diff --git a/src/6.pbr/2.1.2.ibl_irradiance/2.1.2.irradiance_convolution.fs b/src/6.pbr/2.1.2.ibl_irradiance/2.1.2.irradiance_convolution.fs
index 18a664e..2988f00 100644
--- a/src/6.pbr/2.1.2.ibl_irradiance/2.1.2.irradiance_convolution.fs
+++ b/src/6.pbr/2.1.2.ibl_irradiance/2.1.2.irradiance_convolution.fs
@@ -19,8 +19,8 @@ void main()
     
     // tangent space calculation from origin point
     vec3 up    = vec3(0.0, 1.0, 0.0);
-    vec3 right = cross(up, N);
-    up            = cross(N, right);
+    vec3 right = normalize(cross(up, N));
+    up         = normalize(cross(N, right));
        
     float sampleDelta = 0.025;
     float nrSamples = 0.0;
diff --git a/src/6.pbr/2.2.1.ibl_specular/2.2.1.irradiance_convolution.fs b/src/6.pbr/2.2.1.ibl_specular/2.2.1.irradiance_convolution.fs
index 16f4f1e..9c660ba 100644
--- a/src/6.pbr/2.2.1.ibl_specular/2.2.1.irradiance_convolution.fs
+++ b/src/6.pbr/2.2.1.ibl_specular/2.2.1.irradiance_convolution.fs
@@ -14,8 +14,8 @@ void main()
     
     // tangent space calculation from origin point
     vec3 up    = vec3(0.0, 1.0, 0.0);
-    vec3 right = cross(up, N);
-    up            = cross(N, right);
+    vec3 right = normalize(cross(up, N));
+    up         = normalize(cross(N, right));
        
     float sampleDelta = 0.025;
     float nrSamples = 0.0f;
diff --git a/src/6.pbr/2.2.2.ibl_specular_textured/2.2.2.irradiance_convolution.fs b/src/6.pbr/2.2.2.ibl_specular_textured/2.2.2.irradiance_convolution.fs
index 16f4f1e..9c660ba 100644
--- a/src/6.pbr/2.2.2.ibl_specular_textured/2.2.2.irradiance_convolution.fs
+++ b/src/6.pbr/2.2.2.ibl_specular_textured/2.2.2.irradiance_convolution.fs
@@ -14,8 +14,8 @@ void main()
     
     // tangent space calculation from origin point
     vec3 up    = vec3(0.0, 1.0, 0.0);
-    vec3 right = cross(up, N);
-    up            = cross(N, right);
+    vec3 right = normalize(cross(up, N));
+    up         = normalize(cross(N, right));
        
     float sampleDelta = 0.025;
     float nrSamples = 0.0f;