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1 | <?xml version="1.0" encoding="UTF-8"?> |
2 | <!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN" | |
3 | "http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd"> | |
4 | <refentry id="gluLoadSamplingMatrices"> | |
5 | <refmeta> | |
6 | <refmetainfo> | |
7 | <copyright> | |
8 | <year>1991-2006</year> | |
9 | <holder>Silicon Graphics, Inc.</holder> | |
10 | </copyright> | |
11 | </refmetainfo> | |
12 | <refentrytitle>gluLoadSamplingMatrices</refentrytitle> | |
13 | <manvolnum>3G</manvolnum> | |
14 | </refmeta> | |
15 | <refnamediv> | |
16 | <refname>gluLoadSamplingMatrices</refname> | |
17 | <refpurpose>load NURBS sampling and culling matrices</refpurpose> | |
18 | </refnamediv> | |
19 | <refsynopsisdiv><title>C Specification</title> | |
20 | <funcsynopsis> | |
21 | <funcprototype> | |
22 | <funcdef>void <function>gluLoadSamplingMatrices</function></funcdef> | |
23 | <paramdef>GLUnurbs* <parameter>nurb</parameter></paramdef> | |
24 | <paramdef>const GLfloat * <parameter>model</parameter></paramdef> | |
25 | <paramdef>const GLfloat * <parameter>perspective</parameter></paramdef> | |
26 | <paramdef>const GLint * <parameter>view</parameter></paramdef> | |
27 | </funcprototype> | |
28 | </funcsynopsis> | |
29 | </refsynopsisdiv> | |
30 | <!-- eqn: ignoring delim $$ --> | |
31 | <refsect1 id="parameters"><title>Parameters</title> | |
32 | <variablelist> | |
33 | <varlistentry> | |
34 | <term><parameter>nurb</parameter></term> | |
35 | <listitem> | |
36 | <para> | |
37 | Specifies the NURBS object (created with <citerefentry><refentrytitle>gluNewNurbsRenderer</refentrytitle></citerefentry>). | |
38 | </para> | |
39 | </listitem> | |
40 | </varlistentry> | |
41 | <varlistentry> | |
42 | <term><parameter>model</parameter></term> | |
43 | <listitem> | |
44 | <para> | |
45 | Specifies a modelview matrix (as from a <citerefentry><refentrytitle>glGetFloatv</refentrytitle></citerefentry> call). | |
46 | </para> | |
47 | </listitem> | |
48 | </varlistentry> | |
49 | <varlistentry> | |
50 | <term><parameter>perspective</parameter></term> | |
51 | <listitem> | |
52 | <para> | |
53 | Specifies a projection matrix (as from a <citerefentry><refentrytitle>glGetFloatv</refentrytitle></citerefentry> call). | |
54 | </para> | |
55 | </listitem> | |
56 | </varlistentry> | |
57 | <varlistentry> | |
58 | <term><parameter>view</parameter></term> | |
59 | <listitem> | |
60 | <para> | |
61 | Specifies a viewport (as from a <citerefentry><refentrytitle>glGetIntegerv</refentrytitle></citerefentry> call). | |
62 | </para> | |
63 | </listitem> | |
64 | </varlistentry> | |
65 | </variablelist> | |
66 | </refsect1> | |
67 | <refsect1 id="description"><title>Description</title> | |
68 | <para> | |
69 | <function>gluLoadSamplingMatrices</function> uses <parameter>model</parameter>, <parameter>perspective</parameter>, and <parameter>view</parameter> to recompute the sampling and culling | |
70 | matrices stored in <parameter>nurb</parameter>. | |
71 | The sampling matrix determines how finely a NURBS curve or surface | |
72 | must be tessellated to satisfy the sampling tolerance (as determined by the | |
73 | <constant>GLU_SAMPLING_TOLERANCE</constant> property). | |
74 | The culling matrix is used in deciding if a NURBS curve or surface | |
75 | should be culled before | |
76 | rendering (when the <constant>GLU_CULLING</constant> property is turned on). | |
77 | </para> | |
78 | <para> | |
79 | <function>gluLoadSamplingMatrices</function> is necessary only if the <constant>GLU_AUTO_LOAD_MATRIX</constant> property is turned | |
80 | off (see <citerefentry><refentrytitle>gluNurbsProperty</refentrytitle></citerefentry>). | |
81 | Although it can be convenient to leave the <constant>GLU_AUTO_LOAD_MATRIX</constant> | |
82 | property turned on, there can be a performance penalty for doing so. | |
83 | (A round trip to the GL server is needed to fetch the current values | |
84 | of the modelview matrix, projection matrix, and viewport.) | |
85 | </para> | |
86 | </refsect1> | |
87 | <refsect1 id="seealso"><title>See Also</title> | |
88 | <para> | |
89 | <citerefentry><refentrytitle>gluGetNurbsProperty</refentrytitle></citerefentry>, | |
90 | <citerefentry><refentrytitle>gluNewNurbsRenderer</refentrytitle></citerefentry>, | |
91 | <citerefentry><refentrytitle>gluNurbsProperty</refentrytitle></citerefentry> | |
92 | </para> | |
93 | </refsect1> | |
94 | <refsect1 id="Copyright"><title>Copyright</title> | |
95 | <para> | |
96 | Copyright <trademark class="copyright"></trademark> 1991-2006 | |
97 | Silicon Graphics, Inc. This document is licensed under the SGI | |
98 | Free Software B License. For details, see | |
99 | <ulink url="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</ulink>. | |
100 | </para> | |
101 | </refsect1> | |
102 | </refentry> |