From 5de763721d866f38a299aa04f8cc57ede533c5b1 Mon Sep 17 00:00:00 2001
From: Niklas Harrysson <niklas.harrysson@gmail.com>
Date: Fri, 15 Sep 2023 22:06:07 +0200
Subject: [PATCH] Fix bug with emission under coat in Standard Surface.

---
 libraries/bxdf/standard_surface.mtlx | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/libraries/bxdf/standard_surface.mtlx b/libraries/bxdf/standard_surface.mtlx
index 843885aa50..c7de68929a 100644
--- a/libraries/bxdf/standard_surface.mtlx
+++ b/libraries/bxdf/standard_surface.mtlx
@@ -386,6 +386,10 @@
       <input name="in1" type="float" nodename="coat_ior_to_F0_sqrt" />
       <input name="in2" type="float" nodename="coat_ior_to_F0_sqrt" />
     </multiply>
+    <subtract name="one_minus_coat_ior_to_F0" type="float">
+      <input name="in1" type="float" value="1.0" />
+      <input name="in2" type="float" nodename="coat_ior_to_F0" />
+    </subtract>
     <multiply name="emission_weight" type="color3">
       <input name="in1" type="color3" interfacename="emission_color" />
       <input name="in2" type="float" interfacename="emission" />
@@ -398,8 +402,8 @@
       <input name="in2" type="color3" interfacename="coat_color" />
     </multiply>
     <generalized_schlick_edf name="coat_emission_edf" type="EDF">
-      <input name="color0" type="color3" value="1.0, 1.0, 1.0" />
-      <input name="color90" type="color3" nodename="coat_ior_to_F0" channels="rrr" />
+      <input name="color0" type="color3" nodename="one_minus_coat_ior_to_F0" channels="rrr" />
+      <input name="color90" type="color3" value="0.0, 0.0, 0.0" />
       <input name="exponent" type="float" value="5.0" />
       <input name="base" type="EDF" nodename="coat_tinted_emission_edf" />
     </generalized_schlick_edf>