About
Hyfydy is software for accurate, high-performance biomechanical simulation. It aims to combine the accuracy of OpenSim with the simulation speed of MuJoCo.
Hyfydy is available for Windows, Linux and macOS, as a plugin for SCONE and via a Python API for machine learning applications. Feel free to contact us, check us out on YouTube, or request a free trial.
Accuracy
Simulators often use simplified muscle and contact models to increase performance, which leads to inaccurate results — especially in machine learning applications, where control policies learn to exploit simulator artifacts.
Hyfydy implements the same high-quality muscle and contact models as OpenSim. Muscle models support tendon elasticity, pennation and fiber damping. Contact models are force-based, with a Coulomb friction cone based on static, dynamic and viscous friction.
Performance
Hyfydy has been built from the ground up with maximum performance in mind. It provides an approximate 100x speedup over OpenSim – using the same muscle and contact models. Simulation speeds are comparable to MuJoCo, even though Hyfydy uses more advanced and accurate muscle and contact models. In addition, Hyfydy has a low memory footprint, which can be important for large scale optimizations.
Stability
Hyfydy can automatically and efficiently adapt the integration step size to satisfy a user-defined accuracy level. As a result, simulations always remain stable and accurate, without sacrificing performance. There is no need for tuning the integration step size.
Support
Hyfydy clients benefit from comprehensive support, including priority support for feature requests, expert issue resolution, and personalized guidance to ensure your projects achieve their full potential.
Clients
Why Hyfydy?
Accuracy
Accurate muscle and contact dynamics.
Performance
Simulate 100x faster than OpenSim.
Stability
Efficient error control ensures robust simulation.