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boundaries.py
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# coding: utf8
"""This module adapt IfcRelSpaceBoundary and create SIA specific bem boundaries in FreeCAD.
© All rights reserved.
ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE, Switzerland, Laboratory CNPA, 2019-2020
See the LICENSE.TXT file for more details.
Author : Cyril Waechter
"""
import itertools
import os
from collections import namedtuple
import typing
from typing import NamedTuple, Iterable, List, Optional, Dict
import ifcopenshell
import ifcopenshell.geom
import ifcopenshell.util.element
import ifcopenshell.util.unit
import FreeCAD
import FreeCADGui
import Part
from freecad.bem import materials
from freecad.bem.bem_xml import BEMxml
from freecad.bem.bem_logging import logger, LOG_STREAM
from freecad.bem.progress import Progress
from freecad.bem import utils
from freecad.bem.entities import (
RelSpaceBoundary,
BEMBoundary,
Element,
ElementType,
)
from freecad.bem.ifc_importer import IfcImporter, TOLERANCE
if typing.TYPE_CHECKING:
from freecad.bem.typing import (
SpaceFeature,
ContainerFeature,
) # pylint: disable=no-name-in-module, import-error
def processing_sia_boundaries(doc=FreeCAD.ActiveDocument) -> None:
"""Create SIA specific boundaries cf. https://www.sia.ch/fr/services/sia-norm/"""
Progress.set(30, "ProcessingSIABoundaries_Prepare", Progress.new_space_count(), 40)
for space in utils.get_elements_by_ifctype("IfcSpace", doc):
ensure_hosted_element_are(space, doc)
ensure_hosted_are_coplanar(space)
compute_space_area(space)
set_face_to_boundary_info(space)
merge_over_splitted_boundaries(space, doc)
handle_curtain_walls(space, doc)
find_closest_edges(space)
set_leso_type(space)
ensure_external_earth_is_set(space, doc)
Progress.set()
Progress.set(70, "ProcessingSIABoundaries_Create", Progress.new_space_count(), 20)
ensure_materials_layers_order(doc)
create_sia_boundaries(doc)
doc.recompute()
def reverse_layers(material):
material.MaterialLayers = material.MaterialLayers[::-1]
material.Thicknesses = material.Thicknesses[::-1]
def set_internal_to_external(element, material):
axis = utils.get_axis_by_name(element.Placement, material.LayerSetDirection)
if material.DirectionSense == "NEGATIVE":
axis = -axis
for boundary in element.ProvidesBoundaries:
# Check if already set
if boundary.InternalToExternal:
continue
# Flooring always from top to bottom (agreement not in IFC standards)
if boundary.CorrespondingBoundary and boundary.LesoType == "Ceiling":
continue
if boundary.LesoType == "Flooring":
if axis.z > 0:
reverse_layers(material)
boundary.InternalToExternal = 1
if boundary.CorrespondingBoundary:
boundary.CorrespondingBoundary.InternalToExternal = -1
# External always from interior to exterior (agreement not in IFC standards)
elif boundary.InternalOrExternalBoundary != "INTERNAL":
if axis.dot(boundary.Normal) < 0:
reverse_layers(material)
boundary.InternalToExternal = 1
# Other internal boundaries
else:
if axis.dot(boundary.Normal) < 0:
boundary.InternalToExternal = -1
else:
boundary.InternalToExternal = 1
if boundary.CorrespondingBoundary:
boundary.CorrespondingBoundary.InternalToExternal = (
-boundary.InternalToExternal
)
def ensure_materials_layers_order(doc):
"""
There is no convention for material order in IFC but energy simulation software expect one.
From interior to exterior for external shell.
From top to bottom for internal slabs (flooring)
"""
for material in utils.get_by_class(doc, materials.LayerSet):
boundaries = []
for element in material.AssociatedTo:
try:
set_internal_to_external(element, material)
# Happen when element is an element type
except AttributeError:
for occurence in element.ApplicableOccurrence:
if not element.Material:
set_internal_to_external(occurence, material)
def ensure_external_earth_is_set(space: "SpaceFeature", doc=FreeCAD.ActiveDocument):
sites: List["ContainerFeature"] = list(
utils.get_elements_by_ifctype("IfcSite", doc)
)
ground_bound_box = get_ground_bound_box(sites)
if space.Shape.BoundBox.ZMin - ground_bound_box.ZMax > 1000:
return
ground_shape = Part.Compound([])
for site in sites:
ground_shape.add(site.Shape)
if not ground_shape.BoundBox.isValid():
ground_shape = Part.Plane().toShape()
for boundary in space.SecondLevel.Group:
if boundary.InternalOrExternalBoundary in (
"INTERNAL",
"EXTERNAL_EARTH",
"EXTERNAL_WATER",
"EXTERNAL_FIRE",
):
continue
if boundary.InnerBoundaries:
continue
if not is_underground(boundary, ground_shape):
continue
boundary.InternalOrExternalBoundary = "EXTERNAL_EARTH"
def is_underground(boundary, ground_shape) -> bool:
closest_points = ground_shape.distToShape(boundary.Shape)[1][0]
direction: FreeCAD.Vector = closest_points[1] - closest_points[0]
if direction.z > 1000:
return False
if boundary.LesoType == "Flooring":
el_thickness = getattr(
getattr(getattr(boundary, "RelatedBuildingElement", 0), "Thickness", 0),
"Value",
0,
)
if direction.z - el_thickness * 1.5 > 0:
return False
boundary.UndergroundDepth = abs(direction.z - el_thickness)
return True
if boundary.LesoType == "Wall":
bbox = boundary.Shape.BoundBox
if (bbox.ZMax + bbox.ZMin) / 2 + direction.z < 0:
return True
if boundary.LesoType == "Ceiling":
if direction.z < TOLERANCE:
return True
return False
def get_ground_bound_box(sites: Iterable["ContainerFeature"]) -> FreeCAD.BoundBox:
boundbox = FreeCAD.BoundBox()
for site in sites:
boundbox.add(site.Shape.BoundBox)
return boundbox if boundbox.isValid() else FreeCAD.BoundBox(0, 0, -30000, 0, 0, 0)
class FaceToBoundary:
def __init__(self, boundary, face):
self.boundary = boundary
self.face = face
self.point_on_face = None
self.point_on_boundary = None
self.compute_shortest()
self.boundary_normal = utils.get_boundary_normal(
boundary, self.point_on_boundary
)
self.face_normal = utils.get_face_normal(face, self.point_on_face)
self.distance = self.vec_to_space.Length
@property
def vec_to_space(self):
return self.point_on_face - self.point_on_boundary
def compute_shortest(self):
boundary_face = self.boundary.Shape.Faces[0]
min_dist = self.face.distToShape(boundary_face)
self.point_on_face = min_dist[1][0][0]
self.point_on_boundary = min_dist[1][0][1]
@property
def is_valid(self):
# Not valid face if its normal and boundary normal do not point in same direction
return abs(self.boundary_normal.dot(self.face_normal)) > 1 - TOLERANCE
@property
def fixed_normal(self):
return (
self.boundary_normal
if self.face_normal.dot(self.boundary_normal) > 0
else -self.boundary_normal
)
@property
def translation_to_face(self):
return self.face_normal * self.face_normal.dot(self.vec_to_space)
def set_face_to_boundary_info(space):
faces = space.Shape.Faces
for boundary in space.SecondLevel.Group:
if boundary.IsHosted:
continue
candidates = (FaceToBoundary(boundary, face) for face in faces)
result = min(candidates, key=lambda x: x.distance if x.is_valid else 10000)
boundary.TranslationToSpace = result.translation_to_face
normal = result.fixed_normal
boundary.Normal = normal
for hosted in boundary.InnerBoundaries:
hosted.Normal = normal
def compute_space_area(space: Part.Feature):
"""Compute both gross and net area"""
z_min = space.Shape.BoundBox.ZMin
z_sre = z_min + 1000 # 1 m above ground. See SIA 380:2015 &3.2.3 p.26-27
sre_plane = Part.Plane(FreeCAD.Vector(0, 0, z_sre), FreeCAD.Vector(0, 0, 1))
space.Area = space.Shape.common(sre_plane.toShape()).Area
# TODO: Not valid yet as it return net area. Find a way to get gross space volume
space.AreaAE = space.Area
def handle_curtain_walls(space, doc) -> None:
"""Add an hosted window with full area in curtain wall boundaries as they are not handled
by BEM softwares"""
for boundary in space.SecondLevel.Group:
if getattr(boundary.RelatedBuildingElement, "IfcType", "") != "IfcCurtainWall":
continue
# Prevent Revit issue which produce curtain wall with an hole inside but no inner boundary
if not boundary.InnerBoundaries:
if len(boundary.Shape.SubShapes) > 2:
outer_wire = boundary.Shape.SubShapes[1]
utils.generate_boundary_compound(boundary, outer_wire, ())
boundary.LesoType = "Wall"
fake_window = doc.copyObject(boundary)
fake_window.IsHosted = True
fake_window.LesoType = "Window"
fake_window.ParentBoundary = boundary
fake_window.GlobalId = ifcopenshell.guid.new()
fake_window.Id = IfcId.new(doc)
RelSpaceBoundary.set_label(fake_window)
space.SecondLevel.addObject(fake_window)
# Host cannot be an empty face so inner wire is scaled down a little
inner_wire = utils.get_outer_wire(boundary).scale(0.999)
inner_wire = utils.project_wire_to_plane(inner_wire, utils.get_plane(boundary))
utils.append_inner_wire(boundary, inner_wire)
utils.append(boundary, "InnerBoundaries", fake_window)
if FreeCAD.GuiUp:
fake_window.ViewObject.ShapeColor = (0.0, 0.7, 1.0)
class IfcId:
"""Generate new id for generated boundaries missing from ifc and keep track of last id used"""
current_id = 0
@classmethod
def new(cls, doc) -> int:
if not cls.current_id:
cls.current_id = max((getattr(obj, "Id", 0) for obj in doc.Objects))
cls.current_id += 1
return cls.current_id
def write_xml(doc=FreeCAD.ActiveDocument) -> BEMxml:
"""Read BEM infos for FreeCAD file and write it to an xml.
xml is stored in an object to allow different outputs"""
bem_xml = BEMxml()
for project in utils.get_elements_by_ifctype("IfcProject", doc):
bem_xml.write_project(project)
for zone in utils.get_elements_by_ifctype("IfcZone", doc):
bem_xml.write_zone(zone)
for space in utils.get_elements_by_ifctype("IfcSpace", doc):
bem_xml.write_space(space)
for boundary in space.SecondLevel.Group:
bem_xml.write_boundary(boundary)
for building_element_type in utils.get_by_class(doc, ElementType):
bem_xml.write_building_element_types(building_element_type)
for building_element in utils.get_by_class(doc, Element):
bem_xml.write_building_elements(building_element)
for material in utils.get_by_class(
doc,
(
materials.Material,
materials.ConstituentSet,
materials.LayerSet,
materials.ProfileSet,
),
):
bem_xml.write_material(material)
return bem_xml
def output_xml_to_path(bem_xml, xml_path=None):
if not xml_path:
xml_path = (
"./output.xml" if os.name == "nt" else "/home/cyril/git/BIMxBEM/output.xml"
)
bem_xml.write_to_file(xml_path)
def group_by_shared_element(boundaries) -> Dict[str, List["boundary"]]:
elements_dict = dict()
for rel_boundary in boundaries:
try:
key = f"{rel_boundary.RelatedBuildingElement.Id}_{rel_boundary.InternalOrExternalBoundary}"
except AttributeError:
if rel_boundary.PhysicalOrVirtualBoundary == "VIRTUAL":
logger.info("IfcElement %s is VIRTUAL. Modeling error ?")
key = "VIRTUAL"
else:
logger.warning(
"IfcElement %s has no RelatedBuildingElement", rel_boundary.Id
)
corresponding_boundary = rel_boundary.CorrespondingBoundary
if corresponding_boundary:
key += str(corresponding_boundary.Id)
elements_dict.setdefault(key, []).append(rel_boundary)
return elements_dict
def group_coplanar_boundaries(boundary_list) -> List[List["boundary"]]:
coplanar_boundaries = list()
for boundary in boundary_list:
if not coplanar_boundaries:
coplanar_boundaries.append([boundary])
continue
for coplanar_list in coplanar_boundaries:
if utils.is_coplanar(boundary, coplanar_list[0]):
coplanar_list.append(boundary)
break
else:
coplanar_boundaries.append([boundary])
return coplanar_boundaries
def merge_over_splitted_boundaries(space, doc=FreeCAD.ActiveDocument):
"""Try to merge oversplitted boundaries to reduce the number of boundaries and make sure that
windows are not splitted as it is often with some authoring softwares like Revit.
Why ? Less boundaries is more manageable, closer to what user expect and require
less computational power"""
boundaries = space.SecondLevel.Group
# Considered as the minimal size for an oversplit to occur (1 ceiling, 3 wall, 1 flooring)
if len(boundaries) <= 5:
return
elements_dict = group_by_shared_element(boundaries)
# Merge hosted elements first
for key, boundary_list in elements_dict.items():
if boundary_list[0].IsHosted and len(boundary_list) != 1:
coplanar_groups = group_coplanar_boundaries(boundary_list)
for group in coplanar_groups:
merge_coplanar_boundaries(group, doc)
for key, boundary_list in elements_dict.items():
# None coplanar boundaries should not be connected.
# eg. round wall splitted with multiple orientations.
# Case1: No oversplitted boundaries
try:
if boundary_list[0].IsHosted or len(boundary_list) == 1:
continue
except ReferenceError:
continue
coplanar_groups = group_coplanar_boundaries(boundary_list)
for group in coplanar_groups:
# Case 1 : only 1 boundary related to the same element. Cannot group boundaries.
if len(group) == 1:
continue
# Case 2 : more than 1 boundary related to the same element might be grouped.
try:
merge_coplanar_boundaries(group, doc)
except Part.OCCError:
logger.warning(
f"Cannot join boundaries in space <{space.Id}> with key <{key}>"
)
def merged_wires(wire1: Part.Wire, wire2: Part.Wire) -> (Part.Wire, List[Part.Wire]):
"""Try to merge 2 wires meant using face merging algorithm.
1. Transform wires into faces
2. Merge them
3. Return face outer wire and eventual inner wires"""
face1 = Part.Face(wire1)
face2 = Part.Face(wire2)
fusion = face1.fuse(face2)
fusion.sewShape()
unifier = Part.ShapeUpgrade.UnifySameDomain(fusion)
unifier.build()
if len(unifier.shape().SubShapes) == 1:
new_face = unifier.shape().SubShapes[0]
try:
return (new_face.OuterWire, new_face.Wires[1:])
except AttributeError: # Rarely returned shape is a Wire. OCCT bug ?
pass
return (None, [])
def merge_boundaries(boundary1, boundary2) -> bool:
"""Try to merge 2 boundaries. Retrun True if successfully merged"""
wire1 = utils.get_outer_wire(boundary1)
wire2 = utils.get_outer_wire(boundary2)
new_wire, extra_inner_wires = merged_wires(wire1, wire2)
if not new_wire:
return False
# Update shape
if boundary1.IsHosted:
utils.remove_inner_wire(boundary1.ParentBoundary, wire1)
utils.remove_inner_wire(boundary2.ParentBoundary, wire2)
utils.append_inner_wire(boundary1.ParentBoundary, new_wire)
else:
for inner_boundary in boundary2.InnerBoundaries:
utils.append(boundary1, "InnerBoundaries", inner_boundary)
inner_boundary.ParentBoundary = boundary1
inner_wires = utils.get_inner_wires(boundary1)[:]
inner_wires.extend(utils.get_inner_wires(boundary2))
inner_wires.extend(extra_inner_wires)
try:
utils.generate_boundary_compound(boundary1, new_wire, inner_wires)
except RuntimeError as error:
logger.exception(error)
return False
RelSpaceBoundary.recompute_areas(boundary1)
return True
def merge_corresponding_boundaries(boundary1, boundary2):
if boundary2.CorrespondingBoundary:
corresponding_boundary = max(
boundary1.CorrespondingBoundary,
boundary2.CorrespondingBoundary,
key=lambda x: x.Area,
)
boundary1.CorrespondingBoundary = corresponding_boundary
corresponding_boundary.CorrespondingBoundary = boundary1
def merge_coplanar_boundaries(boundaries: list, doc=FreeCAD.ActiveDocument):
"""Try to merge coplanar boundaries"""
if len(boundaries) == 1:
return
boundary1 = max(boundaries, key=lambda x: x.Area)
# Ensure all boundaries are coplanar
plane = utils.get_plane(boundary1)
for boundary in boundaries:
utils.project_boundary_onto_plane(boundary, plane)
boundaries.remove(boundary1)
remove_from_doc = list()
# Attempt to merge boundaries
while True and boundaries:
for boundary2 in boundaries:
if merge_boundaries(boundary1, boundary2):
merge_corresponding_boundaries(boundary1, boundary2)
boundaries.remove(boundary2)
remove_from_doc.append(boundary2)
break
else:
logger.warning(
f"""Unable to merge boundaries RelSpaceBoundary Id <{boundary1.Id}>
with boundaries <{", ".join(str(b.Id) for b in boundaries)}>"""
)
break
# Clean FreeCAD document if join operation was a success
for fc_object in remove_from_doc:
doc.removeObject(fc_object.Name)
def create_fake_host(boundary, space, doc):
fake_host = doc.copyObject(boundary)
fake_host.IsHosted = False
fake_host.LesoType = "Wall"
fake_host.GlobalId = ifcopenshell.guid.new()
fake_host.Id = IfcId.new(doc)
RelSpaceBoundary.set_label(fake_host)
space.SecondLevel.addObject(fake_host)
inner_wire = utils.get_outer_wire(boundary)
outer_wire = inner_wire.scaled(1.001, inner_wire.CenterOfMass)
plane = utils.get_plane(boundary)
outer_wire = utils.project_wire_to_plane(outer_wire, plane)
inner_wire = utils.project_wire_to_plane(inner_wire, plane)
utils.generate_boundary_compound(fake_host, outer_wire, [inner_wire])
boundary.ParentBoundary = fake_host
fake_building_element = doc.copyObject(boundary.RelatedBuildingElement)
fake_building_element.Id = IfcId.new(doc)
fake_host.RelatedBuildingElement = fake_building_element
utils.append(fake_host, "InnerBoundaries", boundary)
if FreeCAD.GuiUp:
fake_host.ViewObject.ShapeColor = (0.7, 0.3, 0.0)
return fake_host
def ensure_hosted_element_are(space, doc):
for boundary in space.SecondLevel.Group:
try:
ifc_type = boundary.RelatedBuildingElement.IfcType
except AttributeError:
continue
if not is_typically_hosted(ifc_type):
continue
if boundary.IsHosted and boundary.ParentBoundary:
continue
def valid_hosts(boundary):
"""Guess valid hosts"""
for boundary2 in space.SecondLevel.Group:
if boundary is boundary2 or is_typically_hosted(boundary2.IfcType):
continue
if not boundary2.Area.Value - boundary.Area.Value >= 0:
continue
if not utils.are_parallel_boundaries(boundary, boundary2):
continue
if utils.are_too_far(boundary, boundary2):
continue
yield boundary2
def find_host(boundary):
fallback_solution = None
for boundary2 in valid_hosts(boundary):
fallback_solution = boundary2
for inner_wire in utils.get_inner_wires(boundary2):
if (
not abs(Part.Face(inner_wire).Area - boundary.Area.Value)
< TOLERANCE
):
continue
return boundary2
if not fallback_solution:
raise HostNotFound(
f"No host found for RelSpaceBoundary Id<{boundary.Id}>"
)
logger.warning(
f"Using fallback solution to resolve host of RelSpaceBoundary Id<{boundary.Id}>"
)
return fallback_solution
try:
host = find_host(boundary)
except HostNotFound as err:
host = create_fake_host(boundary, space, doc)
logger.exception(err)
boundary.IsHosted = True
boundary.ParentBoundary = host
utils.append(host, "InnerBoundaries", boundary)
def ensure_hosted_are_coplanar(space):
for boundary in space.SecondLevel.Group:
inner_wires = utils.get_inner_wires(boundary)
missing_inner_wires = False
if len(inner_wires) < len(boundary.InnerBoundaries):
missing_inner_wires = True
outer_wire = utils.get_outer_wire(boundary)
for inner_boundary in boundary.InnerBoundaries:
if utils.is_coplanar(inner_boundary, boundary) and not missing_inner_wires:
continue
try:
utils.project_boundary_onto_plane(inner_boundary, utils.get_plane(boundary))
except Part.OCCError as err:
logger.exception(err)
logger.warning(f"Faile to project inner boundary {inner_boundary.Id} onto boundary {boundary.Id} plane")
inner_wire = utils.get_outer_wire(inner_boundary)
inner_wires.append(inner_wire)
try:
utils.generate_boundary_compound(boundary, outer_wire, inner_wires)
except RuntimeError:
continue
def is_typically_hosted(ifc_type: str):
"""Say if given ifc_type is typically hosted eg. windows, doors"""
usually_hosted_types = ("IfcWindow", "IfcDoor", "IfcOpeningElement")
for usual_type in usually_hosted_types:
if ifc_type.startswith(usual_type):
return True
return False
class HostNotFound(LookupError):
pass
Closest = namedtuple("Closest", ["boundary", "edge", "distance"])
def init_closest_default_values(boundaries):
for boundary in boundaries:
n_edges = len(utils.get_outer_wire(boundary).Edges)
boundary.Proxy.closest = [
Closest(boundary=None, edge=-1, distance=100000)
] * n_edges
def compare_closest_edges(boundary1, ei1, edge1, boundary2, ei2, edge2):
distance = boundary1.Proxy.closest[ei1].distance
edge_to_edge = edge_distance_to_edge(edge1, edge2)
if distance <= TOLERANCE:
return
elif edge_to_edge <= TOLERANCE or edge_to_edge - distance - TOLERANCE <= 0:
boundary1.Proxy.closest[ei1] = Closest(boundary2, ei2, edge_to_edge)
def find_closest_by_distance(boundary1, boundary2):
edges1 = utils.get_outer_wire(boundary1).Edges
edges2 = utils.get_outer_wire(boundary2).Edges
for (ei1, edge1), (ei2, edge2) in itertools.product(
enumerate(edges1), enumerate(edges2)
):
if not is_low_angle(edge1, edge2):
continue
compare_closest_edges(boundary1, ei1, edge1, boundary2, ei2, edge2)
compare_closest_edges( # pylint: disable=arguments-out-of-order
boundary2, ei2, edge2, boundary1, ei1, edge1
)
def find_closest_by_intersection(boundary1, boundary2):
intersect_line = utils.get_plane(boundary1).intersectSS(utils.get_plane(boundary2))[
0
]
boundaries_distance = boundary1.Shape.distToShape(boundary2.Shape)[0]
edges1 = utils.get_outer_wire(boundary1).Edges
edges2 = utils.get_outer_wire(boundary2).Edges
for (ei1, edge1), (ei2, edge2) in itertools.product(
enumerate(edges1), enumerate(edges2)
):
distance1 = edge_distance_to_line(edge1, intersect_line) + boundaries_distance
distance2 = edge_distance_to_line(edge2, intersect_line) + boundaries_distance
min_distance = boundary1.Proxy.closest[ei1].distance
if distance1 < min_distance:
boundary1.Proxy.closest[ei1] = Closest(boundary2, -1, distance1)
min_distance = boundary2.Proxy.closest[ei2].distance
if distance2 < min_distance:
boundary2.Proxy.closest[ei2] = Closest(boundary1, -1, distance2)
def find_closest_edges(space: "SpaceFeature") -> None:
"""Find closest boundary and edge to be able to reconstruct a closed shell"""
boundaries = [b for b in space.SecondLevel.Group if not b.IsHosted]
init_closest_default_values(boundaries)
# Loop through all boundaries and edges to find the closest edge
for boundary1, boundary2 in itertools.combinations(boundaries, 2):
# If boundary1 and boundary2 have opposite direction no match possible
normals_dot = boundary2.Normal.dot(boundary1.Normal)
if normals_dot <= -1 + TOLERANCE:
continue
# If boundaries are not almost parallel, they must intersect
if not normals_dot >= 1 - TOLERANCE:
find_closest_by_intersection(boundary1, boundary2)
# If they are parallel all edges need to be compared
else:
find_closest_by_distance(boundary1, boundary2)
# Store found values in standard FreeCAD properties
for boundary in boundaries:
closest_boundaries, boundary.ClosestEdges, closest_distances = (
list(i) for i in zip(*boundary.Proxy.closest)
)
boundary.ClosestBoundaries = [b.Id if b else -1 for b in closest_boundaries]
boundary.ClosestDistance = [int(d) for d in closest_distances]
def set_leso_type(space):
for boundary in space.SecondLevel.Group:
# LesoType is defined in previous steps for curtain walls
if boundary.LesoType != "Unknown":
continue
boundary.LesoType = define_leso_type(boundary)
def define_leso_type(boundary):
try:
ifc_type = boundary.RelatedBuildingElement.IfcType
except AttributeError:
if boundary.PhysicalOrVirtualBoundary != "VIRTUAL":
logger.warning(f"Unable to define LesoType for boundary <{boundary.Id}>")
return "Unknown"
if ifc_type.startswith("IfcWindow"):
return "Window"
elif ifc_type.startswith("IfcDoor"):
return "Door"
elif ifc_type.startswith("IfcWall"):
return "Wall"
elif ifc_type.startswith("IfcSlab") or ifc_type == "IfcRoof":
# Pointing up => Ceiling. Pointing down => Flooring
if boundary.Normal.z > 0:
return "Ceiling"
return "Flooring"
elif ifc_type.startswith("IfcOpeningElement"):
return "Opening"
else:
logger.warning(f"Unable to define LesoType for Boundary Id <{boundary.Id}>")
return "Unknown"
def edge_distance_to_edge(edge1: Part.Edge, edge2: Part.Edge) -> float:
mid_point = edge1.CenterOfMass
line_segment = (v.Point for v in edge2.Vertexes)
return mid_point.distanceToLineSegment(*line_segment).Length
def edge_distance_to_line(edge, line):
mid_point = edge.CenterOfMass
return mid_point.distanceToLine(line.Location, line.Direction)
def is_low_angle(edge1, edge2):
try:
dir1 = (edge1.Vertexes[1].Point - edge1.Vertexes[0].Point).normalize()
dir2 = (edge2.Vertexes[1].Point - edge2.Vertexes[0].Point).normalize()
return (
abs(dir1.dot(dir2)) > 0.866
) # Low angle considered as < 30°. cos(pi/6)=0.866.
except IndexError:
return False
def create_sia_boundaries(doc=FreeCAD.ActiveDocument):
"""Create boundaries necessary for SIA calculations"""
for space in utils.get_elements_by_ifctype("IfcSpace", doc):
create_sia_ext_boundaries(space)
create_sia_int_boundaries(space)
rejoin_boundaries(space, "SIA_Exterior")
rejoin_boundaries(space, "SIA_Interior")
Progress.set()
def get_intersecting_line(boundary1, boundary2) -> Optional[Part.Line]:
plane_intersect = utils.get_plane(boundary1).intersectSS(utils.get_plane(boundary2))
return plane_intersect[0] if plane_intersect else None
def get_medial_axis(boundary1, boundary2, ei1, ei2) -> Optional[Part.Line]:
line1 = utils.line_from_edge(utils.get_outer_wire(boundary1).Edges[ei1])
try:
line2 = utils.line_from_edge(utils.get_outer_wire(boundary2).Edges[ei2])
except IndexError:
logger.warning(
f"""Cannot find closest edge index <{ei2}> in boundary <{boundary2.Label}>
to rejoin boundary <{boundary1.Label}>"""
)
return None
# Case 2a : edges are not parallel
if abs(line1.Direction.dot(line2.Direction)) < 1 - TOLERANCE:
b1_plane = utils.get_plane(boundary1)
line_intersect = line1.intersect2d(line2, b1_plane)
if line_intersect:
point1 = b1_plane.value(*line_intersect[0])
if line1.Direction.dot(line2.Direction) > 0:
point2 = point1 + line1.Direction + line2.Direction
else:
point2 = point1 + line1.Direction - line2.Direction
# Case 2b : edges are parallel
else:
point1 = (line1.Location + line2.Location) * 0.5
point2 = point1 + line1.Direction
try:
return Part.Line(point1, point2)
except Part.OCCError:
logger.exception(
f"Failure in boundary id <{boundary1.SourceBoundary.Id}> {point1} and {point2} are equal"
)
return None
def is_valid_join(line, fallback_line):
"""Angle < 15 ° is considered as valid join. cos(pi/6 ≈ 0.96)"""
return abs(line.Direction.dot(fallback_line.Direction)) > 0.96
def rejoin_boundaries(space, sia_type):
"""
Rejoin boundaries after their translation to get a correct close shell surfaces.
1 Fill gaps between boundaries (2b)
2 Fill gaps gerenate by translation to make a boundary on the inside or outside boundary of
building elements
https://standards.buildingsmart.org/IFC/RELEASE/IFC4/ADD2_TC1/HTML/schema/ifcproductextension/lexical/ifcrelspaceboundary2ndlevel.htm # pylint: disable=line-too-long
"""
base_boundaries = space.SecondLevel.Group
for base_boundary in base_boundaries:
boundary1 = getattr(base_boundary, sia_type)
if not boundary1:
continue
lines = []
fallback_lines = [
utils.line_from_edge(edge) for edge in utils.get_outer_wire(boundary1).Edges
]
# bound_box used to make sure line solution is in a reallistic scope (distance <= 5 m)
bound_box = boundary1.Shape.BoundBox
bound_box.enlarge(5000)
if (
base_boundary.IsHosted
or base_boundary.PhysicalOrVirtualBoundary == "VIRTUAL"
or not base_boundary.RelatedBuildingElement
):
continue
b1_plane = utils.get_plane(boundary1)
for b2_id, (ei1, ei2), fallback_line in zip(
base_boundary.ClosestBoundaries,
enumerate(base_boundary.ClosestEdges),
fallback_lines,
):
base_boundary2 = utils.get_in_list_by_id(base_boundaries, b2_id)
boundary2 = getattr(base_boundary2, sia_type, None)
if not boundary2:
logger.warning(f"Cannot find corresponding boundary with id <{b2_id}>")
lines.append(fallback_line)
continue
# Case 1 : boundaries are not parallel
line = get_intersecting_line(boundary1, boundary2)
if line:
if not is_valid_join(line, fallback_line):
line = fallback_line
if not bound_box.intersect(line.Location, line.Direction):
line = fallback_line
lines.append(line)
continue
# Case 2 : boundaries are parallel
line = get_medial_axis(boundary1, boundary2, ei1, ei2)
if line and is_valid_join(line, fallback_line):
lines.append(line)
continue
lines.append(fallback_line)
# Generate new shape
try:
outer_wire = utils.polygon_from_lines(lines, b1_plane)
except (Part.OCCError, utils.ShapeCreationError):
logger.exception(
f"Invalid geometry while rejoining boundary Id <{base_boundary.Id}>"
)
continue
try:
Part.Face(outer_wire)
except Part.OCCError:
logger.exception(f"Unable to rejoin boundary Id <{base_boundary.Id}>")
continue
inner_wires = utils.get_inner_wires(boundary1)
try:
utils.generate_boundary_compound(boundary1, outer_wire, inner_wires)
except RuntimeError as err:
logger.exception(err)
continue
boundary1.Area = area = boundary1.Shape.Area
for inner_boundary in base_boundary.InnerBoundaries:
area = area + inner_boundary.Shape.Area
boundary1.AreaWithHosted = area
def create_sia_ext_boundaries(space):
"""Create SIA boundaries from RelSpaceBoundaries and translate it if necessary"""
sia_group_obj = space.Boundaries.newObject(
"App::DocumentObjectGroup", "SIA_Exteriors"
)
space.SIA_Exteriors = sia_group_obj
for boundary1 in space.SecondLevel.Group:
if boundary1.IsHosted or boundary1.PhysicalOrVirtualBoundary == "VIRTUAL":
continue
bem_boundary = BEMBoundary.create(boundary1, "SIA_Exterior")
sia_group_obj.addObject(bem_boundary)
if not boundary1.RelatedBuildingElement:
continue
thickness = boundary1.RelatedBuildingElement.Thickness.Value
leso_type = boundary1.LesoType
normal = boundary1.Normal
# EXTERNAL: there is multiple possible values for external so testing internal is better.
if boundary1.InternalOrExternalBoundary != "INTERNAL":
distance = thickness
# INTERNAL
else:
if leso_type == "Flooring":
distance = 0
elif leso_type == "Ceiling":
distance = thickness
else: # Walls
distance = thickness / 2
bem_boundary.Placement.move(normal * distance + boundary1.TranslationToSpace)
def create_sia_int_boundaries(space):
"""Create boundaries necessary for SIA calculations"""
sia_group_obj = space.Boundaries.newObject(
"App::DocumentObjectGroup", "SIA_Interiors"
)
space.SIA_Interiors = sia_group_obj
for boundary in space.SecondLevel.Group:
if boundary.IsHosted or boundary.PhysicalOrVirtualBoundary == "VIRTUAL":
continue
bem_boundary = BEMBoundary.create(boundary, "SIA_Interior")
sia_group_obj.addObject(bem_boundary)
# Bad location in some software like Revit (last check : revit-ifc 21.1.0.0)
if not boundary.TranslationToSpace.isEqual(FreeCAD.Vector(), TOLERANCE):
bem_boundary.Placement.move(boundary.TranslationToSpace)
class XmlResult(NamedTuple):
xml: str
log: str
def generate_bem_xml_from_file(ifc_path: str) -> XmlResult:
try:
import pyCaller
Progress.progress_func = pyCaller.SetProgress
except ImportError:
pass
Progress.set(0, "IfcImport_OpenIfcFile", "")
ifc_importer = IfcImporter(ifc_path)
ifc_importer.generate_rel_space_boundaries()
doc = ifc_importer.doc
processing_sia_boundaries(doc)
Progress.set(90, "Communicate_Write", "")
xml_str = write_xml(doc).tostring()
log_str = LOG_STREAM.getvalue()
Progress.set(100, "Communicate_Send", "")
return XmlResult(xml_str, log_str)
def process_test_file(ifc_path, doc):
ifc_importer = IfcImporter(ifc_path, doc)
ifc_importer.generate_rel_space_boundaries()
processing_sia_boundaries(doc)
bem_xml = write_xml(doc)
output_xml_to_path(bem_xml)
ifc_importer.xml = bem_xml
ifc_importer.log = LOG_STREAM.getvalue()
if FreeCAD.GuiUp:
FreeCADGui.activeView().viewIsometric()
FreeCADGui.SendMsgToActiveView("ViewFit")
with open("./boundaries.log", "w", encoding="utf-8") as log_file:
log_file.write(ifc_importer.log)
return ifc_importer
class InvalidMergeError(RuntimeError):
pass

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