Add ability to map representations. See #1222.

src/ifcblenderexport/blenderbim/bim/module/geometry/__init__.py

@@ -4,6 +4,7 @@ from . import ui, prop, operator
 classes = (
     operator.EditObjectPlacement,
     operator.AddRepresentation,
+    operator.MapRepresentation,
     operator.SwitchRepresentation,
     operator.RemoveRepresentation,
     operator.UpdateMeshRepresentation,

src/ifcblenderexport/blenderbim/bim/module/geometry/map_representation.py

@@ -0,0 +1,42 @@
+class Usecase:
+    def __init__(self, file, settings=None):
+        self.file = file
+        self.settings = {
+            "product": None,
+            "representation": None,
+        }
+        self.ifc_vertices = []
+        for key, value in settings.items():
+            self.settings[key] = value
+
+    def execute(self):
+        self.get_mapping_source()
+
+        self.zero = self.file.createIfcCartesianPoint((0.0, 0.0, 0.0))
+        self.x_axis = self.file.createIfcDirection((1.0, 0.0, 0.0))
+        self.y_axis = self.file.createIfcDirection((0.0, 1.0, 0.0))
+        self.z_axis = self.file.createIfcDirection((0.0, 0.0, 1.0))
+        mapping_target = self.file.createIfcCartesianTransformationOperator3D(
+            self.x_axis, self.y_axis, self.zero, 1, self.z_axis
+        )
+        mapped_item = self.file.createIfcMappedItem(self.get_mapping_source(), mapping_target)
+        return self.file.create_entity(
+            "IfcShapeRepresentation",
+            **{
+                "ContextOfItems": self.settings["representation"].ContextOfItems,
+                "RepresentationIdentifier": self.settings["representation"].RepresentationIdentifier,
+                "RepresentationType": "MappedRepresentation",
+                "Items": [mapped_item],
+            }
+        )
+
+    def get_mapping_source(self):
+        if self.settings["representation"].RepresentationMap:
+            return self.settings["representation"].RepresentationMap[0]
+        return self.file.create_entity(
+            "IfcRepresentationMap",
+            **{
+                "MappingOrigin": self.file.createIfcAxis2Placement3D(zero, z_axis, x_axis),
+                "MappedRepresentation": self.settings["representation"],
+            }
+        )

src/ifcblenderexport/blenderbim/bim/module/geometry/operator.py

@@ -4,6 +4,7 @@ import ifcopenshell
 import logging
 import blenderbim.bim.module.geometry.edit_object_placement as edit_object_placement
 import blenderbim.bim.module.geometry.add_representation as add_representation
+import blenderbim.bim.module.geometry.map_representation as map_representation
 import blenderbim.bim.module.geometry.assign_styles as assign_styles
 import blenderbim.bim.module.geometry.assign_representation as assign_representation
 import blenderbim.bim.module.geometry.remove_representation as remove_representation
@@ -174,6 +175,37 @@ class RemoveRepresentation(bpy.types.Operator):
         return {"FINISHED"}
 
 
+class MapRepresentation(bpy.types.Operator):
+    bl_idname = "bim.map_representation"
+    bl_label = "Map Representation"
+    obj: bpy.props.StringProperty()
+    target_obj: bpy.props.StringProperty()
+
+    def execute(self, context):
+        objs = [bpy.data.objects.get(self.obj)] if self.obj else bpy.context.selected_objects
+        target_obj = bpy.data.objects.get(self.obj) if self.obj else bpy.context.active_object
+        objs = [o for o in objs if o != target_obj]
+        self.file = IfcStore.get_file()
+
+        for obj in objs:
+            bpy.ops.bim.edit_object_placement(obj=obj.name)
+            product = self.file.by_id(obj.BIMObjectProperties.ifc_definition_id)
+            old_representation = self.file.by_id(obj.data.BIMMeshProperties.ifc_definition_id)
+            target_representation = self.file.by_id(target_obj.data.BIMMeshProperties.ifc_definition_id)
+            obj.data = target_obj.data
+            result = map_representation.Usecase(
+                self.file,
+                {
+                    "product": product,
+                    "representation": target_representation,
+                },
+            ).execute()
+            assign_representation.Usecase(self.file, {"product": product, "representation": result}).execute()
+            bpy.ops.bim.remove_representation(ifc_definition_id=old_representation.id())
+            Data.load(obj.BIMObjectProperties.ifc_definition_id)
+        return {"FINISHED"}
+
+
 class UpdateMeshRepresentation(bpy.types.Operator):
     bl_idname = "bim.update_mesh_representation"
     bl_label = "Update Mesh Representation"

src/ifcblenderexport/blenderbim/bim/module/geometry/remove_representation.py

@@ -14,4 +14,23 @@ class Usecase:
                 [self.file.remove(s) for s in subelement.StyledByItem]
             elif subelement.is_a("IfcRepresentation"):
                 subelement.ContextOfItems = dummy_context
+                self.purge_representation_inverses(subelement)
+        self.purge_representation_inverses(self.settings["representation"])
         ifcopenshell.util.element.remove_deep(self.file, self.settings["representation"])
+
+    def purge_representation_inverses(self, element):
+        for inverse in self.file.get_inverse(element):
+            if inverse.is_a("IfcPresentationLayerAssignment"):
+                assigned_items = set(inverse.AssignedItems)
+                if len(assigned_items) == 1:
+                    self.file.remove(inverse)
+                else:
+                    assigned_items.remove(element)
+                    inverse.AssignedItems == list(assigned_items)
+            elif inverse.is_a("IfcProductRepresentation"):
+                representations = set(inverse.Representations)
+                if len(representations) == 1:
+                    self.file.remove(inverse)
+                else:
+                    representations.remove(element)
+                    inverse.Representations = list(representations)

src/ifcblenderexport/blenderbim/bim/module/geometry/ui.py

@@ -68,6 +68,8 @@ class BIM_PT_mesh(Panel):
         row.operator("bim.get_representation_ifc_parameters")
         row = layout.row()
         row.operator("bim.update_mesh_representation")
+        row = layout.row()
+        row.operator("bim.map_representation")
         for index, ifc_parameter in enumerate(props.ifc_parameters):
             row = layout.row(align=True)
             row.prop(ifc_parameter, "name", text="")

src/ifcblenderexport/blenderbim/bim/module/model/pie.py

@@ -107,6 +107,7 @@ class VIEW3D_MT_PIE_bim(bpy.types.Menu):
         pie = self.layout.menu_pie()
         pie.operator("bim.edit_object_placement")
         pie.operator("bim.update_mesh_representation")
+        pie.operator("bim.map_representation")
         pie.operator("bim.pie_add_opening")
         pie.operator("bim.pie_update_container")
         pie.operator("bim.open_pie_class", text="Assign IFC Class")