https://fishfolk.github.io/jumpy/book/developers/rustdoc/jumpy/core/physics/rapier/nalgebra/base/coordinates/struct.M4x4.html
M4x4 in jumpy::core::physics::rapier::nalgebra::base::coordinates - Rust
Data structure used to provide access to matrix and vector coordinates with the dot notation, e.g., `v.x` is the same as `v[0]` for a vector.
jumpycorephysicsrapiernalgebra