This is a paid asset, but now you can download Non-Convex Mesh Collider. Automatic Generator Free.
Detail this asset from Unity Asset Store: Original Link
Non-Convex Mesh Collider. Automatic Generator v1.2 (Latest version)
Non-Convex Mesh Collider. Automatic Generator v1.1
“If possible, please buy the package to support the developer”
Need fast, accurate physics but tired of `painting` each triangle to make convex colliders? Just click `Generate`!
Industry standard automatic generation algorithm that other big engines are using!
This asset will save you and your artists tons of time (and money)
NOTE: Runtime bake support added for Windows/macOS standalone players only at this moment. Working on other platforms support!
We would love to hear your feedback!