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See #4216. Document using OpenCASCADE geometry serialisation to create geometry.

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Dion Moult
2024-01-20 14:35:52 +11:00
parent 96c8323a06
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src/ifcopenshell-python/docs/ifcopenshell-python/geometry_creation.rst
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@@ -557,6 +557,45 @@ bar.
For more information, consult the :doc:`shape builder documentation
<autoapi/ifcopenshell/util/shape_builder/index>`.
OpenCASCADE representations
---------------------------
If you are familiar with OpenCASCADE's Python bindings, you may also use
OpenCASCADE directly to create geometry. Since both OpenCASCADE and IFC are
inspired by STEP, the majority of OpenCASCADE shapes will be able to be
converted into IFC. For example:
.. code-block:: python
import ifcopenshell
import ifcopenshell.geom
from OCC.Core.gp import gp_Pnt
from OCC.Core.BRepPrimAPI import BRepPrimAPI_MakeBox
from OCC.Core.BRepAlgoAPI import BRepAlgoAPI_Cut
outer = BRepPrimAPI_MakeBox(gp_Pnt(-5000., -180., -2000.), gp_Pnt(5000., 5180., 3000.)).Shape()
inner = BRepPrimAPI_MakeBox(gp_Pnt(-4640., 180., 0.), gp_Pnt(4640., 4820., 3000.)).Shape()
window1 = BRepPrimAPI_MakeBox(gp_Pnt(-5000., -180., 400.), gp_Pnt( 500., 1180., 2000.)).Shape()
window2 = BRepPrimAPI_MakeBox(gp_Pnt( 2070., -180., 400.), gp_Pnt(3930., 180., 2000.)).Shape()
building_shell = BRepAlgoAPI_Cut(
BRepAlgoAPI_Cut(
BRepAlgoAPI_Cut(outer, inner).Shape(),
window1
).Shape(),
window2
).Shape()
model = ifcopenshell.file(schema="IFC2X3")
product_definition = ifcopenshell.geom.serialise("IFC2X3", building_shell, False)
product_definition = model.add(product_definition)
.. warning::
The schema version is significant. IFC2X3 is very limited with regard to
curved surfaces, so generally non-planar surfaces will fail to serialise in
IFC2X3. Newer versions such as IFC4 can support more serialisations. If a
serialisation fails, ``ifcopenshell.geom.serialise`` will return ``None``.
Manual representations
----------------------