fixed parser bug with sphere_items, made VFOVNode inherit from NumberNode, updated sample scene infinity.fart, reading scene from a file appears to be working!

git-svn-id: svn://anubis/fart/trunk@175 7f9b0f55-74a9-4bce-be96-3c2cd072584d

scenes/infinity.fart

@@ -10,21 +10,21 @@ scene
 
     camera
     {
-        position <0, -2, 0>
+        position <0, -1.9, 0>
         look_at <0, 0, 0>
         up <0, 0, 1>
     }
 
-    plane { position <1, 0, 0>, -2 }
-    plane { position <-1, 0, 0>, -2 }
-    plane { position <0, 1, 0>, -2 }
-    plane { position <0, -1, 0>, -2 }
-    plane { position <0, 0, 1>, -2 }
-    plane { position <0, 0, -1>, -2 }
+    plane { position <1, 0, 0>, 2 }
+    plane { position <-1, 0, 0>, 2 }
+    plane { position <0, 1, 0>, 2 }
+    plane { position <0, -1, 0>, 2 }
+    plane { position <0, 0, 1>, 2 }
+    plane { position <0, 0, -1>, 2 }
 
     sphere
     {
-        radius 1.0
+        radius 0.5
         material
         {
             reflectance 0.2
@@ -33,4 +33,9 @@ scene
             shininess 80
         }
     }
+
+    light
+    {
+        position <1, -1, 1>
+    }
 }