io_scene_cs : adding map nodes export

Hello,

  here's a patch for io_scene_cs to export Blender "Empties" as CS map
nodes (iMapNode)
without changing exporting behaviour for empties marked as dupli-groups.
Does it look correct ? At least it does what I need, but I don't use
dupligroups (yet).

It only supports exporting position, not [xyz]vector nor key tags.

Index: scripts/blender/io_scene_cs/io/object.py
===================================================================
--- scripts/blender/io_scene_cs/io/object.py    (révision 38824)
+++ scripts/blender/io_scene_cs/io/object.py    (copie de travail)
@@ -469,6 +469,10 @@
         for ob in self.dupli_group.objects:
           if not ob.parent:
             ob.AsCS(func, depth, transform=self.relative_matrix,
name=self.uname)
+    else:
+      func(' '*depth +'<node name="%s">'%(name))
+      func(' '*depth +'  <position x="%f" z="%f" y="%f" />'%
tuple(self.relative_matrix.to_translation()))
+      func(' '*depth +'</node>')

     #Handle children: translate to top level.
     for obj in self.children:
@@ -520,7 +524,7 @@
       return True
     return False

-  # The export of Empty objects depends of their componants
+  # The export of Empty objects depends of their components
   if self.type == 'EMPTY':
     # Groups of objects are exported if the group itself and
     # all its composing elements are visible
@@ -540,9 +544,9 @@
             if not gr.dupli_group.CheckVisibility():
               return False
     else:
-      # Empty objects which are not groups are not exported
-      # (notice that each of their componants can be individually exported)
-      return False
+      # Empty objects which are not groups are exported as map nodes
+      # (notice that each of their components can be individually exported)
+      return True

   # All other types of objects are always exportable (if they are visible)
   return True

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