diff --git a/Assignments/Assignment1/Application1.cpp b/Assignments/Assignment1/Application1.cpp
index 5462e08..aeacbbc 100644
--- a/Assignments/Assignment1/Application1.cpp
+++ b/Assignments/Assignment1/Application1.cpp
@@ -212,7 +212,7 @@ Vec3fa Application1::renderPixelMIS(float x, float y, const ISPCCamera& camera,
         
         Vec3fa diffuse = Material__eval(material_array, matId, brdf, wo, sample, wi.v);
 
-        Lw *= M_PI * diffuse;
+        Lw *= diffuse / wi.pdf;
 
         ray = Ray(sample.P,wi.v,EPS,inf);
 
@@ -307,7 +307,7 @@ Vec3fa Application1::renderPixelNextEventEstimation(float x, float y, const ISPC
         
         Vec3fa diffuse = Material__eval(material_array, matId, brdf, wo, sample, wi.v);
 
-        Lw *= M_PI * diffuse;
+        Lw *= diffuse / wi.pdf;
 
         ray = Ray(sample.P,wi.v,EPS,inf);
 
@@ -373,7 +373,7 @@ Vec3fa Application1::renderPixelPathTracer(float x, float y, const ISPCCamera& c
         
         Vec3fa diffuse = Material__eval(material_array, matId, brdf, wo, sample, wi.v);
 
-        Lw *= M_PI * diffuse;
+        Lw *= diffuse / wi.pdf;
 
         ray = Ray(sample.P,wi.v,EPS,inf);