Function skeletal_animation::math::mat4_inv

pub fn mat4_inv<T>(mat: [[T; 4]; 4]) -> [[T; 4]; 4] where
    T: Copy + One + Add<T, Output = T> + Mul<T, Output = T> + Sub<T, Output = T> + Div<T, Output = T>, 

Computes the inverse of a 4x4 matrix.