1 <!DOCTYPE html PUBLIC
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3 <?xml-stylesheet type=
"text/xsl" href=
"mathml.xsl"?><html xmlns=
"http://www.w3.org/1999/xhtml" xmlns:
pref=
"http://www.w3.org/2002/Math/preference" pref:
renderer=
"mathplayer-dl"><head><meta http-equiv=
"Content-Type" content=
"text/html; charset=UTF-8" /><title>gluProject
</title><meta name=
"generator" content=
"DocBook XSL Stylesheets V1.73.2" /></head><body><div class=
"refentry" lang=
"en" xml:
lang=
"en"><a id=
"gluProject"></a><div class=
"titlepage"></div><div class=
"refnamediv"><h2>Name
</h2><p>gluProject — map object coordinates to window coordinates
</p></div><div class=
"refsynopsisdiv"><h2>C Specification
</h2><div class=
"funcsynopsis"><table border=
"0" summary=
"Function synopsis" cellspacing=
"0" cellpadding=
"0"><tr><td><code class=
"funcdef">GLint
<b class=
"fsfunc">gluProject
</b>(
</code></td><td>GLdouble
</td><td><var class=
"pdparam">objX
</var>,
</td></tr><tr><td> </td><td>GLdouble
</td><td><var class=
"pdparam">objY
</var>,
</td></tr><tr><td> </td><td>GLdouble
</td><td><var class=
"pdparam">objZ
</var>,
</td></tr><tr><td> </td><td>const GLdouble *
</td><td><var class=
"pdparam">model
</var>,
</td></tr><tr><td> </td><td>const GLdouble *
</td><td><var class=
"pdparam">proj
</var>,
</td></tr><tr><td> </td><td>const GLint *
</td><td><var class=
"pdparam">view
</var>,
</td></tr><tr><td> </td><td>GLdouble*
</td><td><var class=
"pdparam">winX
</var>,
</td></tr><tr><td> </td><td>GLdouble*
</td><td><var class=
"pdparam">winY
</var>,
</td></tr><tr><td> </td><td>GLdouble*
</td><td><var class=
"pdparam">winZ
</var><code>)
</code>;
</td></tr></table></div></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"parameters"></a><h2>Parameters
</h2><div class=
"variablelist"><dl><dt><span class=
"term"><em class=
"parameter"><code>objX
</code></em>,
</span><span class=
"term"><em class=
"parameter"><code>objY
</code></em>,
</span><span class=
"term"><em class=
"parameter"><code>objZ
</code></em></span></dt><dd><p>
4 Specify the object coordinates.
5 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>model
</code></em></span></dt><dd><p>
6 Specifies the current modelview matrix (as from a
<a class=
"citerefentry" href=
"glGetDoublev.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGetDoublev
</span></span></a> call).
7 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>proj
</code></em></span></dt><dd><p>
8 Specifies the current projection matrix (as from a
<a class=
"citerefentry" href=
"glGetDoublev.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGetDoublev
</span></span></a> call).
9 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>view
</code></em></span></dt><dd><p>
10 Specifies the current viewport (as from a
<a class=
"citerefentry" href=
"glGetIntegerv.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGetIntegerv
</span></span></a> call).
11 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>winX
</code></em>,
</span><span class=
"term"><em class=
"parameter"><code>winY
</code></em>,
</span><span class=
"term"><em class=
"parameter"><code>winZ
</code></em></span></dt><dd><p>
12 Return the computed window coordinates.
13 </p></dd></dl></div></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"description"></a><h2>Description
</h2><p>
14 <code class=
"function">gluProject
</code> transforms the specified object coordinates into window coordinates
15 using
<em class=
"parameter"><code>model
</code></em>,
<em class=
"parameter"><code>proj
</code></em>, and
<em class=
"parameter"><code>view
</code></em>. The result is stored
16 in
<em class=
"parameter"><code>winX
</code></em>,
<em class=
"parameter"><code>winY
</code></em>, and
<em class=
"parameter"><code>winZ
</code></em>. A return value of
17 <code class=
"constant">GLU_TRUE
</code> indicates success, a return value of
<code class=
"constant">GLU_FALSE
</code>
20 To compute the coordinates,
22 <mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll">
25 <mml:mi mathvariant=
"italic">v
</mml:mi>
27 <mml:mfenced open=
"(" close=
")">
28 <mml:mi mathvariant=
"italic">objX
</mml:mi>
29 <mml:mi mathvariant=
"italic">objY
</mml:mi>
30 <mml:mi mathvariant=
"italic">objZ
</mml:mi>
35 represented as a matrix with
4 rows and
1 column.
36 Then
<code class=
"function">gluProject
</code> computes
37 <mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll">
39 <mml:msup><mml:mi mathvariant=
"italic">v
</mml:mi>
45 </p><div class=
"informalequation"><mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll">
48 <mml:msup><mml:mi mathvariant=
"italic">v
</mml:mi>
53 <mml:mi mathvariant=
"italic">P
</mml:mi>
55 <mml:mi mathvariant=
"italic">M
</mml:mi>
57 <mml:mi mathvariant=
"italic">v
</mml:mi>
63 <mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll"><mml:mi mathvariant=
"italic">P
</mml:mi></mml:math>
64 is the current projection matrix
<em class=
"parameter"><code>proj
</code></em> and
65 <mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll"><mml:mi mathvariant=
"italic">M
</mml:mi></mml:math>
67 modelview matrix
<em class=
"parameter"><code>model
</code></em> (both represented as
68 <mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll">
76 matrices in column-major order).
78 The window coordinates are then computed as follows:
80 </p><div class=
"informalequation"><mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll">
83 <mml:mi mathvariant=
"italic">winX
</mml:mi>
87 <mml:mi mathvariant=
"italic">view
</mml:mi>
89 <mml:mfenced open=
"(" close=
")">
97 <mml:mi mathvariant=
"italic">view
</mml:mi>
99 <mml:mfenced open=
"(" close=
")">
104 <mml:mfenced open=
"(" close=
")">
107 <mml:msup><mml:mi mathvariant=
"italic">v
</mml:mi>
111 <mml:mfenced open=
"(" close=
")">
126 </p><div class=
"informalequation"><mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll">
129 <mml:mi mathvariant=
"italic">winY
</mml:mi>
133 <mml:mi mathvariant=
"italic">view
</mml:mi>
135 <mml:mfenced open=
"(" close=
")">
143 <mml:mi mathvariant=
"italic">view
</mml:mi>
145 <mml:mfenced open=
"(" close=
")">
150 <mml:mfenced open=
"(" close=
")">
153 <mml:msup><mml:mi mathvariant=
"italic">v
</mml:mi>
157 <mml:mfenced open=
"(" close=
")">
173 </p><div class=
"informalequation"><mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll">
176 <mml:mi mathvariant=
"italic">winZ
</mml:mi>
179 <mml:mfenced open=
"(" close=
")">
182 <mml:msup><mml:mi mathvariant=
"italic">v
</mml:mi>
186 <mml:mfenced open=
"(" close=
")">
200 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"seealso"></a><h2>See Also
</h2><p>
201 <a class=
"citerefentry" href=
"gluUnProject.xml"><span class=
"citerefentry"><span class=
"refentrytitle">gluUnProject
</span></span></a>,
202 <a class=
"citerefentry" href=
"glGet.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGet
</span></span></a>
203 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"Copyright"></a><h2>Copyright
</h2><p>
204 Copyright
<span class=
"trademark"></span>©
1991-
2006
205 Silicon Graphics, Inc. This document is licensed under the SGI
206 Free Software B License. For details, see
207 <a class=
"ulink" href=
"http://oss.sgi.com/projects/FreeB/" target=
"_top">http://oss.sgi.com/projects/FreeB/
</a>.
208 </p></div></div></body></html>