Fix reflection dir, matching filament

1 files changed, 2 insertions, 1 deletions

diff --git a/brdf.cginc b/brdf.cginc
index ee1a219..9e08325 100755
--- a/brdf.cginc
+++ b/brdf.cginc
@@ -70,6 +70,7 @@ float4 brdf(Pbr pbr, LightData data) {
   float3 specular = 0;
   float3 diffuse = 0;
 
+  // TODO parameterize
   float f0 = 0.04f;
   const float f90 = 1.0f;
 
@@ -94,7 +95,7 @@ float4 brdf(Pbr pbr, LightData data) {
     dfg = float3(1, 1, 1);
   }
   float3 f0_color = lerp(f0, pbr.albedo.xyz, pbr.metallic);
-  float3 energy_comp = 1.0f + f0_color * (1.0f / dfg.xxx - 1.0f);
+  float3 energy_comp = 1.0f + f0_color * (1.0f / (dfg.xxx + dfg.yyy) - 1.0f);
 
 #if defined(_CLEARCOAT)
   const float cc_f0 = 0.04f;