From 96d3846571e370ebfab9b8167a888051c0f6f32d Mon Sep 17 00:00:00 2001
From: Romain Guy <romainguy@curious-creature.com>
Date: Fri, 14 Sep 2018 09:44:34 -0700
Subject: [PATCH] Fix Schlick Fresnel when f90 < 1

---
 shaders/src/brdf.fs | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/shaders/src/brdf.fs b/shaders/src/brdf.fs
index 723d99390d..63c9285a46 100644
--- a/shaders/src/brdf.fs
+++ b/shaders/src/brdf.fs
@@ -151,8 +151,7 @@ float V_Neubelt(float NoV, float NoL) {
 
 vec3 F_Schlick(const vec3 f0, float f90, float VoH) {
     // Schlick 1994, "An Inexpensive BRDF Model for Physically-Based Rendering"
-    float f = pow5(1.0 - VoH);
-    return f + f0 * (f90 - f);
+    return f0 + (f90 - f0) * pow5(1.0 - VoH);
 }
 
 float F_Schlick(float f0, float f90, float VoH) {