Added a cache library pointer to objects as a replacement for CL->GR

pointers.

Relationship between CacheLibrary, duplicator Objects and Groups is
difficult. There are a number of somewhat conflicting goals:
- CacheLibraries write out data for objects and dupli groups. Multiple
  objects can be stored in the same cache: CL *->* GR
- Objects can override a dupli group with different caches: OB *->1 CL
- As before, each object can be the duplicator for one group: OB *->1 GR

To combine these requirements, the first relationship will be made
indirect. Only the Object -> Group/CacheLib relations are explicit
pointers in the DNA. For finding all objects contained in a cache
library the usual recursive DNA tagging system must then be used.

1 files changed, 5 insertions, 1 deletions

diff --git a/release/scripts/startup/bl_ui/properties_object.py b/release/scripts/startup/bl_ui/properties_object.py
index 165ae5a3680..163c67a54cf 100644
--- a/release/scripts/startup/bl_ui/properties_object.py
+++ b/release/scripts/startup/bl_ui/properties_object.py
@@ -294,7 +294,11 @@ class OBJECT_PT_duplication(ObjectButtonsPanel, Panel):
 
         elif ob.dupli_type == 'GROUP':
             layout.prop(ob, "dupli_group", text="Group")
-            layout.prop(ob, "use_dupli_cache")
+            row = layout.row(align=True)
+            row.prop(ob, "cache_library")
+            sub = row.row(align=True)
+            sub.active = ob.cache_library is not None
+            sub.prop(ob, "use_dupli_cache", text="Read", toggle=True)
 
 
 class OBJECT_PT_relations_extras(ObjectButtonsPanel, Panel):