get solid geometry with IfcOpenShell 0.8.3

bernd · May 27

We're trying to switch to 0.8.x ...

We do extract geometry out of ifc in brep format.
We do process this geometry by the use of FreeCAD.

Follows up:

By the use of the new geometry kernel we do not know how to easily get the geometry into FreeCAD (brep was native FreeCAD geometry )?
or
By the use of the occ geometry kernel we do realized occ seams no longer part of ifcopenshell. Is this true?
https://docs.ifcopenshell.org/ifcopenshell/geometry_settings.html#use-python-opencascade

PS: I made a related post on FreeCAD forum but after some more work on this I realized this is more a IfcOpenShell problem ... thus this post here ... https://forum.freecad.org/viewtopic.php?t=97333

aothms · June 1

Just the setting names became strings

>>> st = ifcopenshell.geom.settings()
>>> st.set('use-python-opencascade', True)

OpenCASCADE is not gone. It's just there is also the possibility to use CGAL now, which is currently of no use when you want to interface with FreeCAD

bernd · June 1

Thomas, thanks for the hint, but somehow OCC is not part of the ifcopenshell which comes with pip ?

on windows ... in a PowerShell ...

(myvenv) PS C:\0_BHA_privat\BIMTesterCode\myvenv\Scripts>
(myvenv) PS C:\0_BHA_privat\BIMTesterCode\myvenv\Scripts> python -m pip install ifcopenshell
Requirement already satisfied: ifcopenshell in c:\0_bha_privat\bimtestercode\myvenv\lib\site-packages (0.8.2)
Requirement already satisfied: numpy in c:\0_bha_privat\bimtestercode\myvenv\lib\site-packages (from ifcopenshell) (1.26.4)
Requirement already satisfied: python-dateutil in c:\0_bha_privat\bimtestercode\myvenv\lib\site-packages (from ifcopenshell) (2.9.0.post0)
Requirement already satisfied: shapely in c:\0_bha_privat\bimtestercode\myvenv\lib\site-packages (from ifcopenshell) (2.1.1)
Requirement already satisfied: lark in c:\0_bha_privat\bimtestercode\myvenv\lib\site-packages (from ifcopenshell) (1.2.2)
Requirement already satisfied: isodate in c:\0_bha_privat\bimtestercode\myvenv\lib\site-packages (from ifcopenshell) (0.7.2)
Requirement already satisfied: typing-extensions in c:\0_bha_privat\bimtestercode\myvenv\lib\site-packages (from ifcopenshell) (4.13.2)
Requirement already satisfied: six>=1.5 in c:\0_bha_privat\bimtestercode\myvenv\lib\site-packages (from python-dateutil->ifcopenshell) (1.17.0)

[notice] A new release of pip available: 22.3.1 -> 25.1.1
[notice] To update, run: python.exe -m pip install --upgrade pip
(myvenv) PS C:\0_BHA_privat\BIMTesterCode\myvenv\Scripts>

in Python:

Python 3.10.11 (tags/v3.10.11:7d4cc5a, Apr  5 2023, 00:38:17) [MSC v.1929 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>>
>>> import ifcopenshell
>>> ifcopenshell.version
'0.8.2'
>>>
>>> from ifcopenshell import geom
>>> settings = geom.settings()
>>> settings.set('use-python-opencascade', True)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\0_BHA_privat\BIMTesterCode\myvenv\lib\site-packages\ifcopenshell\geom\main.py", line 179, in set
    raise AttributeError("Python OpenCASCADE is not installed")
AttributeError: Python OpenCASCADE is not installed
>>>
>>>

bernd · June 1

is there a version to download available which includes Python OpenCascade, which could I copy to my site-packages manually ?

aothms · June 1

Thomas, thanks for the hint, but somehow OCC is not part of the ifcopenshell which comes with pip ?

No, but that has always been the case. The OCC C++ code is linked in into the executable, but PythonOCC is not packaged as part of the python module. Easiest way to install is using anaconda conda install -c conda-forge pythonocc

bernd · June 1

Ahh, I got the point now ...

bernd · June 2

@aothms said:

Thomas, thanks for the hint, but somehow OCC is not part of the ifcopenshell which comes with pip ?

No, but that has always been the case. The OCC C++ code is linked in into the executable, but PythonOCC is not packaged as part of the python module. Easiest way to install is using anaconda conda install -c conda-forge pythonocc

I still have som missunderstandings, because it works without installing PythonOCC for 0.7.x

New env
no ifcopenshell in site-packages
get latest 0.7.0 from here ... https://github.com/IfcOpenBot/IfcOpenShell/commit/c7830e9e5b8a8ae359f6c92e5330600b5b002a92#comments
copy to site packages
start python

# 0.7.x
import ifcopenshell
ifcopenshell.version
from ifcopenshell import geom
settings = geom.settings()
settings.set(settings.USE_BREP_DATA, True)
settings.set(settings.SEW_SHELLS, True)
settings.set(settings.USE_WORLD_COORDS, True)
ifcpath = 'C:/Users/BHA/Desktop/exporter.ifc'
ifcfile = ifcopenshell.open(ifcpath)
p=ifcfile.by_type("IfcBuildingElement")[0]
p.Name
p.GlobalId
cr = ifcopenshell.geom.create_shape(settings, p)
brep = cr.geometry.brep_data
brep

>>>
>>> import ifcopenshell
>>> ifcopenshell.version
'v0.7.0-c7830e9e5'
>>> from ifcopenshell import geom
>>> settings = geom.settings()
>>> settings.set(settings.USE_BREP_DATA, True)
>>> settings.set(settings.SEW_SHELLS, True)
>>> settings.set(settings.USE_WORLD_COORDS, True)
>>> ifcpath = 'C:/Users/BHA/Desktop/exporter.ifc'
>>> ifcfile = ifcopenshell.open(ifcpath)
>>> p=ifcfile.by_type("IfcBuildingElement")[0]
>>> p.Name
'Beschriftung_meshed'
>>> p.GlobalId
'3CUsmHJ1r0x96Xw23d0w_r'
>>> cr = ifcopenshell.geom.create_shape(settings, p)
>>> brep = cr.geometry.brep_data
>>> brep
'\nCASCADE Topology V1, (c) Matra-Datavision\nLocations 1\n1\n              1               0               0  102.2121953125 \n              0               1               0   74.7216015625 \n              0               0               1    -4.415953125 \nCurve2ds 0\nCurves 93\n1 0 0.32534374999999999 0.18697265625000001 0 0.35813583799135751 -0.93366949267191335 \n1 0 0.32534374999999999 0.18697265625000001 0 -1 0 \n1 0 0.29871874999999998 0.18697265625000001 0 -0.37838207834077947 -0.92564950320869954 \n1 0 0.2222890625 0 0 1 0 \n1 0 0.2504374999999
...
-65 0 *\nFa\n0  1e-07 30 0\n\n0101000\n-26 0 *\nEd\n 1e-07 1 1 0\n1  88 0 0 0.015\n0\n\n0101000\n+64 0 -39 0 *\nWi\n\n0101100\n+27 0 -36 0 -24 0 -63 0 *\nFa\n0  1e-07 31 0\n\n0101000\n-23 0 *\nEd\n 1e-07 1 1 0\n1  89 0 0 0.015\n0\n\n0101000\n+62 0 -41 0 *\nWi\n\n0101100\n+24 0 -38 0 -21 0 -61 0 *\nFa\n0  1e-07 32 0\n\n0101000\n-20 0 *\nEd\n 1e-07 1 1 0\n1  90 0 0 0.015\n0\n\n0101000\n+60 0 -44 0 *\nWi\n\n0101100\n+21 0 -40 0 -18 0 -59 0 *\nFa\n0  1e-07 33 0\n\n0101000\n-17 0 *\nEd\n 1e-07 1 1 0\n1  91 0 0 0.015\n0\n\n0101000\n+58 0 -43 0 *\nWi\n\n0101100\n+18 0 +42 0 -15 0 -57 0 *\nFa\n0  1e-07 34 0\n\n0101000\n-14 0 *\nEd\n 1e-07 1 1 0\n1  92 0 0 0.015\n0\n\n0101000\n+56 0 -32 0 *\nWi\n\n0101100\n-55 0 +15 0 -30 0 -12 0 *\nFa\n0  1e-07 35 0\n\n0101000\n-11 0 *\nEd\n 1e-07 1 1 0\n1  93 0 0 0.015\n0\n\n0101000\n+70 0 -34 0 *\nWi\n\n0101100\n-54 0 +12 0 -31 0 -9 0 *\nFa\n0  1e-07 36 0\n\n0101000\n-8 0 *\nWi\n\n0101100\n+69 0 +9 0 -33 0 -50 0 *\nFa\n0  1e-07 37 0\n\n0101000\n-6 0 *\nSh\n\n0101100\n+52 0 +45 0 +28 0 +25 0 +22 0 +19 0 +16 0 +13 0 +10 0 +7 0 \n+5 0 *\nSo\n\n0100000\n+4 0 *\nCo\n\n0100000\n+141 0 +72 0 +3 0 *\nCo\n\n1100000\n+2 1 *\n\n+1 0 '
>>>

aothms · June 2

Ah that's what you mean. That indeed doesn't depend on pythonocc.
settings.set(settings.USE_BREP_DATA, True)
became
settings.set('iterator-output', ifcopenshell.ifcopenshell_wrapper.SERIALIZED)

bernd · June 2

great :-) thanks very much Thomas ...

>>> import ifcopenshell
>>> ifcopenshell.version
'0.8.2'
>>>
>>> from ifcopenshell import geom
>>> settings = geom.settings()
>>> settings.set('iterator-output', ifcopenshell.ifcopenshell_wrapper.SERIALIZED)
>>>
>>> ifcpath = 'C:/Users/BHA/Desktop/exporter.ifc'
>>> ifcfile = ifcopenshell.open(ifcpath)
>>>
>>> p = ifcfile.by_type("IfcBuildingElement")[0]
>>> p.Name
'Beschriftung_meshed'
>>> p.GlobalId
'3CUsmHJ1r0x96Xw23d0w_r'
>>>
>>> cr = ifcopenshell.geom.create_shape(settings, p)
>>> brep = cr.geometry.brep_data
>>>
>>> brep
'\nCASCADE Topology V2, (c) Matra-Datavision\nLocations 0\nCurve2ds 0\nCurves 93\n1 0 0.32534374999999999 0.18697265625000001 0 -1 0 \n1 0 0.32534374999999999 0.18697265625000001 0 0.35813583799135751 -0.93366949267191335 \n1 0 0.39706249999999998 0 0 -1 0 \n1 0 0.37082031250000003 0 0 -0.34250248078992379 0.93951692409

aothms · June 2

You probably still want to set the other settings

st.set('reorient-shells', True)
st.set('use-world-coords', True)

bernd · June 2

ahh for sure, because they are not included in iterator-output ...

Eventually the problem was, I was totally on the wrong track ...

bernd · June 2

for reference ...

import ifcopenshell
# ifcopenshell.version
from ifcopenshell import geom as ifcgeom
settings = ifcgeom.settings()
settings.set('iterator-output', ifcopenshell.ifcopenshell_wrapper.SERIALIZED)
settings.set('reorient-shells', True)
settings.set('use-world-coords', True)
ifcpath = 'C:/Users/BHA/Desktop/exporter.ifc'
ifcfile = ifcopenshell.open(ifcpath)
p = ifcfile.by_type("IfcBuildingElement")[0]
p.Name
p.GlobalId
cr = ifcopenshell.geom.create_shape(settings, p)
brep = cr.geometry.brep_data
brep

get solid geometry with IfcOpenShell 0.8.3

Comments