1 files changed, 5 insertions, 0 deletions
diff --git a/math.cginc b/math.cginc
index a12040a..17ce86f 100644
--- a/math.cginc
+++ b/math.cginc
@@ -10,6 +10,11 @@ float pow5(float x)
   return (tmp * tmp) * x;
 }
 
+float wrapNoL(float NoL, float factor) {
+		// https://www.iro.umontreal.ca/~derek/files/jgt_wrap_final.pdf
+    return pow(max(1E-4, (NoL + factor) / (1 + factor)), 1 + factor);
+}
+
 #endif  // __MATH_INC