We recommend installing the opensim package before installing any other packages in a conda environment as this will mitigate the risk of conflicts between packages and issues with using opensim. The common symptom of this incorrect matching between python version and opensim package is failing to load simbody DLL on windows. for python version 3.8, conda install -c opensim-org opensim=4.4=p圓8np120). In case of mismatch, you can specify which package to install in the one line installer (e.g. Keep an eye if your python version is the same as the one indicated by the package name (e.g. This however is not always true since conda also has to resolve dependencies and make arbitrary decisions. We rely on conda to download the correct version for your environment/python-version. Python changed how libraries are loaded on windows in version 3.8 so that PATH is not used to locate libraries, accordingly different instructions apply in these scenarios. Once sorted out you should remove opensim from the base environment and install only in custom environments as needed. This is to be understood as a troubleshooting method especially if you have other installations of opensim on your machine. Conda has a base environment but allows creation of environments with different python versions, it is less likely to have problems if you install the opensim package in the base environment so you have access to it in other created environments. Conda independently tries to locate the correct package for your environment, and prompts users before installation, please double check the suggested package to make sure it matches your environment/expectations. opensim-4.4-p圓9np120) suggests a package built for python version 3.9 and using numpy version 1.20. 
Conda packages are built for specific python version, indicated by the package name (e.g.The conda package is self contained, has no connection to any other OpenSim distribution including the OpenSim application.There're a couple issues that you need to know about regarding conda packaging: > conda install -c opensim-org opensim Issues to keep in mind: The list of conda packages will grow as community needs evolve over time and as new variants are published. 'opensim-moco' which includes Moco functionalityīoth packages are built with variants for different python versions (3.7, 3.8, 3.9) and numpy version 1.20, with other dependencies included (simbody, ezc3d).
'opensim' which includes functionality in OpenSim 4.4 but without Moco (to avoid potential collision with other packages). Starting with OpenSim version 4.4, we provide conda packages to support development in python+conda environment.
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