ai agent phys sim

For Physics & Body Mechanics (Embodiment)MuJoCo (Multi-Joint dynamics with Contact): This is the gold-standard physics engine for robotics and biological simulation (now open-source and maintained by Google DeepMind). It is incredibly fast and handles complex muscle/joint mechanics perfectly.  Unity + ML-Agents: If you want a more visual, Minecraft-like sandbox, Unity’s ML-Agents toolkit allows you to build a 3D world, design a creature, and stick a neural network inside it using Python.For Evolutionary/Emergence SimulationsBiogenesis / Critterding / GenePool: If you want pure "digital primordial soup" where creatures evolve eyes, limbs, and hunting behaviors over thousands of generations, these are great lightweight, ready-to-run software packages.Neural MMO: A project specifically designed for researching large-scale multi-agent emergence in a massive, RPG-like environment.