Commit | Line | Data |
---|---|---|
7faf1d71 AW |
1 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "xhtml1-transitional.dtd"> |
2 | <!-- saved from url=(0013)about:internet --> | |
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>glNormal</title><meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /></head><body><div class="refentry" lang="en" xml:lang="en"><a id="glNormal"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glNormal — set the current normal vector</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">void <b class="fsfunc">glNormal3b</b>(</code></td><td>GLbyte </td><td><var class="pdparam">nx</var>, </td></tr><tr><td> </td><td>GLbyte </td><td><var class="pdparam">ny</var>, </td></tr><tr><td> </td><td>GLbyte </td><td><var class="pdparam">nz</var><code>)</code>;</td></tr></table></div><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"><tr><td><code class="funcdef">void <b class="fsfunc">glNormal3d</b>(</code></td><td>GLdouble </td><td><var class="pdparam">nx</var>, </td></tr><tr><td> </td><td>GLdouble </td><td><var class="pdparam">ny</var>, </td></tr><tr><td> </td><td>GLdouble </td><td><var class="pdparam">nz</var><code>)</code>;</td></tr></table></div><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"><tr><td><code class="funcdef">void <b class="fsfunc">glNormal3f</b>(</code></td><td>GLfloat </td><td><var class="pdparam">nx</var>, </td></tr><tr><td> </td><td>GLfloat </td><td><var class="pdparam">ny</var>, </td></tr><tr><td> </td><td>GLfloat </td><td><var class="pdparam">nz</var><code>)</code>;</td></tr></table></div><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"><tr><td><code class="funcdef">void <b class="fsfunc">glNormal3i</b>(</code></td><td>GLint </td><td><var class="pdparam">nx</var>, </td></tr><tr><td> </td><td>GLint </td><td><var class="pdparam">ny</var>, </td></tr><tr><td> </td><td>GLint </td><td><var class="pdparam">nz</var><code>)</code>;</td></tr></table></div><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"><tr><td><code class="funcdef">void <b class="fsfunc">glNormal3s</b>(</code></td><td>GLshort </td><td><var class="pdparam">nx</var>, </td></tr><tr><td> </td><td>GLshort </td><td><var class="pdparam">ny</var>, </td></tr><tr><td> </td><td>GLshort </td><td><var class="pdparam">nz</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>nx</code></em>, </span><span class="term"><em class="parameter"><code>ny</code></em>, </span><span class="term"><em class="parameter"><code>nz</code></em></span></dt><dd><p> | |
4 | Specify the | |
5 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">x</mml:mi></mml:math>, | |
6 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">y</mml:mi></mml:math>, | |
7 | and | |
8 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">z</mml:mi></mml:math> | |
9 | coordinates of the new current normal. | |
10 | The initial value of the current normal is the unit vector, (0, 0, 1). | |
11 | </p><p> | |
12 | </p></dd></dl></div></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">void <b class="fsfunc">glNormal3bv</b>(</code></td><td>const GLbyte * </td><td><var class="pdparam">v</var><code>)</code>;</td></tr></table></div><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"><tr><td><code class="funcdef">void <b class="fsfunc">glNormal3dv</b>(</code></td><td>const GLdouble * </td><td><var class="pdparam">v</var><code>)</code>;</td></tr></table></div><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"><tr><td><code class="funcdef">void <b class="fsfunc">glNormal3fv</b>(</code></td><td>const GLfloat * </td><td><var class="pdparam">v</var><code>)</code>;</td></tr></table></div><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"><tr><td><code class="funcdef">void <b class="fsfunc">glNormal3iv</b>(</code></td><td>const GLint * </td><td><var class="pdparam">v</var><code>)</code>;</td></tr></table></div><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"><tr><td><code class="funcdef">void <b class="fsfunc">glNormal3sv</b>(</code></td><td>const GLshort * </td><td><var class="pdparam">v</var><code>)</code>;</td></tr></table></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="parameters2"></a><h2>Parameters</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>v</code></em></span></dt><dd><p> | |
13 | Specifies a pointer to an array of three elements: | |
14 | the | |
15 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">x</mml:mi></mml:math>, | |
16 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">y</mml:mi></mml:math>, | |
17 | and | |
18 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">z</mml:mi></mml:math> | |
19 | coordinates of the new current normal. | |
20 | </p><p> | |
21 | </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p> | |
22 | The current normal is set to the given coordinates | |
23 | whenever <code class="function">glNormal</code> is issued. | |
24 | Byte, short, or integer arguments are converted to floating-point | |
25 | format with a linear mapping that maps the most positive representable integer | |
26 | value to 1.0 | |
27 | and the most negative representable integer value to | |
28 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
29 | ||
30 | <mml:mn>-1.0</mml:mn> | |
31 | </mml:math>. | |
32 | </p><p> | |
33 | Normals specified with <code class="function">glNormal</code> need not have unit length. | |
34 | If <code class="constant">GL_NORMALIZE</code> is enabled, | |
35 | then normals of any length specified with <code class="function">glNormal</code> are normalized after transformation. | |
36 | If <code class="constant">GL_RESCALE_NORMAL</code> is enabled, normals are scaled by a scaling factor | |
37 | derived from the modelview matrix. <code class="constant">GL_RESCALE_NORMAL</code> requires that the | |
38 | originally specified normals were of unit length, and that the modelview | |
39 | matrix contain only uniform scales for proper results. | |
40 | To enable and disable normalization, call <a class="citerefentry" href="glEnable.xml"><span class="citerefentry"><span class="refentrytitle">glEnable</span></span></a> and <a class="citerefentry" href="glDisable.xml"><span class="citerefentry"><span class="refentrytitle">glDisable</span></span></a> | |
41 | with either <code class="constant">GL_NORMALIZE</code> or <code class="constant">GL_RESCALE_NORMAL</code>. | |
42 | Normalization is initially disabled. | |
43 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="notes"></a><h2>Notes</h2><p> | |
44 | The current normal can be updated at any time. | |
45 | In particular, <code class="function">glNormal</code> can be called between a call to <a class="citerefentry" href="glBegin.xml"><span class="citerefentry"><span class="refentrytitle">glBegin</span></span></a> and | |
46 | the corresponding call to <a class="citerefentry" href="glEnd.xml"><span class="citerefentry"><span class="refentrytitle">glEnd</span></span></a>. | |
47 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="associatedgets"></a><h2>Associated Gets</h2><p> | |
48 | <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_CURRENT_NORMAL</code> | |
49 | </p><p> | |
50 | <a class="citerefentry" href="glIsEnabled.xml"><span class="citerefentry"><span class="refentrytitle">glIsEnabled</span></span></a> with argument <code class="constant">GL_NORMALIZE</code> | |
51 | </p><p> | |
52 | <a class="citerefentry" href="glIsEnabled.xml"><span class="citerefentry"><span class="refentrytitle">glIsEnabled</span></span></a> with argument <code class="constant">GL_RESCALE_NORMAL</code> | |
53 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p> | |
54 | <a class="citerefentry" href="glBegin.xml"><span class="citerefentry"><span class="refentrytitle">glBegin</span></span></a>, | |
55 | <a class="citerefentry" href="glColor.xml"><span class="citerefentry"><span class="refentrytitle">glColor</span></span></a>, | |
56 | <a class="citerefentry" href="glIndex.xml"><span class="citerefentry"><span class="refentrytitle">glIndex</span></span></a>, | |
57 | <a class="citerefentry" href="glMultiTexCoord.xml"><span class="citerefentry"><span class="refentrytitle">glMultiTexCoord</span></span></a>, | |
58 | <a class="citerefentry" href="glNormalPointer.xml"><span class="citerefentry"><span class="refentrytitle">glNormalPointer</span></span></a>, | |
59 | <a class="citerefentry" href="glTexCoord.xml"><span class="citerefentry"><span class="refentrytitle">glTexCoord</span></span></a>, | |
60 | <a class="citerefentry" href="glVertex.xml"><span class="citerefentry"><span class="refentrytitle">glVertex</span></span></a> | |
61 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p> | |
62 | Copyright <span class="trademark"></span>© 1991-2006 | |
63 | Silicon Graphics, Inc. This document is licensed under the SGI | |
64 | Free Software B License. For details, see | |
65 | <a class="ulink" href="http://oss.sgi.com/projects/FreeB/" target="_top">http://oss.sgi.com/projects/FreeB/</a>. | |
66 | </p></div></div></body></html> |