Function ortho_camera 

pub fn ortho_camera(
    eye: [f64; 3],
    target: [f64; 3],
    up: [f64; 3],
    half_width: f64,
    half_height: f64,
    near: f64,
    far: f64,
) -> Camera

Build a camera from an explicit eye/target/up + ortho frustum (the shared path for the artifact framing and the desktop orbit).