reworked Vector::reflect() to reflect an INCOMING ray

git-svn-id: svn://anubis/fart/trunk@371 7f9b0f55-74a9-4bce-be96-3c2cd072584d

main/Scene.cc

@@ -155,7 +155,7 @@ Color Scene::traceRayRecurse(const Ray & ray, int depth, double factor)
             {
                 color *= (1.0 - reflectance);
                 Vector reflected_direction =
-                    (-ray.getDirection()).reflect(hit.normal);
+                    ray.getDirection().reflect(hit.normal);
                 Ray newRay(hit.position, reflected_direction);
                 Vector jitter_surface_point = newRay[0.0001];
                 Ray jitterNewRay(jitter_surface_point, reflected_direction);
@@ -257,7 +257,7 @@ Color Scene::computePhong(const refptr<Material> material,
                 Vector directionToLight = jitterPosition - surfacePoint;
                 directionToLight.normalize();
                 Vector reflectedLightDirection =
-                    directionToLight.reflect(surfaceNormal);
+                    (-directionToLight).reflect(surfaceNormal);
 
                 Ray surfaceToLight(surfacePoint, directionToLight);
                 Color light_contribution =