1 files changed, 1 insertions, 1 deletions
diff --git a/pbr.cginc b/pbr.cginc
index 8ec69cb..25d6ece 100755
--- a/pbr.cginc
+++ b/pbr.cginc
@@ -133,7 +133,7 @@ float normalFiltering(float3 normal, float perceptual_roughness) {
   float kappa = 0.18;
   roughness = roughness + min(2 * Sigma, kappa);
 
-  return sqrt(roughness);
+  return saturate(sqrt(roughness));
 }
 
 void propagateSmoothness(inout Pbr pbr) {