Fix #3

If we don't reference the SceneNode from each SceneObject, we can't get
the SceneNode from an ObjInterface. For some strange reason, plClient
overrides the plDrawableSpans SceneNode at runtime. This caused the DSpan
to be removed from all nodes.... :/

korman/exporter/manager.py

@@ -83,6 +83,7 @@ class ExportManager:
         if node: # All objects must be in the scene node
             if isinstance(pl, plSceneObject):
                 node.addSceneObject(pl.key)
+                pl.sceneNode = node.key
             elif pl.ClassIndex() in _pool_types:
                 node.addPoolObject(pl.key)