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<h5 class="subsubsection">3.1.5.6 Internal options</h5>
<p>There are also <em>internal</em> options
<a name="index-options_002c-internal-260"></a><a name="index-internal-options-261"></a>used only by <code>sketch</code> and not
passed on to <code>PSTricks</code>. These are summarized in the following
table.
<a name="index-cull-262"></a><a name="index-lay-263"></a><a name="index-split-264"></a>
<p><table summary=""><tr align="left"><th valign="top">Key </th><th valign="top">Possible values </th><th valign="top">Description
<br></th></tr><tr align="left"><td valign="top"><code>cull</code>
</td><td valign="top"><code>true</code>, <code>false</code>
</td><td valign="top">Turn culling of backfaces on and off respectively for this object.
The default value is <code>true</code>.
<br></td></tr><tr align="left"><td valign="top"><code>lay</code>
</td><td valign="top"><code>over</code>, <code>in</code>, <code>under</code>
</td><td valign="top">Force this object to be <code>under</code> or
<code>over</code> all other objects in the depth sort
<a name="index-depth-sort-265"></a>order created by the hidden surface algorithm. The default value
<code>over</code> guarantees that output due to the <code>special</code> will be
visible.
<br></td></tr><tr align="left"><td valign="top"><code>split</code>
</td><td valign="top"><code>true</code>, <code>false</code>
</td><td valign="top">Turn splitting of sweep-generated body polygons
<a name="index-body-polygon-266"></a><a name="index-polygon_002c-body-267"></a>on and off respectively. See <a href="Sweeps.html#Sweeps">Sweeps</a>. The default value <code>true</code>
causes “warped” polygons to be split into triangles, which avoids
mistakes by the hidden surface algorithm.
<br></td></tr></table>
<h4 class="subsection">3.1.6 Point lists</h4>
<p><a name="index-point-list-268"></a><strong>Syntax:</strong>
<pre class="example"> (<var>x1</var>,<var>y1</var>,<var>z1</var>)(<var>x2</var>,<var>y2</var>,<var>z2</var>)...
</pre>
<p class="noindent">A sequence of one or more points makes a point list, a feature
common to all drawables. Each of the point components is a scalar
arithmetic expression. Any point may have the z-component
omitted; it will default to z=0.
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<li><a accesskey="1" href="Drawables.html#Drawables">Drawables</a>: Things that are drawn.
<li><a accesskey="2" href="Definitions.html#Definitions">Definitions</a>: Things with names.
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