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1. If paths to previous OpenSim versions exist on your PYTHONPATH environment variable, remove them. (If you used OpenSim 4.2 with Python, this step is likely necessary.)
2. Download Anaconda. (If not done already)
3. Download the Anaconda environment file (conda_env.yml) and place it directory of your choice; perhaps <RESOURCES_DIR>\Code\Python. This environment includes the following packages:
   
   1. Python 3.8
   2. NumPy 1.20.2
   3. Matplotlib
   4. Spyder (Python IDE)
4. Open the Anaconda Prompt.

5. Before proceeding, you may need to initialize conda for shell interaction by running (If not done already)

   Code Block
   C:\> conda init <shell-name>

   where <shell-name> is one of the following: cmd.exe (Windows default) or powershell.

6. Navigate to the location of the Anaconda environment file. For example, if using cmd.exe:

   Code Block
   C:\> cd "C:\Users\<profile>\Documents\OpenSim\4.3\Code\Python"

   
   

7. Create the environment from the file:

   Code Block
   C:\> conda env create -f conda_env.yml

   
   

8. Deactivate any existing environments and activate the OpenSim scripting environment. The prefix "opensim_scripting" should now appear in the Anaconda Prompt.

   Code Block
   (base) C:\> conda deactivate C:\> conda activate opensim_scripting (opensim_scripting) C:\>

   
   

9. Navigate to folder sdk\Python in the OpenSim 4.3 installation; perhaps C:\OpenSim 4.3\sdk\Python.

10. First, run the following script:

    Code Block
    (opensim_scripting) C:\> python setup_win_python38.py

    
    

11. Install OpenSim by running

    Code Block
    (opensim_scripting) C:\> python -m pip install .

    
    

12. Once installation completes, test the configuration by checking the timestamp from running 

    Code Block
    (opensim_scripting) C:\> python >>> import opensim as osim >>> osim.GetVersionAndDate() >>> quit()

    in the Anaconda Prompt. Test that the visualizer is working by running the following

    Code Block
    (opensim_scripting) C:\> cd "C:\Users\<PROFILE_NAME_HERE>\Documents\OpenSim\4.3\Code\Python\Moco" (opensim_scripting) C:\> python exampleSlidingMass.py

    You should see a visualizer window appear with a sliding mass animation. Hit ESC twice to close the window. If you get an error about loading DLL failure check that PATH has been updated correctly before relaunching the shell.

13. Scripting can be performed by using a text editor and running the scripts from the Anaconda Prompt via "python <script_name>.py". However, if you prefer using an interactive development environment (IDE) similar to Matlab, we've included the Spyder IDE in the Anaconda environment. Launch Spyder by simply running

    Code Block
    (opensim_scripting) C:\> spyder

    
    

$ cd /Applications/OpenSim 4.0/sdk/Python
$ sudo python setup.py install

$ export DYLD_LIBRARY_PATH=$DYLD_LIBRARY_PATH:<OPENSIM_INSTALL_DIR>/lib

$ python
...
>>> import opensim
>>> m = opensim.Model()

1. If paths to previous OpenSim versions exist on your PYTHONPATH environment variable, remove them. (If you used OpenSim 4.2 with Python, this step is likely necessary.)
2. Download Anaconda.
3. Download the Anaconda environment file (conda_env.yml) and place it directory of your choice; perhaps <RESOURCES_DIR>/Code/Python. This environment includes the following packages:
   
   1. Python 3.8
   2. NumPy 1.20.2
   3. Matplotlib
   4. Spyder (Python IDE)
4. Open the terminal.

5. Before proceeding, you may need to initialize conda for shell interaction by running

   Code Block
   $ conda init <shell-name>

   where <shell-name> is one of the following: bash (macOS default), fish, zsh, tcsh, or xonsh.

6. Navigate to the location of the Anaconda environment file:

   Code Block
   $ cd /Users/<profile>/Documents/OpenSim/4.3/Code/Python

   
   

7. Create the environment from the file:

   Code Block
   $ conda env create -f conda_env.yml

   
   

8. Deactivate any existing environments and activate the OpenSim scripting environment. The prefix "opensim_scripting" should now appear in the terminal (it may appear on the right side of the screen).

   Code Block
   (base) $ conda deactivate $ conda activate opensim_scripting (opensim_scripting) $

   
   

9. Navigate to folder sdk/Python in the OpenSim 4.3 installation; perhaps /Applications/OpenSim 4.3.

10. Install OpenSim by running

    Code Block
    (opensim_scripting) $ python -m pip install .

    
    

11. You may need to update the DYLD_LIBRARY_PATH to include the OpenSim and Simbody libraries:

    
    

    Code Block
    (opensim_scripting) $ export DYLD_LIBRARY_PATH="$DYLD_LIBRARY_PATH:<YOUR_INSTALL_DIRECTORY_HERE>/sdk/lib" (opensim_scripting) $ export DYLD_LIBRARY_PATH="$DYLD_LIBRARY_PATH:<YOUR_INSTALL_DIRECTORY_HERE>/sdk/Simbody/lib"

    
    

12. Once installation completes, test the configuration by checking the timestamp from running 

    Code Block
    (opensim_scripting) $ python >>> import opensim as osim >>> osim.GetVersionAndDate() >>> quit()

    in the terminal. Test that the visualizer is working by running the following

    Code Block
    (opensim_scripting) $ cd "/Users/<PROFILE_NAME_HERE>/Documents/OpenSim/4.3/Code/Python/Moco" (opensim_scripting) $ python exampleSlidingMass.py

    You should see a visualizer window appear with a sliding mass animation. Hit ESC twice to close the window. If you get an error about loading DLL failure check that PATH has been updated correctly before relaunching the shell.

13. Scripting can be performed by using a text editor and running the scripts from the Anaconda Prompt via "python <script_name>.py". However, if you prefer using an interactive development environment (IDE) similar to Matlab, we've included the Spyder IDE in the Anaconda environment. Launch Spyder by simply running

    Code Block
    (opensim_scripting) $ spyder