denominator = 4 * max(dot(N, V), 0.0) * max(dot(N, L), 0.0) + 0.0001; // + 0.0001 to prevent divide by zero
+        float denominator = 4.0 * max(dot(N, V), 0.0) * max(dot(N, L), 0.0) + 0.0001; // + 0.0001 to prevent divide by zero
         vec3 specular = numerator / denominator;
         
          // kS is equal to Fresnel
diff --git a/src/6.pbr/2.2.2.ibl_specular_textured/2.2.2.pbr.fs b/src/6.pbr/2.2.2.ibl_specular_textured/2.2.2.pbr.fs
index 563f43b..b7c2436 100644
--- a/src/6.pbr/2.2.2.ibl_specular_textured/2.2.2.pbr.fs
+++ b/src/6.pbr/2.2.2.ibl_specular_textured/2.2.2.pbr.fs
@@ -125,7 +125,7 @@ void main()
         vec3 F    = fresnelSchlick(max(dot(H, V), 0.0), F0);        
         
         vec3 numerator    = NDF * G * F;
-        float denominator = 4 * max(dot(N, V), 0.0) * max(dot(N, L), 0.0) + 0.0001; // + 0.0001 to prevent divide by zero
+        float denominator = 4.0 * max(dot(N, V), 0.0) * max(dot(N, L), 0.0) + 0.0001; // + 0.0001 to prevent divide by zero
         vec3 specular = numerator / denominator;
         
          // kS is equal to Fresnel