pub fn ortho<S: BaseFloat>(left: S, right: S, bottom: S, top: S, near: S, far: S) -> Matrix4<S> {
    Ortho {
        left,
        right,
        bottom,
        top,
        near,
        far,
    }
    .into()
}
Create an orthographic projection matrix.

This is the equivalent of the now deprecated [`glOrtho`] function.

[`glOrtho`]: http://www.opengl.org/sdk/docs/man2/xhtml/glOrtho.xml
src/projection.rs