You can now split objects using a drawn edge, especially useful when creating slab pour breaks and fixing lazily modeled walls and columns. Thanks Gorgious56!

src/blenderbim/Makefile

@@ -243,11 +243,12 @@ endif
 	# Required by IFC4D
 	mkdir dist/working
 	cd dist/working && wget https://files.pythonhosted.org/packages/b0/bb/9c4dddd3ca173cb56241cfb2eddfae24690dc676d357ac4cab17d0a36d9d/PyP6Xer-1.13.0.tar.gz
-	cd dist/working && tar -xzvf xerparser*
-	cp -r dist/working/xerparser-1.13.0/xerparser dist/blenderbim/libs/site/packages/
+	cd dist/working && tar -xzvf PyP6Xer*
+	cp -r dist/working/PyP6Xer-1.13.0/xerparser dist/blenderbim/libs/site/packages/
 	rm -rf dist/working
 
 	# Required by xerparser and IFC4D
+	# TODO: remove this dependency. It's only used to show a progress bar.
 	mkdir dist/working
 	cd dist/working && wget https://files.pythonhosted.org/packages/9f/7b/76c4e5ef1a1b528fcaada4133f972e77d33c252831676cf414119ca6093d/tqdm-4.50.0.tar.gz
 	cd dist/working && tar -xzvf tqdm*

src/blenderbim/blenderbim/bim/module/misc/__init__.py

@@ -24,6 +24,7 @@ classes = (
     operator.SetOverrideColour,
     operator.SetViewportShadowFromSun,
     operator.SnapSpacesTogether,
+    operator.SplitAlongEdge,
     prop.BIMMiscProperties,
     ui.BIM_PT_misc_utilities,
 )

src/blenderbim/blenderbim/bim/module/misc/operator.py

@@ -120,8 +120,21 @@ class ResizeToStorey(bpy.types.Operator, Operator):
 
     @classmethod
     def poll(cls, context):
-        return context.selected_objects
+        return context.selected_objects and tool.Ifc.get()
 
     def _execute(self, context):
         for obj in context.selected_objects:
             core.resize_to_storey(tool.Misc, obj=obj)
+
+
+class SplitAlongEdge(bpy.types.Operator, Operator):
+    bl_idname = "bim.split_along_edge"
+    bl_label = "Split Along Edge"
+    bl_options = {"REGISTER", "UNDO"}
+
+    @classmethod
+    def poll(cls, context):
+        return context.selected_objects and tool.Ifc.get()
+
+    def _execute(self, context):
+        core.split_along_edge(tool.Misc, cutter=context.active_object, objs=context.selected_objects)

src/blenderbim/blenderbim/bim/module/misc/ui.py

@@ -40,3 +40,5 @@ class BIM_PT_misc_utilities(bpy.types.Panel):
         row.operator("bim.snap_spaces_together")
         row = layout.row()
         row.operator("bim.resize_to_storey")
+        row = layout.row()
+        row.operator("bim.split_along_edge")

src/blenderbim/blenderbim/bim/module/model/ui.py

@@ -42,7 +42,7 @@ class BIM_PT_authoring(Panel):
         else:
             col.label(text="No IFC Class", icon="FILE_VOLUME")
             enabled = False
-        if type_prop.getAvailableTypes(tprops, context):
+        if type_prop.get_relating_type(tprops, context):
             col.prop(tprops, "relating_type", text="", icon="FILE_3D")
         else:
             col.label(text="No Relating Type", icon="FILE_3D")

src/blenderbim/blenderbim/core/misc.py

@@ -28,3 +28,11 @@ def resize_to_storey(misc, obj=None):
     misc.move_object_to_elevation(obj, misc.get_storey_elevation_in_si(storey))
     misc.scale_object_to_height(obj, height)
     misc.mark_object_as_edited(obj)
+
+
+def split_along_edge(misc, cutter=None, objs=None):
+    new_objs = misc.split_objects_with_cutter(objs, cutter)
+    for obj in new_objs:
+        misc.run_root_copy_class(obj=obj)
+    for obj in objs:
+        misc.mark_object_as_edited(obj)

src/blenderbim/blenderbim/core/tool.py

@@ -104,8 +104,10 @@ class Misc:
     def get_storey_height_in_si(cls, storey): pass
     def mark_object_as_edited(cls, obj): pass
     def move_object_to_elevation(cls, obj, elevation): pass
+    def run_root_copy_class(cls, obj=None): pass
     def scale_object_to_height(cls, obj, height): pass
     def set_object_origin_to_bottom(cls, obj): pass
+    def split_objects_with_cutter(cls, objs, cutter): pass
 
 
 @interface

src/blenderbim/blenderbim/tool/misc.py

@@ -17,8 +17,10 @@
 # along with BlenderBIM Add-on.  If not, see <http://www.gnu.org/licenses/>.
 
 import bpy
+import bmesh
 import ifcopenshell
 import blenderbim.core.tool
+import blenderbim.core.root
 import blenderbim.tool as tool
 from mathutils import Vector, Matrix
 from blenderbim.bim.ifc import IfcStore
@@ -76,6 +78,10 @@ class Misc(blenderbim.core.tool.Misc):
     def move_object_to_elevation(cls, obj, elevation):
         obj.matrix_world.translation[2] = elevation
 
+    @classmethod
+    def run_root_copy_class(cls, obj=None):
+        return blenderbim.core.root.copy_class(tool.Ifc, tool.Collector, tool.Geometry, tool.Root, obj=obj)
+
     @classmethod
     def scale_object_to_height(cls, obj, height):
         absolute_bound_box = [obj.matrix_world @ Vector(c) for c in obj.bound_box]
@@ -91,3 +97,38 @@ class Misc(blenderbim.core.tool.Misc):
     @classmethod
     def mark_object_as_edited(cls, obj):
         IfcStore.edited_objs.add(obj)
+
+    @classmethod
+    def split_objects_with_cutter(cls, objs, cutter):
+        cutter_mesh = cutter.data
+
+        bm = bmesh.new()
+        bm.from_mesh(cutter_mesh)
+        bm_flipped = bm.copy()
+        for f in bm_flipped.faces:
+            f.normal_flip()
+
+        new_objs = []
+        for obj in objs:
+            if obj.type != "MESH" or obj == cutter:
+                continue
+            new_obj = obj.copy()
+            new_obj.data = obj.data.copy()
+
+            obj.users_collection[0].objects.link(new_obj)
+
+            mod = new_obj.modifiers.new(type="BOOLEAN", name="Boolean")
+            mod.object = cutter
+            bpy.ops.object.modifier_apply({"object": new_obj}, modifier="Boolean")
+
+            bm_flipped.to_mesh(cutter_mesh)
+
+            mod = obj.modifiers.new(type="BOOLEAN", name="Boolean")
+            mod.object = cutter
+            bpy.ops.object.modifier_apply({"object": obj}, modifier="Boolean")
+
+            new_objs.append(new_obj)
+
+        bm.to_mesh(cutter_mesh)
+        bm.free()
+        return new_objs

src/blenderbim/test/bim/feature/misc.feature

@@ -35,3 +35,16 @@ Scenario: Resize to storey
     And I press "bim.assign_container(structure={storey})"
     When I press "bim.resize_to_storey"
     Then nothing happens
+
+Scenario: Split along edge
+    Given an empty IFC project
+    And I add a cube
+    And the object "Cube" is selected
+    And I set "scene.BIMRootProperties.ifc_class" to "IfcWall"
+    And I press "bim.assign_class"
+    And I add a plane of size "4" at "0,0,0"
+    And the object "IfcWall/Cube" is selected
+    And additionally the object "Plane" is selected
+    When I press "bim.split_along_edge"
+    Then the object "IfcWall/Cube" is an "IfcWall"
+    And the object "IfcWall/Cube.001" is an "IfcWall"

src/blenderbim/test/bim/test_feature.py

@@ -105,6 +105,12 @@ def i_add_a_cube_of_size_size_at_location(size, location):
     bpy.ops.mesh.primitive_cube_add(size=float(size), location=[float(co) for co in location.split(",")])
 
 
+@given(parsers.parse('I add a plane of size "{size}" at "{location}"'))
+@when(parsers.parse('I add a plane of size "{size}" at "{location}"'))
+def i_add_a_plane_of_size_size_at_location(size, location):
+    bpy.ops.mesh.primitive_plane_add(size=float(size), location=[float(co) for co in location.split(",")])
+
+
 @given(parsers.parse('I press "{operator}"'))
 @when(parsers.parse('I press "{operator}"'))
 def i_press_operator(operator):

src/blenderbim/test/core/test_misc.py

@@ -39,3 +39,11 @@ class TestResizeToStorey:
         misc.get_object_storey("obj").should_be_called().will_return("storey")
         misc.get_storey_height_in_si("storey").should_be_called().will_return(None)
         subject.resize_to_storey(misc, obj="obj")
+
+
+class TestSplitAlongEdge:
+    def test_run(self, misc):
+        misc.split_objects_with_cutter(["obj"], "cutter").should_be_called().will_return(["new_obj"])
+        misc.run_root_copy_class(obj="new_obj").should_be_called()
+        misc.mark_object_as_edited("obj").should_be_called()
+        subject.split_along_edge(misc, cutter="cutter", objs=["obj"])

src/blenderbim/test/tool/test_misc.py

@@ -134,6 +134,11 @@ class TestMoveObjectToElevation(test.bim.bootstrap.NewFile):
         assert list(obj.matrix_world.translation) == [0.0, 0.0, 3.0]
 
 
+class TestRunRootCopyClass(test.bim.bootstrap.NewFile):
+    def test_nothing(self):
+        pass
+
+
 class TestScaleObjectToHeight(test.bim.bootstrap.NewFile):
     def test_run(self):
         bpy.ops.mesh.primitive_cube_add()
@@ -149,3 +154,16 @@ class TestMarkObjectAsEdited(test.bim.bootstrap.NewFile):
         obj = bpy.data.objects.new("Cube", None)
         subject.mark_object_as_edited(obj)
         assert obj in IfcStore.edited_objs
+
+
+class TestSplitObjectsWithCutter(test.bim.bootstrap.NewFile):
+    def test_run(self):
+        bpy.ops.mesh.primitive_cube_add()
+        bpy.ops.mesh.primitive_plane_add(size=4)
+        obj = bpy.data.objects.get("Cube")
+        cutter = bpy.data.objects.get("Plane")
+        assert obj.dimensions[2] == 2
+        new_objs = subject.split_objects_with_cutter([obj], cutter)
+        assert new_objs[0].name == "Cube.001"
+        assert obj.dimensions[2] == 1
+        assert new_objs[0].dimensions[2] == 1