h radius closest to the desired radius.</p>

<p>The position of the bowl is set by <code>bowl_pos</code>, which corresponds to the center of the rear bowl surface. The orientation of the bowl is set by <code>focus_pos</code>, which corresponds to any point on the axis of the bowl (note, this must not be equal to <code>bowl_pos</code>). It is assumed that the solid angle of the bowl is equal to or less than 2*pi steradians. If the <code>radius</code> is set to <code>inf</code>, a disc is generated.</p>

<p>I