chris0214/mikumikuphysics

MikuMikuPhysics is a plugin for Blender 4.2 and newer that adds real-time physics simulation for MMD (MikuMikuDance) character models. MMD is a free animation software popular in Japan for animating virtual characters, and models in the PMX format often have physics-driven elements like hair, skirts, and chains that should move naturally. This plugin reads those physics definitions from a PMX model imported into Blender and simulates them using the Bullet physics engine, the same engine MMD itself uses, so the results look close to the original software. You can preview the simulation in real time as you pose or animate the character, see hair and clothing react to movement, and then bake the physics results into Blender keyframes for final rendering. It also handles multiple characters in a scene, letting them collide with each other. You would use this if you are creating Blender animations using MMD character models and want the physics-driven parts of the character to behave naturally rather than staying static. Python is required, and the plugin is installed through Blender's standard add-on system.