auto convert brep to mesh for IFC2x3

CHANGELOG.md

@@ -10,9 +10,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 
 * Added `export` method to `IFCFile` and `Model` to export selected list of entities.
+* Added `update_linear_deflection` to `Model`.
 
 ### Changed
 
+* Automatically convert `Brep` to `Mesh` when assigned in `IFC2X3`.
+
 ### Removed
 
 

src/compas_ifc/file.py

@@ -34,6 +34,7 @@ def __init__(self, model, filepath=None, schema="IFC4", use_occ=False, load_geom
         else:
             self._file = ifcopenshell.open(filepath)
             print("IFC file loaded: {}".format(filepath))
+            self.model.update_linear_deflection()
 
         self._schema = ifcopenshell.ifcopenshell_wrapper.schema_by_name(self._file.schema)
 

src/compas_ifc/model.py

@@ -3,6 +3,7 @@
 
 from compas.data import Data
 from compas.geometry import Transformation
+from compas.tolerance import TOL
 
 from compas_ifc.file import IFCFile
 
@@ -149,6 +150,15 @@ def update_treeform(form, node):
     def create(self, cls="IfcBuildingElementProxy", parent=None, geometry=None, frame=None, properties=None, **kwargs):
         return self.file.create(cls=cls, parent=parent, geometry=geometry, frame=frame, properties=properties, **kwargs)
 
+    def update_linear_deflection(self):
+        length_unit = self.project.length_unit
+        if length_unit["name"] == "METRE" and length_unit["prefix"] == "MILLI":
+            TOL.lineardeflection = 1
+        elif length_unit["name"] == "METRE" and length_unit["prefix"] == "CENTI":
+            TOL.lineardeflection = 1e-1
+        elif length_unit["name"] == "METRE" and not length_unit["prefix"]:
+            TOL.lineardeflection = 1e-3
+
     @classmethod
     def template(cls, schema="IFC4", building_count=1, storey_count=1):
         model = cls(schema=schema)
@@ -158,6 +168,8 @@ def template(cls, schema="IFC4", building_count=1, storey_count=1):
             building = model.create("IfcBuilding", parent=site, Name=f"Default Building {i+1}")
             for j in range(storey_count):
                 model.create("IfcBuildingStorey", parent=building, Name=f"Default Storey {j+1}")
+
+        model.update_linear_deflection()
         return model
 
 

src/compas_ifc/resources/representation.py

@@ -3,6 +3,7 @@
 from compas.geometry import Cone
 from compas.geometry import Cylinder
 from compas.geometry import Sphere
+from compas.tolerance import TOL
 from ifcopenshell.api import run
 
 from .brep import brep_to_ifc_advanced_brep
@@ -35,7 +36,11 @@ def _body_to_shape(body):
             else:
                 shape = mesh_to_IfcShellBasedSurfaceModel(file, body)
         elif OCCBrep and isinstance(body, OCCBrep):
-            shape = brep_to_ifc_advanced_brep(file, body)
+            if file.schema == "IFC2X3":
+                print("IFC2X3 does not support advanced brep, converting representation of {} to mesh.".format(ifc_entity))
+                shape = mesh_to_IfcShellBasedSurfaceModel(file, body.to_viewmesh(linear_deflection=TOL.lineardeflection)[0])
+            else:
+                shape = brep_to_ifc_advanced_brep(file, body)
         else:
             raise Exception("Unsupported body type.")
         return shape