New feature to switch / load / create new contexts per object

src/ifcblenderexport/blenderbim/bim/__init__.py

@@ -97,6 +97,7 @@ if bpy is not None:
         operator.ActivateView,
         operator.ExecuteIfcDiff,
         operator.AssignContext,
+        operator.SwitchContext,
         operator.SetViewPreset1,
         operator.SetViewPreset2,
         operator.OpenUpstream,

src/ifcblenderexport/blenderbim/bim/ifc.py

@@ -1,5 +1,15 @@
+import bpy
+import ifcopenshell
+
 class IfcStore():
     path = ''
     file = None
     pset_template_path = ''
     pset_template_file = None
+
+    @staticmethod
+    def get_file():
+        if IfcStore.file is None:
+            IfcStore.path = bpy.context.scene.BIMProperties.ifc_file
+            IfcStore.file = ifcopenshell.open(IfcStore.path)
+        return IfcStore.file

src/ifcblenderexport/blenderbim/bim/operator.py

@@ -1203,11 +1203,7 @@ class ValidateIfcFile(bpy.types.Operator):
         import ifcopenshell.validate
         logger = logging.getLogger('validate')
         logger.setLevel(logging.DEBUG)
-        if bpy.context.scene.BIMProperties.ifc_file \
-                and bpy.context.scene.BIMProperties.ifc_file != ifc.IfcStore.path:
-            ifc.IfcStore.file = ifcopenshell.open(bpy.context.scene.BIMProperties.ifc_file)
-            ifc.IfcStore.path = bpy.context.scene.BIMProperties.ifc_file
-        ifcopenshell.validate.validate(ifc.IfcStore.file, logger)
+        ifcopenshell.validate.validate(ifc.IfcStore.get_file(), logger)
         return {'FINISHED'}
 
 
@@ -1759,6 +1755,57 @@ class AssignContext(bpy.types.Operator):
             )
 
 
+class SwitchContext(bpy.types.Operator):
+    bl_idname = 'bim.switch_context'
+    bl_label = 'Switch Context'
+
+    # Warning: This is an incredibly experimental operator. It effectively does
+    # a mini-import. A better approach will make this obsolete in the future.
+    def execute(self, context):
+        self.obj = bpy.context.active_object
+
+        if '/' not in self.obj.data.name:
+            self.obj.data.name = 'Model/Body/MODEL_VIEW/' + self.obj.data.name
+
+        self.context = bpy.context.scene.BIMProperties.available_contexts
+        self.subcontext = bpy.context.scene.BIMProperties.available_subcontexts
+        self.target_view = bpy.context.scene.BIMProperties.available_target_views
+
+        global_id = self.obj.BIMObjectProperties.attributes.get('GlobalId').string_value
+
+        mesh = bpy.data.meshes.get('{}/{}/{}/{}'.format(
+            self.context, self.subcontext, self.target_view, self.obj.data.name.split('/')[3]))
+        if not mesh:
+            try:
+                mesh = self.pull_mesh_from_ifc(global_id)
+            except:
+                mesh = bpy.data.meshes.new('{}/{}/{}/{}'.format(
+                    self.context, self.subcontext, self.target_view, self.obj.data.name.split('/')[3]))
+
+        self.obj.data = mesh
+        return {'FINISHED'}
+
+    def pull_mesh_from_ifc(self, global_id):
+        self.file = ifc.IfcStore.get_file()
+        logger = logging.getLogger('ImportIFC')
+        ifc_import_settings = import_ifc.IfcImportSettings.factory(bpy.context, ifc.IfcStore.path, logger)
+        element = self.file.by_id(global_id)
+        settings = ifcopenshell.geom.settings()
+        settings.set(settings.INCLUDE_CURVES, True)
+        rep = [r for r in element.Representation.Representations if
+                r.ContextOfItems.ContextType == self.context \
+                and r.ContextOfItems.ContextIdentifier == self.subcontext \
+                and r.ContextOfItems.TargetView == self.target_view][0]
+        shape = ifcopenshell.geom.create_shape(settings, rep)
+        ifc_importer = import_ifc.IfcImporter(ifc_import_settings)
+        mesh = ifc_importer.create_mesh(element, shape)
+        mesh.name = '{}/{}/{}/{}'.format(
+            self.context, self.subcontext, self.target_view, self.obj.data.name.split('/')[3])
+        material_creator = import_ifc.MaterialCreator(ifc_import_settings)
+        material_creator.create(element, self.obj, mesh)
+        return mesh
+
+
 class SetViewPreset1(bpy.types.Operator):
     bl_idname = 'bim.set_view_preset_1'
     bl_label = 'Set View Preset 1'

src/ifcblenderexport/blenderbim/bim/ui.py

@@ -367,7 +367,9 @@ class BIM_PT_mesh(Panel):
         row.prop(bpy.context.scene.BIMProperties, 'available_contexts', text='')
         row.prop(bpy.context.scene.BIMProperties, 'available_subcontexts', text='')
         row.prop(bpy.context.scene.BIMProperties, 'available_target_views', text='')
-        row = layout.row()
+
+        row = layout.row(align=True)
+        row.operator('bim.switch_context')
         row.operator('bim.assign_context')
 
         row = layout.row()