From 75439d0d6437a10b00b240aba75e9f12de20150b Mon Sep 17 00:00:00 2001
From: yum <yum.food.vr@gmail.com>
Date: Thu, 26 Feb 2026 14:21:05 -0800
Subject: Add emissions, remove impostor code

---
 math.cginc | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'math.cginc')

diff --git a/math.cginc b/math.cginc
index 3d7e92e..e2d4169 100755
--- a/math.cginc
+++ b/math.cginc
@@ -100,5 +100,10 @@ float3 blendNormalsHill12(float3 n0, float3 n1) {
   return normalize(n0 * dot(n0, n1) - n1 * n0.z);
 }
 
+// https://en.wikipedia.org/wiki/Relative_luminance
+float luminance(float3 rgb) {
+  return dot(float3(0.2126, 0.7152, 0.0722), rgb);
+}
+
 #endif  // __MATH_INC
 
-- 
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