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><head><title>gleTwistExtrusion</title><link rel="stylesheet" href="style.css" type="text/css"/><meta name="generator" content="DocBook XSL Stylesheets V1.59.1"/><link rel="home" href="index.xml" title="PyOpenGL 2.0.1.04 Man Pages"/><link rel="up" href="reference-GLE.xml" title="GLE"/><link rel="previous" href="gleToroid.3GLE.xml" title="gleToroid"/></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">gleTwistExtrusion</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="gleToroid.3GLE.xml">Prev</a> </td><th width="60%" align="center">GLE</th><td width="20%" align="right"> </td></tr></table><hr/></div><div class="refentry" lang="en"><a name="gleTwistExtrusion.3GLE"/><div class="titlepage"/><div class="refnamediv"><a name="gleTwistExtrusion.3GLE-name"/><h2>Name</h2><p>gleTwistExtrusion &#8212; Extrude arbitrary 2D contour along arbitrary 3D path, specifying local rotations (twists).</p></div><div class="refsynopsisdiv"><a name="gleTwistExtrusion.3GLE-c_spec"/><h2>C Specification</h2><table class="funcprototype" border="0" cellpadding="0" cellspacing="0"><tr><td valign="top"><code>void <tt>gleTwistExtrusion</tt></code></td><td valign="top"><code>(</code></td><td valign="top"><code>int <i><tt>ncp</tt></i>, gleDouble <i><tt>contour</tt></i>[][2], gleDouble <i><tt>cont_normal</tt></i>[][2], gleDouble <i><tt>up</tt></i>[3], int <i><tt>npoints</tt></i>, gleDouble <i><tt>point_array</tt></i>[][3], float <i><tt>color_array</tt></i>[][3], gleDouble <i><tt>twist_array</tt></i>[]);</code></td></tr></table></div><div class="refsynopsisdiv"><a name="gleTwistExtrusion.3GLE-python_specification"/><h2>Python Specification</h2><table class="funcprototype" border="0" cellpadding="0" cellspacing="0"><tr><td valign="top"><code><tt>gleTwistExtrusion</tt></code></td><td valign="top"><code>(</code></td><td valign="top"><code><i><tt>contour</tt></i>[][2], <i><tt>cont_normal</tt></i>[][2], <i><tt>up</tt></i>[3], <i><tt>point_array</tt></i>[][3], <i><tt>color_array</tt></i>[][3], <i><tt>twist_array</tt></i>[]) &#8594; <tt>None</tt></code></td></tr></table></div><div class="refsect1" lang="en"><a name="gleTwistExtrusion.3GLE-parameters"/><h2>Parameters</h2><div class="variablelist"><dl><dt><span class="term"><i><tt>ncp</tt></i></span></dt><dd>
						number of contour points
					</dd><dt><span class="term"><i><tt>contour</tt></i></span></dt><dd>
						2D contour
					</dd><dt><span class="term"><i><tt>cont_normal</tt></i></span></dt><dd>
						2D contour normals
					</dd><dt><span class="term"><i><tt>up</tt></i></span></dt><dd>
						up vector for contour
					</dd><dt><span class="term"><i><tt>npoints</tt></i></span></dt><dd>
						numpoints in poly-line
					</dd><dt><span class="term"><i><tt>point_array</tt></i></span></dt><dd>
						polyline vertices
					</dd><dt><span class="term"><i><tt>color_array</tt></i></span></dt><dd>
						colors at polyline verts
					</dd><dt><span class="term"><i><tt>twist_array</tt></i></span></dt><dd>
						contour twists (in degrees)
					</dd></dl></div></div><div class="refsect1" lang="en"><a name="gleTwistExtrusion.3GLE-description"/><h2>Description</h2><p>
			Extrude arbitrary 2D contour along arbitrary 3D path, specifying local rotations (twists). As the contour is extruded,
			it will be twisted by the amount specified in the array <i><tt>twist_array</tt></i>. The angles are measured in
			degrees, and the rotation is about the origin of the contour coordinate system.
		</p><p>
			The argument <i><tt>contour</tt></i> specifies the 2D contour to be extruded, while the argument
			<i><tt>point_array</tt></i> specifies the path along which to extrude. The vector <i><tt>up</tt></i>
			defines the orientation of the contour y-axis in real 3D space.
		</p><p>
			Note that neither the very first segment, nor the very last segment are drawn. The first and last segments serve only
			to define the angle of the join at the very ends of the polyline. Thus, to draw one segment, three must be specified.
			To draw two segments, four must be specified, etc.
		</p><p>
			The normal array may be <tt>NULL</tt>. If it is, normal vectors will <span class="bold"><b>not</b></span>
			be automatically generated, and the object will look terrible when lit.
		</p><p>
			The color array may be <tt>NULL</tt>. If <tt>NULL</tt>, the current color is used. If not
			<tt>NULL</tt>, the <a href="glColor.3G.xml"><tt>glColor3f</tt></a> routine is used to set the color;
			therefore, specifying the <a href="glColorMaterial.3G.xml"><tt>glColorMaterial</tt></a> subroutine before this primitive can
			be used to set diffuse, specular, ambient, etc. colors.
		</p></div><div class="refsect1" lang="en"><a name="gleTwistExtrusion.3GLE-see_also"/><h2>See Also</h2><p>
			<span class="simplelist"><a href="gleExtrusion.3GLE.xml">gleExtrusion</a>, <a href="gleSuperExtrusion.3GLE.xml">gleSuperExtrusion</a></span>
		</p></div><div class="refsect1" lang="en"><a name="gleTwistExtrusion.3GLE-author"/><h2>Author</h2><p>
			Linas Vepstas
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