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200 lines
9.5 KiB
XML
200 lines
9.5 KiB
XML
<?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="glNormal">
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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>glNormal</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glNormal</refname>
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<refpurpose>set the current normal vector</refpurpose>
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</refnamediv>
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<!-- eqn: ignoring delim $$ -->
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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>glNormal3b</function></funcdef>
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<paramdef>GLbyte <parameter>nx</parameter></paramdef>
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<paramdef>GLbyte <parameter>ny</parameter></paramdef>
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<paramdef>GLbyte <parameter>nz</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glNormal3d</function></funcdef>
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<paramdef>GLdouble <parameter>nx</parameter></paramdef>
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<paramdef>GLdouble <parameter>ny</parameter></paramdef>
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<paramdef>GLdouble <parameter>nz</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glNormal3f</function></funcdef>
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<paramdef>GLfloat <parameter>nx</parameter></paramdef>
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<paramdef>GLfloat <parameter>ny</parameter></paramdef>
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<paramdef>GLfloat <parameter>nz</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glNormal3i</function></funcdef>
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<paramdef>GLint <parameter>nx</parameter></paramdef>
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<paramdef>GLint <parameter>ny</parameter></paramdef>
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<paramdef>GLint <parameter>nz</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glNormal3s</function></funcdef>
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<paramdef>GLshort <parameter>nx</parameter></paramdef>
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<paramdef>GLshort <parameter>ny</parameter></paramdef>
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<paramdef>GLshort <parameter>nz</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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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>nx</parameter></term>
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<term><parameter>ny</parameter></term>
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<term><parameter>nz</parameter></term>
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<listitem>
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<para>
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Specify the
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<inlineequation><mml:math><mml:mi mathvariant="italic">x</mml:mi></mml:math></inlineequation>,
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<inlineequation><mml:math><mml:mi mathvariant="italic">y</mml:mi></mml:math></inlineequation>,
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and
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<inlineequation><mml:math><mml:mi mathvariant="italic">z</mml:mi></mml:math></inlineequation>
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coordinates of the new current normal.
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The initial value of the current normal is the unit vector, (0, 0, 1).
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</para>
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<para>
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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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<refsynopsisdiv><title>C Specification</title>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glNormal3bv</function></funcdef>
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<paramdef>const GLbyte * <parameter>v</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glNormal3dv</function></funcdef>
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<paramdef>const GLdouble * <parameter>v</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glNormal3fv</function></funcdef>
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<paramdef>const GLfloat * <parameter>v</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glNormal3iv</function></funcdef>
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<paramdef>const GLint * <parameter>v</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glNormal3sv</function></funcdef>
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<paramdef>const GLshort * <parameter>v</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1 id="parameters2"><title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><parameter>v</parameter></term>
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<listitem>
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<para>
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Specifies a pointer to an array of three elements:
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the
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<inlineequation><mml:math><mml:mi mathvariant="italic">x</mml:mi></mml:math></inlineequation>,
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<inlineequation><mml:math><mml:mi mathvariant="italic">y</mml:mi></mml:math></inlineequation>,
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and
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<inlineequation><mml:math><mml:mi mathvariant="italic">z</mml:mi></mml:math></inlineequation>
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coordinates of the new current normal.
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</para>
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<para>
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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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The current normal is set to the given coordinates
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whenever <function>glNormal</function> is issued.
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Byte, short, or integer arguments are converted to floating-point
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format with a linear mapping that maps the most positive representable integer
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value to 1.0
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and the most negative representable integer value to
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<inlineequation><mml:math>
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<!-- eqn: -1.0:-->
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<mml:mn>-1.0</mml:mn>
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</mml:math></inlineequation>.
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</para>
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<para>
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Normals specified with <function>glNormal</function> need not have unit length.
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If <constant>GL_NORMALIZE</constant> is enabled,
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then normals of any length specified with <function>glNormal</function> are normalized after transformation.
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If <constant>GL_RESCALE_NORMAL</constant> is enabled, normals are scaled by a scaling factor
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derived from the modelview matrix. <constant>GL_RESCALE_NORMAL</constant> requires that the
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originally specified normals were of unit length, and that the modelview
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matrix contain only uniform scales for proper results.
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To enable and disable normalization, call <citerefentry><refentrytitle>glEnable</refentrytitle></citerefentry> and <citerefentry><refentrytitle>glDisable</refentrytitle></citerefentry>
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with either <constant>GL_NORMALIZE</constant> or <constant>GL_RESCALE_NORMAL</constant>.
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Normalization is initially disabled.
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</para>
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</refsect1>
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<refsect1 id="notes"><title>Notes</title>
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<para>
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The current normal can be updated at any time.
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In particular, <function>glNormal</function> can be called between a call to <citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry> and
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the corresponding call to <citerefentry><refentrytitle>glEnd</refentrytitle></citerefentry>.
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</para>
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</refsect1>
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<refsect1 id="associatedgets"><title>Associated Gets</title>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_CURRENT_NORMAL</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glIsEnabled</refentrytitle></citerefentry> with argument <constant>GL_NORMALIZE</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glIsEnabled</refentrytitle></citerefentry> with argument <constant>GL_RESCALE_NORMAL</constant>
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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>glBegin</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glColor</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glIndex</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glMultiTexCoord</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glNormalPointer</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexCoord</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glVertex</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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