From 92dded67bbcd72afbec947fa573c4ce8d6c7c5db Mon Sep 17 00:00:00 2001
From: Jonathan Stone <jstone@lucasfilm.com>
Date: Thu, 7 Jul 2022 18:56:34 -0700
Subject: [PATCH] Fix initialization warning in GLSL

This changelist refactors the implementation of mx_surface_transmission in GLSL, addressing an initialization warning when the function is called in WebGL.
---
 .../pbrlib/genglsl/lib/mx_transmission_refract.glsl   | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/libraries/pbrlib/genglsl/lib/mx_transmission_refract.glsl b/libraries/pbrlib/genglsl/lib/mx_transmission_refract.glsl
index 14df438860..d3b2cd7d5e 100644
--- a/libraries/pbrlib/genglsl/lib/mx_transmission_refract.glsl
+++ b/libraries/pbrlib/genglsl/lib/mx_transmission_refract.glsl
@@ -2,14 +2,19 @@
 
 vec3 mx_surface_transmission(vec3 N, vec3 V, vec3 X, vec2 alpha, int distribution, FresnelData fd)
 {
+    vec3 transmission;
     if ($refractionEnv)
     {
-        // Approximate the appearance of dielectric transmission as glossy
+        // Approximate the appearance of surface transmission as glossy
         // environment map refraction, ignoring any scene geometry that might
         // be visible through the surface.
         fd.refraction = true;
-        return mx_environment_radiance(N, V, X, alpha, distribution, fd);
+        transmission = mx_environment_radiance(N, V, X, alpha, distribution, fd);
+    }
+    else
+    {
+        transmission = $refractionColor;
     }
 
-    return $refractionColor;
+    return transmission;
 }