span class='comma'>,</span> <span class='id identifier rubyid_z'>z</span><span class='comma'>,</span> <span class='id identifier rubyid_r'>r</span><span class='comma'>,</span> <span class='id identifier rubyid_material'>material</span><span class='rparen'>)</span>
</code></pre>

<p>where the <em>material</em> is an FXMaterial instance.</p>


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