updated subtract-subtract.fart and .todo

git-svn-id: svn://anubis/fart/branches/2009-03-09_intersect_returning_normals@201 7f9b0f55-74a9-4bce-be96-3c2cd072584d

scenes/subtract-subtract.fart

@@ -3,7 +3,7 @@ scene
 {
     options
     {
-        multisample 2
+        multisample 3
     }
 
     camera
@@ -17,6 +17,15 @@ scene
         position <-1, -3, 4>
     }
 
+    plane
+    {
+        position <0, 0, 1>, 1
+        material
+        {
+            color <0, 1, 1>
+        }
+    }
+
     subtract
     {
         box