1 files changed, 2 insertions, 1 deletions
diff --git a/source/blender/draw/engines/eevee/shaders/bsdf_common_lib.glsl b/source/blender/draw/engines/eevee/shaders/bsdf_common_lib.glsl
index 1ac965d24ca..cb4d8931af0 100644
--- a/source/blender/draw/engines/eevee/shaders/bsdf_common_lib.glsl
+++ b/source/blender/draw/engines/eevee/shaders/bsdf_common_lib.glsl
@@ -24,6 +24,7 @@ float ior_from_f0(float f0)
   return (-f - 1.0) / (f - 1.0);
 }
 
+/* Simplified form of F_eta(eta, 1.0). */
 float f0_from_ior(float eta)
 {
   float A = (eta - 1.0) / (eta + 1.0);
@@ -69,7 +70,7 @@ float F_eta(float eta, float cos_theta)
 /* Fresnel color blend base on fresnel factor */
 vec3 F_color_blend(float eta, float fresnel, vec3 f0_color)
 {
-  float f0 = F_eta(eta, 1.0);
+  float f0 = f0_from_ior(eta);
   float fac = saturate((fresnel - f0) / (1.0 - f0));
   return mix(f0_color, vec3(1.0), fac);
 }