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-<?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>
- Specify the
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">x</mml:mi></mml:math>,
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">y</mml:mi></mml:math>,
- and
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">z</mml:mi></mml:math>
- coordinates of the new current normal.
- The initial value of the current normal is the unit vector, (0, 0, 1).
- </p><p>
- </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>
- Specifies a pointer to an array of three elements:
- the
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">x</mml:mi></mml:math>,
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">y</mml:mi></mml:math>,
- and
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">z</mml:mi></mml:math>
- coordinates of the new current normal.
- </p><p>
- </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p>
- The current normal is set to the given coordinates
- whenever <code class="function">glNormal</code> is issued.
- Byte, short, or integer arguments are converted to floating-point
- format with a linear mapping that maps the most positive representable integer
- value to 1.0
- and the most negative representable integer value to
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <mml:mn>-1.0</mml:mn>
- </mml:math>.
- </p><p>
- Normals specified with <code class="function">glNormal</code> need not have unit length.
- If <code class="constant">GL_NORMALIZE</code> is enabled,
- then normals of any length specified with <code class="function">glNormal</code> are normalized after transformation.
- If <code class="constant">GL_RESCALE_NORMAL</code> is enabled, normals are scaled by a scaling factor
- derived from the modelview matrix. <code class="constant">GL_RESCALE_NORMAL</code> requires that the
- originally specified normals were of unit length, and that the modelview
- matrix contain only uniform scales for proper results.
- 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>
- with either <code class="constant">GL_NORMALIZE</code> or <code class="constant">GL_RESCALE_NORMAL</code>.
- Normalization is initially disabled.
- </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="notes"></a><h2>Notes</h2><p>
- The current normal can be updated at any time.
- 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
- the corresponding call to <a class="citerefentry" href="glEnd.xml"><span class="citerefentry"><span class="refentrytitle">glEnd</span></span></a>.
- </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="associatedgets"></a><h2>Associated Gets</h2><p>
- <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>
- </p><p>
- <a class="citerefentry" href="glIsEnabled.xml"><span class="citerefentry"><span class="refentrytitle">glIsEnabled</span></span></a> with argument <code class="constant">GL_NORMALIZE</code>
- </p><p>
- <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>
- </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p>
- <a class="citerefentry" href="glBegin.xml"><span class="citerefentry"><span class="refentrytitle">glBegin</span></span></a>,
- <a class="citerefentry" href="glColor.xml"><span class="citerefentry"><span class="refentrytitle">glColor</span></span></a>,
- <a class="citerefentry" href="glIndex.xml"><span class="citerefentry"><span class="refentrytitle">glIndex</span></span></a>,
- <a class="citerefentry" href="glMultiTexCoord.xml"><span class="citerefentry"><span class="refentrytitle">glMultiTexCoord</span></span></a>,
- <a class="citerefentry" href="glNormalPointer.xml"><span class="citerefentry"><span class="refentrytitle">glNormalPointer</span></span></a>,
- <a class="citerefentry" href="glTexCoord.xml"><span class="citerefentry"><span class="refentrytitle">glTexCoord</span></span></a>,
- <a class="citerefentry" href="glVertex.xml"><span class="citerefentry"><span class="refentrytitle">glVertex</span></span></a>
- </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p>
- Copyright <span class="trademark"></span>© 1991-2006
- Silicon Graphics, Inc. This document is licensed under the SGI
- Free Software B License. For details, see
- <a class="ulink" href="http://oss.sgi.com/projects/FreeB/" target="_top">http://oss.sgi.com/projects/FreeB/</a>.
- </p></div></div></body></html>
HCoop / clinton / guile-figl.git / blobdiff