diff --git a/src/lib.rs b/src/lib.rs
index 8b7384d..a6a1101 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -309,9 +309,7 @@ impl Core {
 					assert!(hit.incident.dir.is_normalized());
 					let reflector = Lambertian;
 					let in_lm = 1.0;
-					let out_cd = in_lm
-						* hit.normal.dot(-hit.incident.dir)
-						* reflector.brdf(hit.normal, hit.incident.dir, -ray.dir);
+					let out_cd = in_lm * reflector.brdf(hit.normal, hit.incident.dir, -ray.dir);
 					let weight = accum_normalizator * (-0.5 * d2 / sigma2).exp();
 					total_cd += weight * out_cd;
 				}