switch to lambertian diffuse

1 files changed, 1 insertions, 1 deletions

diff --git a/lysenko.cginc b/lysenko.cginc
index 3026caf..d3c51f0 100644
--- a/lysenko.cginc
+++ b/lysenko.cginc
@@ -28,7 +28,7 @@ float Fd_OrenNayar(float roughness, float NoV, float NoL, float LoV) {
   float s = LoV - NoL * NoV;
   float t = lerp(1.0f, max(NoL, NoV), step(0.0f, s));
   float sigma2 = roughness * roughness;
-  float A = 1.0f + sigma2 * rcp(sigma2 + 0.13f) + 0.5f / (sigma2 + 0.33f);
+  float A = 1.0f - 0.5f * sigma2 / (sigma2 + 0.33f);
   float B = 0.45f * sigma2 / (sigma2 + 0.09f);
 
   return max(0.0f, NoL * (A + B * s / t));