diff --git a/src/renderer.rs b/src/renderer.rs
index 82e8976..d1177b4 100644
--- a/src/renderer.rs
+++ b/src/renderer.rs
@@ -276,7 +276,7 @@ impl LightPath {
                     // in shadow or not.
                     // TODO: use proper ray offsets for avoiding self-shadowing
                     // rather than this hacky stupid stuff.
-                    *ray = Ray::new(pos + shadow_vec.normalized() * 0.0001,
+                    *ray = Ray::new(pos + shadow_vec.normalized() * 0.001,
                                     shadow_vec,
                                     self.time,
                                     true);
diff --git a/src/shading/surface_closure.rs b/src/shading/surface_closure.rs
index 55dd9a5..1ef4d80 100644
--- a/src/shading/surface_closure.rs
+++ b/src/shading/surface_closure.rs
@@ -185,7 +185,7 @@ impl SurfaceClosure for LambertClosure {
               uv: (f32, f32),
               wavelength: f32)
               -> (Vector, SpectralSample, f32) {
-        let nn = if dot(nor.into_vector().normalized(), inc.normalized()) <= 0.0 {
+        let nn = if dot(nor.into_vector(), inc) <= 0.0 {
                 nor.normalized()
             } else {
                 -nor.normalized()
@@ -199,7 +199,7 @@ impl SurfaceClosure for LambertClosure {
         let out = zup_to_vec(dir, nn);
         let filter = self.evaluate(inc, out, nor, wavelength);
 
-        (dir, filter, pdf)
+        (out, filter, pdf)
     }
 
     fn evaluate(&self, inc: Vector, out: Vector, nor: Normal, wavelength: f32) -> SpectralSample {