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# Install Geomdl
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In the simplest case, you can install Geomdl by
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$ /path/to/blender/2.xx/python/bin/python3.7m -m pip install -U geomdl
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but this way you will get pure-python library, which is very slow. If you want
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it fast, then you have to install Cython (see previous paragraph for
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instruction). After you installed Cython, you can install "cythonized" geomdl
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as it is described in [Geomdl instruction][9]:
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$ /path/to/blender/2.xx/python/bin/python3 -m pip install geomdl --install-option="--use-cython"
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### Windows
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To get geomdl to compile
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After you install Cython via pip...
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Install the same version of Python that your install of Blender uses from [python.org][18]
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* Blender 2.9 == [Python 3.7][19]
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This will give you the /includes and /libs. Make sure on the Advanced screen of the installer you choose 'Precompile standard library' and
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'Download debugging symbols'
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After install is complete, open up a Command Prompt (not Powershell). You will be making symbolic links from the /libs and /include from the python installation.
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* For the ```/libs``` directory
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```
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mklink /D "C:\Program Files\Blender Foundation\Blender 2.90\2.90\python\libs" "C:\Users\<username>\AppData\Local\Programs\Python\Python37\libs"
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```
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* For the ```/include``` directory
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```
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mklink /D "C:\Program Files\Blender Foundation\Blender 2.90\2.90\python\include" "C:\Users\<USERNAME>\AppData\Local\Programs\Python\Python37\include"
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```
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You should now be able to install geomdl with ```--use-cython``` arguments
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The following nodes become available only when you install Geomdl:
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* Approximate NURBS Curve
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* Approximate NURBS Surface
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* Interpolate NURBS Surface
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* Quads to NURBS
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* NURBS to JSON
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* JSON to NURBS
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The following nodes can optionally use Geomdl:
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* Build NURBS Curve
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* Build NURBS Surface
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* Interpolating Surface
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* Interpolate NURBS Curve
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* NURBS In
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[9]: https://nurbs-python.readthedocs.io/en/latest/install.html
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[18]: https://www.python.org
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[19]: https://www.python.org/downloads/release/python-377/ |
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