Experimental support to proxy one shape for another in IFC

src/ifcblenderexport/blenderbim/__init__.py

@@ -58,6 +58,7 @@ classes = (
     operator.RemoveClassification,
     operator.FetchLibraryInformation,
     operator.FetchExternalMaterial,
+    operator.FetchObjectPassport,
     prop.BIMProperties,
     prop.BIMLibrary,
     prop.MapConversion,

src/ifcblenderexport/blenderbim/data/doc/proxy.opass

@@ -0,0 +1,6 @@
+{
+    "blender": {
+        "uri": "high-res.blend",
+        "identification": "high-res"
+    }
+}

src/ifcblenderexport/blenderbim/operator.py

@@ -680,3 +680,29 @@ class FetchLibraryInformation(bpy.types.Operator):
     def execute(self, context):
         # TODO
         return {'FINISHED'}
+
+
+class FetchObjectPassport(bpy.types.Operator):
+    bl_idname = 'bim.fetch_object_passport'
+    bl_label = 'Fetch Object Passport'
+
+    def execute(self, context):
+        for document in bpy.context.active_object.BIMObjectProperties.documents:
+            if not document.file[-6:] == '.opass':
+                continue
+            with open(os.path.join(bpy.context.scene.BIMProperties.data_dir, 'doc', document.file)) as f:
+                self.object_pass = json.load(f)
+            if 'blender' in self.object_pass:
+                self.fetch_blender()
+        return {'FINISHED'}
+
+    def fetch_blender(self):
+        identification = self.object_pass['blender']['identification']
+        uri = os.path.join(bpy.context.scene.BIMProperties.data_dir,
+                           'doc',
+                           self.object_pass['blender']['uri'])
+        bpy.ops.wm.link(
+            filename=identification,
+            directory=os.path.join(uri, 'Mesh')
+        )
+        bpy.context.active_object.data = bpy.data.meshes[identification]

src/ifcblenderexport/blenderbim/ui.py

@@ -55,6 +55,9 @@ class BIM_PT_object(Panel):
         row.prop(props, 'applicable_documents', text='')
         row.operator('bim.add_document')
 
+        row = layout.row()
+        row.operator('bim.fetch_object_passport')
+
         for index, document in enumerate(props.documents):
             row = layout.row(align=True)
             row.prop(document, 'file', text='')