New IfcPatch recipe to tessellate elements to account for bugs in other vendors.

2026-08-10 17:58:20 +00:00 · 2023-11-21 14:19:47 +11:00
parent c30c9d50c9
commit 37a9a1b5d9
1 changed files with 69 additions and 0 deletions
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+# IfcPatch - IFC patching utiliy
+# Copyright (C) 2023 Dion Moult <dion@thinkmoult.com>
+#
+# This file is part of IfcPatch.
+#
+# IfcPatch is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# IfcPatch is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with IfcPatch.  If not, see <http://www.gnu.org/licenses/>.
+
+import ifcopenshell
+import ifcopenshell.geom
+import ifcopenshell.util.selector
+import ifcopenshell.util.representation
+import multiprocessing
+
+
+class Patcher:
+    def __init__(self, src, file, logger, query="IfcBeam"):
+        """Convert element body representations to tessellations or faceted breps
+
+        Some software have bugs that result in incorrect geometry being
+        imported for more complex representation types, such as CSGs. This
+        patch converts elements matching your query into a tessellation (or
+        faceted brep for IFC2X3) which is generally supported by all
+        implementations. Note that styles and shape aspects are not preserved.
+
+        See example bug: https://github.com/Autodesk/revit-ifc/issues/707
+
+        Example:
+
+        .. code:: python
+
+            ifcpatch.execute({"input": model, "recipe": "TessellateElements", "arguments": ["IfcBeam"]})
+        """
+        self.src = src
+        self.file = file
+        self.logger = logger
+        self.query = query
+
+    def patch(self):
+        context = ifcopenshell.util.representation.get_context(self.file, "Model", "Body", "MODEL_VIEW")
+        elements = ifcopenshell.util.selector.filter_elements(self.file, self.query)
+        settings = ifcopenshell.geom.settings()
+        settings.set_context_ids([context.id()])
+        iterator = ifcopenshell.geom.iterator(settings, self.file, multiprocessing.cpu_count(), include=elements)
+        if iterator.initialize():
+            while True:
+                shape = iterator.get()
+                element = self.file.by_guid(shape.guid)
+                v = [[x.tolist() for x in ifcopenshell.util.shape.get_vertices(shape.geometry)]]
+                f = [ifcopenshell.util.shape.get_faces(shape.geometry)]
+                mesh = ifcopenshell.api.run(
+                    "geometry.add_mesh_representation", self.file, context=context, vertices=v, faces=f
+                )
+                representations = element.Representation.Representations
+                representations = [r for r in representations if r.ContextOfItems != context]
+                representations.append(mesh)
+                element.Representation.Representations = representations
+                if not iterator.next():
+                    break