Add direction sense and offset support for slabs

src/bonsai/bonsai/bim/module/model/handler.py

@@ -58,6 +58,11 @@ def load_post(*args):
     ifcopenshell.api.add_post_listener(
         "material.edit_layer", "Bonsai.DumbSlab.RegenerateFromLayer", slab.DumbSlabPlaner().regenerate_from_layer
     )
+    ifcopenshell.api.add_post_listener(
+        "material.edit_layer_usage",
+        "Bonsai.DumbSlab.RegenerateFromLayerSetUsage",
+        slab.DumbSlabPlaner().regenerate_from_layer_set_usage,
+    )
     ifcopenshell.api.add_post_listener(
         "type.assign_type", "Bonsai.DumbSlab.RegenerateFromType", slab.DumbSlabPlaner().regenerate_from_type
     )

src/bonsai/bonsai/bim/module/model/slab.py

@@ -131,9 +131,9 @@ class DumbSlabGenerator:
         matrix_world = Matrix()
         matrix_world.translation = self.location
         if self.container_obj:
-            matrix_world.translation.z = self.container_obj.location.z - self.depth
+            matrix_world.translation.z = self.container_obj.location.z
         else:
-            matrix_world.translation.z -= self.depth
+            matrix_world.translation.z
         obj.matrix_world = Matrix.Rotation(self.x_angle, 4, "X") @ matrix_world
         bpy.context.view_layer.update()
 
@@ -195,6 +195,26 @@ class DumbSlabGenerator:
 
 
 class DumbSlabPlaner:
+    def regenerate_from_layer_set_usage(self, usecase_path, ifc_file, settings):
+        self.unit_scale = ifcopenshell.util.unit.calculate_unit_scale(ifc_file)
+        obj = bpy.context.active_object
+        element = tool.Ifc.get_entity(obj)
+
+        if tool.Model.get_usage_type(element) != "LAYER3":
+            return
+
+        # Called from materil.add_layer or material.remove_layer
+        material = ifcopenshell.util.element.get_material(element)
+        material_set_usage = tool.Ifc.get().by_id(material.id())
+        layer_set = material_set_usage.ForLayerSet
+
+        total_thickness = sum([l.LayerThickness for l in layer_set.MaterialLayers])
+        if not total_thickness:
+            return
+
+        self.change_thickness(element, total_thickness)
+
+
     def regenerate_from_layer(self, usecase_path, ifc_file, settings):
         self.unit_scale = ifcopenshell.util.unit.calculate_unit_scale(ifc_file)
 
@@ -267,20 +287,38 @@ class DumbSlabPlaner:
             self.change_thickness(related_object, new_thickness)
 
     def change_thickness(self, element: ifcopenshell.entity_instance, thickness: float) -> None:
+        layer_params = tool.Model.get_material_layer_parameters(element)
         body_context = ifcopenshell.util.representation.get_context(tool.Ifc.get(), "Model", "Body", "MODEL_VIEW")
         obj = tool.Ifc.get_object(element)
         if not obj:
             return
 
-        delta_thickness = (thickness * self.unit_scale) - obj.dimensions.z
+        if thickness == 0:
-        if round(delta_thickness, 2) == 0:
             return
 
         representation = ifcopenshell.util.representation.get_representation(element, "Model", "Body", "MODEL_VIEW")
         if representation:
             extrusion = tool.Model.get_extrusion(representation)
             if extrusion:
+                x, y, z = extrusion.ExtrudedDirection.DirectionRatios
+                offset = layer_params["offset"]
+                offset_vector = Vector((0.0, 0.0, offset / self.unit_scale))
+                if layer_params["direction_sense"] == "POSITIVE":
+                    y = abs(y)
+                    z = abs(z)
+                if layer_params["direction_sense"] == "NEGATIVE":
+                    y = -abs(y)
+                    z = -abs(z)
+                    offset_vector = -offset_vector 
+                extrusion.ExtrudedDirection.DirectionRatios = (x, y, z)
                 extrusion.Depth = thickness
+
+                if offset != 0.0 and not extrusion.Position:
+                    tool.Model.add_extrusion_position(extrusion, offset)
+                if extrusion.Position:
+                    extrusion.Position.Location.Coordinates = tuple(offset_vector)
+
+
             else:
                 props = bpy.context.scene.BIMModelProperties
                 x_angle = 0 if tool.Cad.is_x(props.x_angle, 0, tolerance=0.001) else props.x_angle
@@ -330,8 +368,6 @@ class DumbSlabPlaner:
             should_sync_changes_first=False,
         )
 
-        obj.location[2] -= delta_thickness
-
 
 class EnableEditingSketchExtrusionProfile(bpy.types.Operator, tool.Ifc.Operator):
     bl_idname = "bim.enable_editing_sketch_extrusion_profile"

src/bonsai/bonsai/tool/model.py

@@ -2044,3 +2044,16 @@ class Model(bonsai.core.tool.Model):
     @classmethod
     def add_filled_opening(cls, voided_obj: bpy.types.Object, filling_obj: bpy.types.Object) -> None:
         FilledOpeningGenerator().generate(filling_obj, voided_obj)
+
+    @classmethod
+    def add_extrusion_position(cls, extrusion: ifcopenshell.entity_instance, offset: float) -> None:
+        ifc_file = tool.Ifc.get()
+
+        position = ifc_file.createIfcAxis2Placement3D(
+            ifc_file.createIfcCartesianPoint((0.0, 0.0, offset)),
+            ifc_file.createIfcDirection((0.0, 0.0, 1.0)),
+            ifc_file.createIfcDirection((1.0, 0.0, 0.0)),
+        )
+
+        extrusion.Position = position
+

src/ifcopenshell-python/ifcopenshell/api/geometry/add_slab_representation.py

@@ -27,6 +27,8 @@ def add_slab_representation(
     file: ifcopenshell.file,
     context: ifcopenshell.entity_instance,
     depth: float = 0.2,
+    direction_sense: str = "POSITIVE",
+    offset: float = 0.0,
     x_angle: float = 0.0,
     clippings: Optional[list[Union[Clipping, dict[str, Any]]]] = None,
     polyline: Optional[list[tuple[float, float]]] = None,
@@ -56,6 +58,8 @@ def add_slab_representation(
     usecase.settings = {
         "context": context,
         "depth": depth,
+        "direction_sense": direction_sense,
+        "offset": offset,
         "x_angle": x_angle,
         "clippings": clippings if clippings is not None else [],
         "polyline": polyline,
@@ -80,7 +84,7 @@ class Usecase:
         size = self.convert_si_to_unit(1)
         points = ((0.0, 0.0), (size, 0.0), (size, size), (0.0, size), (0.0, 0.0))
         if self.settings["polyline"]:
-            points = [(self.convert_si_to_unit(p[0]), self.convert_si_to_unit(p[1])) for p in self.settings["polyline"]]
+            points = [(self.convert_si_to_unit(p[0]), self.convert_si_to_unit(p[1] * (1 / cos(self.settings["x_angle"])))) for p in self.settings["polyline"]]
         if self.file.schema == "IFC2X3":
             curve = self.file.createIfcPolyline([self.file.createIfcCartesianPoint(p) for p in points])
         else:
@@ -94,9 +98,9 @@ class Usecase:
 
         position = None
         # default position for IFC2X3 where .Position is not optional
-        if self.file.schema == "IFC2X3":
+        if self.file.schema == "IFC2X3" or self.settings["offset"] != 0:
             position = self.file.createIfcAxis2Placement3D(
-                self.file.createIfcCartesianPoint((0.0, 0.0, 0.0)),
+                self.file.createIfcCartesianPoint((0.0, 0.0, self.convert_si_to_unit(self.settings["offset"]))),
                 self.file.createIfcDirection((0.0, 0.0, 1.0)),
                 self.file.createIfcDirection((1.0, 0.0, 0.0)),
             )