An acceleration-based jigglebone system with soft-body/squash-and-stretch physics for SkinnedMeshRenderers in Unity.
- GPU per-vertex deformations via shader, squash/stretch based on vertex color masks.
- Purely acceleration based, elevators don't cause things to float/sag.
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Works at all framerates with very little differences in the physics solve. (It's unhooked from a fixed timestep as well!)
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Can run on LateUpdate, FixedUpdate, and Update.
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Only runs when mesh is visible.
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Comes with a JiggleSurfaceApproximator which can keep a transform attached to the "skin" of a mesh. Great for censorbars and attachments that can't be added directly to the mesh.
This unity repository actually comes with a fully working project, with a working model in an example scene. If anything below doesn't make sense, download the project!
- Use the included AmplifyShader node to add the vertex deformations to whatever shader you want. (URP, HDRP, Standard, whatever!).
- Make sure your model has RGBA vertex-color masks for how bouncy parts of the model is, keep individual neighboring bouncing parts as different colors.
- Set up a JiggleSoftbody with sensors overlapped in such a way that each "individual" bouncy part has its own sensor.
- Add JiggleBones for the primary movement.
You can install Jiggle Physics with OpenUPM by checking out the badge above. Otherwise...
Simply add https://github.com/naelstrof/UnityJigglePhysics.git#upm as a package using the package manager.
Or if that doesn't work, add it to the manifest.json like so.
{
"dependencies": {
"com.naelstrof.jigglephysics": "https://github.com/naelstrof/UnityJigglePhysics.git#upm",
}
}