Instead of applying a transform for every RenderObject, pass down an Offset for where to paint.

sky/sdk/lib/example/game/lib/sprite_box.dart

Index: sky/sdk/lib/example/game/lib/sprite_box.dart
diff --git a/sky/sdk/lib/example/game/lib/sprite_box.dart b/sky/sdk/lib/example/game/lib/sprite_box.dart
index 6e9d3453c04c760ef13b1e9704c23deba6dc94b4..d62cbd65126edf00a291bae9974f6dcc6e304ce6 100644
--- a/sky/sdk/lib/example/game/lib/sprite_box.dart
+++ b/sky/sdk/lib/example/game/lib/sprite_box.dart
@@ -251,10 +251,11 @@ class SpriteBox extends RenderBox {
     _rootNode._invalidateToBoxTransformMatrix();
   }
 
-  void paint(RenderCanvas canvas) {
+  void paint(RenderCanvas canvas, Offset offset) {
     canvas.save();
 
     // Move to correct coordinate space before drawing
+    canvas.translate(offset.dx, offset.dy);
     canvas.concat(transformMatrix.storage);
 
     // Draw the sprite tree