1 files changed, 1 insertions, 1 deletions
diff --git a/pbr.cginc b/pbr.cginc
index 29bcedb..0088fa6 100755
--- a/pbr.cginc
+++ b/pbr.cginc
@@ -116,7 +116,7 @@ float normalFiltering(float3 geometric_normal, float perceptual_roughness) {
 }
 
 void propagateSmoothness(inout Pbr pbr) {
-  pbr.smoothness = 1.0f - normalFiltering(pbr.geometric_normal, 1.0f - pbr.smoothness);
+  pbr.smoothness = 1.0f - normalFiltering(pbr.normal, 1.0f - pbr.smoothness);
 
   pbr.roughness_perceptual = clamp(1.0f - pbr.smoothness, MIN_PERCEPTUAL_ROUGHNESS, 1);
   pbr.roughness = clamp(pbr.roughness_perceptual * pbr.roughness_perceptual, MIN_ROUGHNESS, 1);