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103 lines
4.9 KiB
XML
103 lines
4.9 KiB
XML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
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"http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
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<refentry id="gluLoadSamplingMatrices">
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<refmeta>
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<refmetainfo>
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<copyright>
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<year>1991-2006</year>
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<holder>Silicon Graphics, Inc.</holder>
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</copyright>
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</refmetainfo>
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<refentrytitle>gluLoadSamplingMatrices</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>gluLoadSamplingMatrices</refname>
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<refpurpose>load NURBS sampling and culling matrices</refpurpose>
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</refnamediv>
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<refsynopsisdiv><title>C Specification</title>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>gluLoadSamplingMatrices</function></funcdef>
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<paramdef>GLUnurbs* <parameter>nurb</parameter></paramdef>
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<paramdef>const GLfloat * <parameter>model</parameter></paramdef>
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<paramdef>const GLfloat * <parameter>perspective</parameter></paramdef>
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<paramdef>const GLint * <parameter>view</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<!-- eqn: ignoring delim $$ -->
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<refsect1 id="parameters"><title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><parameter>nurb</parameter></term>
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<listitem>
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<para>
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Specifies the NURBS object (created with <citerefentry><refentrytitle>gluNewNurbsRenderer</refentrytitle></citerefentry>).
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>model</parameter></term>
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<listitem>
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<para>
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Specifies a modelview matrix (as from a <citerefentry><refentrytitle>glGetFloatv</refentrytitle></citerefentry> call).
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>perspective</parameter></term>
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<listitem>
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<para>
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Specifies a projection matrix (as from a <citerefentry><refentrytitle>glGetFloatv</refentrytitle></citerefentry> call).
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>view</parameter></term>
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<listitem>
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<para>
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Specifies a viewport (as from a <citerefentry><refentrytitle>glGetIntegerv</refentrytitle></citerefentry> call).
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1 id="description"><title>Description</title>
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<para>
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<function>gluLoadSamplingMatrices</function> uses <parameter>model</parameter>, <parameter>perspective</parameter>, and <parameter>view</parameter> to recompute the sampling and culling
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matrices stored in <parameter>nurb</parameter>.
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The sampling matrix determines how finely a NURBS curve or surface
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must be tessellated to satisfy the sampling tolerance (as determined by the
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<constant>GLU_SAMPLING_TOLERANCE</constant> property).
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The culling matrix is used in deciding if a NURBS curve or surface
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should be culled before
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rendering (when the <constant>GLU_CULLING</constant> property is turned on).
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</para>
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<para>
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<function>gluLoadSamplingMatrices</function> is necessary only if the <constant>GLU_AUTO_LOAD_MATRIX</constant> property is turned
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off (see <citerefentry><refentrytitle>gluNurbsProperty</refentrytitle></citerefentry>).
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Although it can be convenient to leave the <constant>GLU_AUTO_LOAD_MATRIX</constant>
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property turned on, there can be a performance penalty for doing so.
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(A round trip to the GL server is needed to fetch the current values
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of the modelview matrix, projection matrix, and viewport.)
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</para>
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</refsect1>
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<refsect1 id="seealso"><title>See Also</title>
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<para>
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<citerefentry><refentrytitle>gluGetNurbsProperty</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>gluNewNurbsRenderer</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>gluNurbsProperty</refentrytitle></citerefentry>
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</para>
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</refsect1>
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<refsect1 id="Copyright"><title>Copyright</title>
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<para>
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Copyright <trademark class="copyright"></trademark> 1991-2006
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Silicon Graphics, Inc. This document is licensed under the SGI
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Free Software B License. For details, see
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<ulink url="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</ulink>.
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</para>
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</refsect1>
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</refentry>
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