New feature to visualise IFC diff changes

src/ifcblenderexport/blenderbim/bim/__init__.py

@@ -118,6 +118,7 @@ if bpy is not None:
         operator.OpenView,
         operator.ActivateView,
         operator.ExecuteIfcDiff,
+        operator.VisualiseDiff,
         operator.ExportClashSets,
         operator.ImportClashSets,
         operator.AddClashSet,

src/ifcblenderexport/blenderbim/bim/operator.py

@@ -1352,6 +1352,27 @@ class SelectDiffJsonFile(bpy.types.Operator):
         return {'RUNNING_MODAL'}
 
 
+class VisualiseDiff(bpy.types.Operator):
+    bl_idname = 'bim.visualise_diff'
+    bl_label = 'Visualise Diff'
+
+    def execute(self, context):
+        with open(bpy.context.scene.BIMProperties.diff_json_file, 'r') as file:
+            diff = json.load(file)
+        for obj in bpy.context.visible_objects:
+            obj.color = (1., 1., 1., .2)
+            global_id = obj.BIMObjectProperties.attributes.get('GlobalId')
+            if not global_id:
+                continue
+            if global_id.string_value in diff['deleted']:
+                obj.color = (1., 0., 0., .2)
+            elif global_id.string_value in diff['added']:
+                obj.color = (0., 1., 0., .2)
+            elif global_id.string_value in diff['changed']:
+                obj.color = (0., 0., 1., .2)
+        return {'FINISHED'}
+
+
 class SelectDiffOldFile(bpy.types.Operator):
     bl_idname = "bim.select_diff_old_file"
     bl_label = "Select Diff Old File"

src/ifcblenderexport/blenderbim/bim/ui.py

@@ -1424,6 +1424,7 @@ class BIM_PT_diff(Panel):
         row = layout.row(align=True)
         row.prop(bim_properties, "diff_json_file")
         row.operator("bim.select_diff_json_file", icon="FILE_FOLDER", text="")
+        row.operator("bim.visualise_diff", icon="HIDE_OFF", text="")
 
         row = layout.row(align=True)
         row.prop(bim_properties, "diff_old_file")