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<a name="Transparency"></a>
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Next: <a href="Internal-options.html#Internal-options" accesskey="n" rel="next">Internal options</a>, Previous: <a href="TikZ_002fPGF-user_002ddefined-styles.html#TikZ_002fPGF-user_002ddefined-styles" accesskey="p" rel="prev">TikZ/PGF user-defined styles</a>, Up: <a href="Options.html#Options" accesskey="u" rel="up">Options</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index-of-syntax.html#Index-of-syntax" title="Index" rel="index">Index</a>]</p>
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<hr>
<a name="Transparency-1"></a>
<h4 class="subsubsection">3.1.5.5 Transparency</h4>
<a name="index-transparency"></a>
<p>Both <code>PSTricks</code> and <code>TikZ/PGF</code> support polygon options that
have the effect of making the polygon appear transparent. For
<code>PSTricks</code>, keyword <code>transpalpha</code> was used during initial
development of transparency features, and <code>opacity</code> was adopted
later. <code>Sketch</code> honors both. <code>TikZ/PGF</code> uses <code>opacity</code> only.
<a name="index-transpalpha"></a>
<a name="index-opacity"></a>
<a name="index-fill-opacity"></a>
When transparent polygons are in the foreground, objects behind them
(drawn earlier) are visible with color subdued and tinted. The hidden
surface algorithm of <code>sketch</code> works well with such transparent
polygons.
</p>
<p>Note that <tt>cull=false</tt>
<a name="index-cull-2"></a>
must be used for rear-facing polygons to be visible when positioned
behind other transparent surfaces.
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