updated extrudes scene, fixed Extrude objects to return backfaces so that boolean objects work properly

git-svn-id: svn://anubis/fart/trunk@280 7f9b0f55-74a9-4bce-be96-3c2cd072584d

scenes/extrudes.fart

@@ -3,14 +3,15 @@ scene
 {
     options
     {
-        multisample 3
+        ambient_occlusion 2
+        multisample 2
         exposure 1.2
     }
 
     camera
     {
         position <0, -10, 10>
-        look_at <0, 0, 1>
+        look_at <0, 0, 2>
     }
 
     light { position <10, -12, 8> }
@@ -24,30 +25,29 @@ scene
         }
     }
 
-    extrude
+    subtract
     {
-        polygon
-        {
-            <3, 0>
-            <1, 1>
-            <2, 3>
-            <-1, 1>
-            <-3, 2>
-            <-2, -1>
-            <-3, -3>
-            <-1, -2>
-            <1, -4>
-            <1, -1>
-        }
-        offset 3
+        extrude { ngon 5, 6 offset 2 }
+        extrude { ngon 5, 5 offset 3 translate <0, 0, -0.5> }
         material { color <1, 0.7, 0> }
-        translate <-3, 0, 0>
     }
 
-    extrude
+    union
     {
-        ngon 5, 2
-        offset 1
-        translate <4, 0, 0>
+        extrude
+        {
+            ngon 6, 2
+            offset 3 { scale 0.5 position <4, 0> }
+            offset 3
+            offset 1 { scale 0 }
+        }
+        extrude
+        {
+            ngon 6, 2
+            offset 3 { scale 0.5 position <-4, 0> }
+            offset 3
+            offset 1 { scale 0 }
+        }
+        material { color <0, 0.9, 0.9> }
     }
 }