Function get_camera_matrix 

pub fn get_camera_matrix(camera: impl Into<Camera3D>) -> Matrix

Returns camera transform matrix (view matrix)

use raylib::prelude::*;
fn main() {
    let c = Camera::perspective(
           Vector3::zero(),
           Vector3::new(0.0, 0.0, -1.0),
           Vector3::up(),
           90.0,
       );
       let m = get_camera_matrix(&c);
       assert_eq!(m, Matrix::identity());
}