Quantification to consider Pset_ProfileMechanical.MassPerLength #6344

src/bonsai/bonsai/bim/module/qto/calculator.py

@@ -24,6 +24,7 @@ import bonsai.tool as tool
 import ifcopenshell
 import ifcopenshell.geom
 import ifcopenshell.util.element
+import ifc5d.qto
 from mathutils import Vector, Matrix
 from mathutils.bvhtree import BVHTree
 from shapely.geometry import Polygon
@@ -565,7 +566,7 @@ def has_openings(obj: bpy.types.Object) -> list[ifcopenshell.entity_instance]:
     element = tool.Ifc.get_entity(obj)
     if not element:
         return []
-    return [o for o in tool.Geometry.get_openings(element)]
+    return [o for o in ifcopenshell.util.element.get_openings(element)]
 
 
 def get_obj_decompositions(obj: bpy.types.Object) -> set[ifcopenshell.entity_instance]:
@@ -576,20 +577,42 @@ def get_obj_decompositions(obj: bpy.types.Object) -> set[ifcopenshell.entity_ins
 
 
 def get_gross_weight(obj: bpy.types.Object) -> Union[float, None]:
-    """Get gross weight of the object (based on gross volume and Pset_MaterialCommon.MassDensity)"""
+    """Get gross weight of the object.
+
+    Based on gross volume and Pset_MaterialCommon.MassDensity
+    or Pset_ProfileMechanical.MassPerLength and extrusion depth if it's profile based.
+    """
+
+    weight = get_profile_obj_weight(obj)
+    if weight is not None:
+        return weight
+
     obj_mass_density = get_obj_mass_density(obj)
     if not obj_mass_density:
         return
+
     gross_volume = get_gross_volume(obj)
     gross_weight = obj_mass_density * gross_volume
     return gross_weight
 
 
 def get_net_weight(obj: bpy.types.Object) -> Union[float, None]:
-    """Get net weight of the object (based on net volume and Pset_MaterialCommon.MassDensity)"""
+    """Get net weight of the object.
+
+    Based on Pset_ProfileMechanical.MassPerLength and extrusion depth
+    (for profile based objects, though objects with openings are not supported)
+    or object's net volume and Pset_MaterialCommon.MassDensity.
+    """
+
+    if not has_openings(obj):
+        weight = get_profile_obj_weight(obj)
+        if weight is not None:
+            return weight
+
     obj_mass_density = get_obj_mass_density(obj)
     if not obj_mass_density:
         return
+
     net_volume = get_net_volume(obj)
     net_weight = obj_mass_density * net_volume
     return net_weight
@@ -602,6 +625,13 @@ def get_obj_mass_density(obj: bpy.types.Object) -> Union[float, None]:
     return ifcopenshell.util.element.get_element_mass_density(entity)
 
 
+def get_profile_obj_weight(obj: bpy.types.Object) -> Union[float, None]:
+    element = tool.Ifc.get_entity(obj)
+    assert element
+    weight = ifc5d.qto.IfcOpenShell.get_weight_profile_based(element)
+    return weight
+
+
 def get_opening_type(opening: bpy.types.Object, obj: bpy.types.Object) -> Literal["OPENING", "RECESS"]:
     """_summary_: Returns the opening type - OPENING / RECESS
 

src/bonsai/bonsai/tool/geometry.py

@@ -1660,15 +1660,13 @@ class Geometry(bonsai.core.tool.Geometry):
 
         Use `.RelatedOpeningElement` to get the opening element.
         """
-        for element_rel in getattr(element, "HasOpenings", ()):
-            yield element_rel
-
-        if aggregate := ifcopenshell.util.element.get_aggregate(element):
-            yield from cls.get_openings(aggregate)
+        # TODO: replace everywhere with util method.
+        return ifcopenshell.util.element.get_openings(element)
 
     @classmethod
     def has_openings(cls, element: ifcopenshell.entity_instance) -> bool:
-        return bool(next(cls.get_openings(element), False))
+        # TODO: replace everywhere with util method.
+        return ifcopenshell.util.element.has_openings(element)
 
     @classmethod
     def get_elements_by_representation(

src/ifc5d/ifc5d/qto.py

@@ -238,7 +238,9 @@ class IfcOpenShell(QtoCalculator):
         "get_weight": Function(
             "IfcMassMeasure",
             "Weight",
-            "The weight of the object based on it's volume and material density (from Pset_MaterialCommon.MassDensity).",
+            "The weight of the object based on it's length and Pset_ProfileMechanical.MassPerLength "
+            "(for profile based objects, though objects with openings are not supported for net calculations)"
+            "or it's volume and material density (from Pset_MaterialCommon.MassDensity).",
         ),
     }
 
@@ -308,7 +310,8 @@ class IfcOpenShell(QtoCalculator):
                                 if value is None:
                                     continue
                             elif formula == "get_weight":
-                                value = cls.get_weight(element, geometry)
+                                calculation_type = "GROSS" if iterator.settings is cls.gross_settings else "NET"
+                                value = cls.get_weight(element, geometry, calculation_type)
                                 if value is None:
                                     continue
                             else:
@@ -367,7 +370,10 @@ class IfcOpenShell(QtoCalculator):
 
     @classmethod
     def get_weight(
-        cls, element: ifcopenshell.entity_instance, geometry: ifcopenshell.geom.ShapeType
+        cls,
+        element: ifcopenshell.entity_instance,
+        geometry: ifcopenshell.geom.ShapeType,
+        calculation_type: Literal["GROSS", "NET"],
     ) -> Union[float, None]:
         """Get element's weight.
 
@@ -376,12 +382,44 @@ class IfcOpenShell(QtoCalculator):
             or ``None`` if mass density calculation for this element is not supported.
         """
 
+        if calculation_type == "gross" or not ifcopenshell.util.element.has_openings(element):
+            weight = cls.get_weight_profile_based(element)
+            if weight is not None:
+                return weight
+
         density = ifcopenshell.util.element.get_element_mass_density(element)
         if density is None:
             return
         volume = ifcopenshell.util.shape.get_volume(geometry)
         return volume * density
 
+    @classmethod
+    def get_weight_profile_based(cls, element: ifcopenshell.entity_instance) -> Union[float, None]:
+        """Get weight of the profile based element.
+
+        :return: A float weight value if calculation was successful
+            or ``None`` if it's either not profile based object
+            or it's not supported.
+        """
+        representation = ifcopenshell.util.representation.get_representation(element, "Model", "Body", "MODEL_VIEW")
+        if not representation:
+            return None
+        items = representation.Items
+        if not all(item.is_a("IfcExtrudedAreaSolid") for item in items):
+            return None
+        mass = 0.0
+        for item in items:
+            profile = item.SweptArea
+            # TODO: there are also bunch of other similar props we will need to consider in the future.
+            # Examples:
+            # - Pset_CableSegmentTypeBusBarSegment.MassPerLength
+            # - Pset_CableCarrierSegmentTypeCatenaryWire.MassPerLength
+            mass_per_length = ifcopenshell.util.element.get_pset(profile, "Pset_ProfileMechanical", "MassPerLength")
+            if not isinstance(mass_per_length, float):
+                return None
+            mass += mass_per_length * item.Depth
+        return mass
+
 
 class Blender(QtoCalculator):
     """Calculates geometry based on currently loaded Blender objects."""

src/ifcopenshell-python/ifcopenshell/util/element.py

@@ -20,7 +20,7 @@ import ifcopenshell
 import ifcopenshell.guid
 import ifcopenshell.util.element
 import ifcopenshell.util.representation
-from typing import Any, Callable, Optional, Union, Literal, overload, Sequence
+from typing import Any, Callable, Optional, Union, Literal, overload, Sequence, Generator
 from collections import namedtuple
 
 
@@ -1720,3 +1720,27 @@ def has_property(product: ifcopenshell.entity_instance, property_name: str) -> b
         return True
     qtos = get_psets(product, qtos_only=True)
     return any(property_name in quantities.keys() for quantities in qtos.values())
+
+
+def get_openings(element: ifcopenshell.entity_instance) -> Generator[ifcopenshell.entity_instance, None, None]:
+    """Get element openings as IfcRelVoidsElements.
+
+    Use `.RelatedOpeningElement` to get the opening element.
+
+    :param element: IfcElement.
+    :return: Generator of IfcRelVoidsElements.
+    """
+    for element_rel in getattr(element, "HasOpenings", ()):
+        yield element_rel
+
+    if aggregate := get_aggregate(element):
+        yield from get_openings(aggregate)
+
+
+def has_openings(element: ifcopenshell.entity_instance) -> bool:
+    """Check if the element has openings.
+
+    :param element: IfcElement.
+    :return: True if element has openings.
+    """
+    return bool(next(get_openings(element), False))