tweaked Scene::calculateLightContribution() and scenes/cyls.fart slightly

git-svn-id: svn://anubis/fart/trunk@189 7f9b0f55-74a9-4bce-be96-3c2cd072584d

main/Scene.cc

@@ -311,7 +311,9 @@ double Scene::calculateLightContribution(const Ray & toLight,
         if ( hit.shape.isNull() )
             break;
 
-        if ( dist_so_far + hit.dist > dist_to_light )
+        double offset = hit.dist + 0.0001;
+
+        if ( dist_so_far + offset > dist_to_light )
             break;
 
         contrib *= hit.shape->getMaterial()->getTransparency();
@@ -319,7 +321,6 @@ double Scene::calculateLightContribution(const Ray & toLight,
         if ( contrib < SCENE_FACTOR_THRESHOLD )
             break;
 
-        double offset = hit.dist + 0.0001;
         dist_so_far += offset;
         currentRay = currentRay.shift(offset);
     }