Function skeletal_animation::math::mat3_inv

pub fn mat3_inv<T>(mat: [[T; 3]; 3]) -> [[T; 3]; 3] where
    T: Copy + One + Mul<T, Output = T> + Sub<T, Output = T> + Div<T, Output = T> + Add<T, Output = T>, 

Computes the inverse of a 3x3 matrix.