From b377dd05175d5bffaeef9c55051cd396c127daef Mon Sep 17 00:00:00 2001
From: yum <yum.food.vr@gmail.com>
Date: Thu, 20 Mar 2025 18:57:24 -0700
Subject: Add false color visualizer

Based on Sotalo's Furality talk - I wanted a way to visualize when my
albedo is outside the recommended [0.025, 90]% brightness range. This
feature does that. Dark is rendered red, bright is rendered blue.
---
 math.cginc | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

(limited to 'math.cginc')

diff --git a/math.cginc b/math.cginc
index 436cc56..2f05054 100644
--- a/math.cginc
+++ b/math.cginc
@@ -194,6 +194,8 @@ float3 blendNormalsHill12(float3 n0, float3 n1) {
   return normalize(n0 * dot(n0, n1) - n1 * n0.z);
 }
 
-#endif  // __MATH_INC
-
+float3 luminance(float3 color) {
+  return dot(color, float3(0.2126, 0.7152, 0.0722));
+}
 
+#endif  // __MATH_INC
-- 
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