Import/Export IFC - compiling IfcOpenShell/ru

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Тема
Руководство
Arch Workbench
Уровень
Advanced
Время для завершения
120 minutes
Авторы
Pablo Gil
FreeCAD версия

Примеры файлов

Смотрите также
None

Введение

Было проведено настолько большое исследование о получении рабочей копии IfcOpenShell-python на OSX/macOS для импорта/экспорта файлов IFC, что я делюсь этим учебником для помощи остальным. Моя система OSX 10.11.6, 64 бит с Python 2.7.11, она должна работать для Вас если у Вас так же OSX, поскольку она обычно 64 бит, но, возможно, не так как у меня. Процедура должна быть очень похожа при работе в Linux или Windows, но, вероятно, с отличиями.

Requirements

IfcOpenShell
FreeCAD v0.19 or higher

Steps

1. Download or clone the full GitHub project at https://github.com/IfcOpenShell/IfcOpenShell (it will always be the newest version)

git clone https://github.com/IfcOpenShell/IfcOpenShell

2. From a terminal go to /nix/ folder and launch the script. In OSX it is executed with:

cd nix/
./build-all.sh

It will take from 30 up to 120 minutes to compile everything. It's not the smarter way of compiling IfcOpenShell but this simple script will compile all dependencies, Python versions, etc.

3. Once it finishes (I don't remember now but it will be printed something like "Built IfcOpenShell..." and it will return to your prompt) you will have a new folder /IfcOpenShell/build/ full of files and folders. From my personal experience, two weeks ago the nix "build-all.sh" script didn't finished successfully but after trying it yesterday with the newest updates it worked fine so I guess you might experience something similar in case the development goes further... So now you have everything you need but you have to do some manual work in order to get it working:

4. Open FreeCAD and open the Python console and Report view. Then write into the Python console the following:

import sys
print sys.path

You will get a looooong line with all the paths that FreeCAD reads. You may be able to install IfcOpenShell in any of them but I suggest you to place it inside one where you find a /site-packages/ after a /Python/ or /python-something/. In my case it was /Library/Python/2.7/site-packages. (Note: you will find paths inside your app directory but I suggest you to not use them because then IfcOpenShell will only be available for this app)

5. Once located where you want/have to install it, go there with your file browser (Finder in OSX). That is, go inside /site-packages/ folder

cd site-packages/

6. Open a new file browser window and navigate to your downloaded GitHub project: /IfcOpenShell/src/ifcopenshell-python/ and copy the full /ifcopenshell/ folder

7. Paste it inside /site-packages/ folder. Now you should have something like:

/site-packages/ifcopenshell/__init__.py
/site-packages/ifcopenshell/entity_instance.py
/site-packages/ifcopenshell/file.py
/site-packages/ifcopenshell/geom/app.py
/site-packages/ifcopenshell/geom/main.py
/site-packages/ifcopenshell/geom/occ_utils.py
/site-packages/ifcopenshell/geom/__init__.py
/site-packages/ifcopenshell/guid.py

8. Now we have to pick to files inside the /build/ folder, they are:

_ifcopenshell_wrapper.so
ifcopenshell_wrapper.py

but as we have compiled everything you will have to pick the one that matches with your FreeCAD Python version. Check it easily reading the first line inside your FreeCAD Python console view. In my case it was Python 2.7.11.

9. Now go let's copy the files inside the place it corresponds to your Python version. In my case it was:

/IfcOpenShell/build/Darwin/x86_64/build/ifcopenshell/[b]python-2.7[/b].10/ifcwrap/

10. Paste them inside /site-packages/ifcopenshell/

11. Check everything is in place:

/site-packages/ifcopenshell/__init__.py                  (1)
/site-packages/ifcopenshell/entity_instance.py           (1)
/site-packages/ifcopenshell/_ifcopenshell_wrapper.so     (2)
/site-packages/ifcopenshell/file.py                      (1)
/site-packages/ifcopenshell/geom/__init__.py             (1)
/site-packages/ifcopenshell/geom/app.py                  (1)
/site-packages/ifcopenshell/geom/main.py                 (1)
/site-packages/ifcopenshell/geom/occ_utils.py            (1)
/site-packages/ifcopenshell/guid.py                      (1)
/site-packages/ifcopenshell/ifcopenshell_wrapper.py      (2)

(1) from GitHub project
(2) from /build/ folder

12. Close and reopen FreeCAD

Testing

Now that it is installed, let's check if everything works as expected:

12.1 in the Python console write:

import ifcopenshell
from ifcopenshell import geom

if it doesn't throw any error it means it may be correctly installed

12.2 Go to Yorik's FreeCAD manual, navigate to the lower part of the page and download the following files to test:

house.FCStd
house.ifc

12.3 Open house.FCStd, select the root "Building" object and export it (File → Export) setting the File type to "Industry Foundation Classes (*.ifc)". Press Save and if it works and it doesn't throw an error in the Report view then it's working.

12.4 Final test, import house.ifc into a new file so open a new file and import that file... it will take a while.

13. Enjoy BIM with FreeCAD!

Final thoughts

My opinion is that FreeCAD itself should have precompiled versions of IfcOpenShell bundled with the distribution because building it by yourself is a total pain and average user won't do it (they don't know how to compile, manage GitHub, etc), but well, maybe in the future.

I hope it helps you.

Cheers