 unvignetted by any clear apertures
or obscurations assigned to any surfaces other than the reference
surface. It could be used to determine how much larger to make the
clear aperture on surface 2 so as to not clip the beam.</p>

<p><strong>
    PLOT NEW<br>
    PLOT SCALE 2 2<br>
    ORIENT 2<br>
    PLOT CLAP 2 2<br>
    FOB 1<br>
    FOOT 2<br>
    PLOT FOOT<br>
    DRAW<br>
</strong></p>

<p>The next string of commands causes a beam footprint to be drawn
which is vignetted by clear apertures and obscura