<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "xhtml1-transitional.dtd"><!-- saved from url=(0013)about:internet -->
<?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>glLoadMatrix</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1" /></head><body><div class="refentry"><a id="glLoadMatrix"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glLoadMatrix — replace the current matrix with the specified matrix</p></div><div class="refsynopsisdiv"><h2>C Specification</h2><div class="funcsynopsis"><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">void <strong class="fsfunc">glLoadMatrixd</strong>(</code></td><td>const GLdouble * <var class="pdparam">m</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div><div class="funcsynopsis"><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">void <strong class="fsfunc">glLoadMatrixf</strong>(</code></td><td>const GLfloat * <var class="pdparam">m</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a id="parameters"></a><h2>Parameters</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>m</code></em></span></dt><dd><p>
                    Specifies a pointer to 16 consecutive values, which are used as the
                    elements of a 
                    <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
                        
                        <mml:mrow>
                            <mml:mn>4</mml:mn>
                            <mml:mo>×</mml:mo>
                            <mml:mn>4</mml:mn>
                        </mml:mrow>
                    </mml:math>
                    column-major matrix.
                </p></dd></dl></div></div><div class="refsect1"><a id="description"></a><h2>Description</h2><p>
            <code class="function">glLoadMatrix</code> replaces the current matrix with the one whose elements are specified by
            <em class="parameter"><code>m</code></em>.
            The current matrix is the projection matrix,
            modelview matrix,
            or texture matrix,
            depending on the current matrix mode
            (see <a class="citerefentry" href="glMatrixMode.xml"><span class="citerefentry"><span class="refentrytitle">glMatrixMode</span></span></a>).
        </p><p>
            The current matrix, M, defines a transformation of coordinates.
            For instance, assume M refers to the modelview matrix.
            If  
            <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
                
                <mml:mrow>
                    <mml:mi mathvariant="italic">v</mml:mi>
                    <mml:mo>=</mml:mo>
                    <mml:mfenced open="(" close=")">
                        <mml:mrow>
                            <mml:mi mathvariant="italic">v</mml:mi>
                            <mml:mo>⁡</mml:mo>
                            <mml:mfenced open="[" close="]">
                                <mml:mn>0</mml:mn>
                            </mml:mfenced>
                        </mml:mrow>
                        <mml:mrow>
                            <mml:mi mathvariant="italic">v</mml:mi>
                            <mml:mo>⁡</mml:mo>
                            <mml:mfenced open="[" close="]">
                                <mml:mn>1</mml:mn>
                            </mml:mfenced>
                        </mml:mrow>
                        <mml:mrow>
                            <mml:mi mathvariant="italic">v</mml:mi>
                            <mml:mo>⁡</mml:mo>
                            <mml:mfenced open="[" close="]">
                                <mml:mn>2</mml:mn>
                            </mml:mfenced>
                        </mml:mrow>
                        <mml:mrow>
                            <mml:mi mathvariant="italic">v</mml:mi>
                            <mml:mo>⁡</mml:mo>
                            <mml:mfenced open="[" close="]">
                                <mml:mn>3</mml:mn>
                            </mml:mfenced>
                        </mml:mrow>
                    </mml:mfenced>
                </mml:mrow>
            </mml:math>
            is the set of object coordinates
            of a vertex,
            and <em class="parameter"><code>m</code></em> points to an array of 
            <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
                
                <mml:mn>16</mml:mn>
            </mml:math>
            single- or double-precision
            floating-point values 
            <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
                
                <mml:mrow>
                    <mml:mi mathvariant="italic">m</mml:mi>
                    <mml:mo>=</mml:mo>
                    <mml:mfenced open="{" close="}">
                        <mml:mrow>
                            <mml:mi mathvariant="italic">m</mml:mi>
                            <mml:mo>⁡</mml:mo>
                            <mml:mfenced open="[" close="]">
                                <mml:mn>0</mml:mn>
                            </mml:mfenced>
                        </mml:mrow>
                        <mml:mrow>
                            <mml:mi mathvariant="italic">m</mml:mi>
                            <mml:mo>⁡</mml:mo>
                            <mml:mfenced open="[" close="]">
                                <mml:mn>1</mml:mn>
                            </mml:mfenced>
                        </mml:mrow>
                        <mml:mi mathvariant="italic">...</mml:mi>
                        <mml:mrow>
                            <mml:mi mathvariant="italic">m</mml:mi>
                            <mml:mo>⁡</mml:mo>
                            <mml:mfenced open="[" close="]">
                                <mml:mn>15</mml:mn>
                            </mml:mfenced>
                        </mml:mrow>
                    </mml:mfenced>
                </mml:mrow>
            </mml:math>,
            then the modelview transformation 
            <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
                
                <mml:mrow>
                    <mml:mi mathvariant="italic">M</mml:mi>
                    <mml:mo>⁡</mml:mo>
                    <mml:mfenced open="(" close=")">
                        <mml:mi mathvariant="italic">v</mml:mi>
                    </mml:mfenced>
                </mml:mrow>
            </mml:math>
            does the following:
        </p><p>
            </p><div class="informalequation"><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
                
                <mml:mrow>
                    <mml:mrow>
                        <mml:mi mathvariant="italic">M</mml:mi>
                        <mml:mo>⁡</mml:mo>
                        <mml:mfenced open="(" close=")">
                            <mml:mi mathvariant="italic">v</mml:mi>
                        </mml:mfenced>
                    </mml:mrow>
                    <mml:mo>=</mml:mo>
                    <mml:mrow>
                        <mml:mfenced open="(" close=")">
                            <mml:mtable>
                                <mml:mtr>
                                    <mml:mtd>
                                        <mml:mrow>
                                            <mml:mi mathvariant="italic">m</mml:mi>
                                            <mml:mo>⁡</mml:mo>
                                            <mml:mfenced open="[" close="]">
                                                <mml:mn>0</mml:mn>
                                            </mml:mfenced>
                                        </mml:mrow>
                                    </mml:mtd>
                                    <mml:mtd>
                                        <mml:mrow>
                                            <mml:mi mathvariant="italic">m</mml:mi>
                                            <mml:mo>⁡</mml:mo>
                                            <mml:mfenced open="[" close="]">
                                                <mml:mn>4</mml:mn>
                                            </mml:mfenced>
                                        </mml:mrow>
                                    </mml:mtd>
                                    <mml:mtd>
                                        <mml:mrow>
                                            <mml:mi mathvariant="italic">m</mml:mi>
                                            <mml:mo>⁡</mml:mo>
                                            <mml:mfenced open="[" close="]">
                                                <mml:mn>8</mml:mn>
                                            </mml:mfenced>
                                        </mml:mrow>
                                    </mml:mtd>
                                    <mml:mtd>
                                        <mml:mrow>
                                            <mml:mi mathvariant="italic">m</mml:mi>
                                            <mml:mo>⁡</mml:mo>
                                            <mml:mfenced open="[" close="]">
                                                <mml:mn>12</mml:mn>
                                            </mml:mfenced>
                                        </mml:mrow>
                                    </mml:mtd>
                                </mml:mtr>
                                <mml:mtr>
                                    <mml:mtd>
                                        <mml:mrow>
                                            <mml:mi mathvariant="italic">m</mml:mi>
                                            <mml:mo>⁡</mml:mo>
                                            <mml:mfenced open="[" close="]">
                                                <mml:mn>1</mml:mn>
                                            </mml:mfenced>
                                        </mml:mrow>
                                    </mml:mtd>
                                    <mml:mtd>
                                        <mml:mrow>
                                            <mml:mi mathvariant="italic">m</mml:mi>
                                            <mml:mo>⁡</mml:mo>
                                            <mml:mfenced open="[" close="]">
                                                <mml:mn>5</mml:mn>
                                            </mml:mfenced>
                                        </mml:mrow>
                                    </mml:mtd>
                                    <mml:mtd>
                                        <mml:mrow>
                                            <mml:mi mathvariant="italic">m</mml:mi>
                                            <mml:mo>⁡</mml:mo>
                                            <mml:mfenced open="[" close="]">
                                                <mml:mn>9</mml:mn>
                                            </mml:mfenced>
                                        </mml:mrow>
                                    </mml:mtd>
                                    <mml:mtd>
                                        <mml:mrow>
                                            <mml:mi mathvariant="italic">m</mml:mi>
                                            <mml:mo>⁡</mml:mo>
                                            <mml:mfenced open="[" close="]">
                                                <mml:mn>13</mml:mn>
                                            </mml:mfenced>
                                        </mml:mrow>
                                    </mml:mtd>
                                </mml:mtr>
                                <mml:mtr>
                                    <mml:mtd>
                                        <mml:mrow>
                                            <mml:mi mathvariant="italic">m</mml:mi>
                                            <mml:mo>⁡</mml:mo>
                                            <mml:mfenced open="[" close="]">
                                                <mml:mn>2</mml:mn>
                                            </mml:mfenced>
                                        </mml:mrow>
                                    </mml:mtd>
                                    <mml:mtd>
                                        <mml:mrow>
                                            <mml:mi mathvariant="italic">m</mml:mi>
                                            <mml:mo>⁡</mml:mo>
                                            <mml:mfenced open="[" close="]">
                                                <mml:mn>6</mml:mn>
                                            </mml:mfenced>
                                        </mml:mrow>
                                    </mml:mtd>
                                    <mml:mtd>
                                        <mml:mrow>
                                            <mml:mi mathvariant="italic">m</mml:mi>
                                            <mml:mo>⁡</mml:mo>
                                            <mml:mfenced open="[" close="]">
                                                <mml:mn>10</mml:mn>
                                            </mml:mfenced>
                                        </mml:mrow>
                                    </mml:mtd>
                                    <mml:mtd>
                                        <mml:mrow>
                                            <mml:mi mathvariant="italic">m</mml:mi>
                                            <mml:mo>⁡</mml:mo>
                                            <mml:mfenced open="[" close="]">
                                                <mml:mn>14</mml:mn>
                                            </mml:mfenced>
                                        </mml:mrow>
                                    </mml:mtd>
                                </mml:mtr>
                                <mml:mtr>
                                    <mml:mtd>
                                        <mml:mrow>
                                            <mml:mi mathvariant="italic">m</mml:mi>
                                            <mml:mo>⁡</mml:mo>
                                            <mml:mfenced open="[" close="]">
                                                <mml:mn>3</mml:mn>
                                            </mml:mfenced>
                                        </mml:mrow>
                                    </mml:mtd>
                                    <mml:mtd>
                                        <mml:mrow>
                                            <mml:mi mathvariant="italic">m</mml:mi>
                                            <mml:mo>⁡</mml:mo>
                                            <mml:mfenced open="[" close="]">
                                                <mml:mn>7</mml:mn>
                                            </mml:mfenced>
                                        </mml:mrow>
                                    </mml:mtd>
                                    <mml:mtd>
                                        <mml:mrow>
                                            <mml:mi mathvariant="italic">m</mml:mi>
                                            <mml:mo>⁡</mml:mo>
                                            <mml:mfenced open="[" close="]">
                                                <mml:mn>11</mml:mn>
                                            </mml:mfenced>
                                        </mml:mrow>
                                    </mml:mtd>
                                    <mml:mtd>
                                        <mml:mrow>
                                            <mml:mi mathvariant="italic">m</mml:mi>
                                            <mml:mo>⁡</mml:mo>
                                            <mml:mfenced open="[" close="]">
                                                <mml:mn>15</mml:mn>
                                            </mml:mfenced>
                                        </mml:mrow>
                                    </mml:mtd>
                                </mml:mtr>
                            </mml:mtable>
                        </mml:mfenced>
                        <mml:mo>×</mml:mo>
                        <mml:mfenced open="(" close=")">
                            <mml:mtable>
                                <mml:mtr>
                                    <mml:mtd>
                                        <mml:mrow>
                                            <mml:mi mathvariant="italic">v</mml:mi>
                                            <mml:mo>⁡</mml:mo>
                                            <mml:mfenced open="[" close="]">
                                                <mml:mn>0</mml:mn>
                                            </mml:mfenced>
                                        </mml:mrow>
                                    </mml:mtd>
                                </mml:mtr>
                                <mml:mtr>
                                    <mml:mtd>
                                        <mml:mrow>
                                            <mml:mi mathvariant="italic">v</mml:mi>
                                            <mml:mo>⁡</mml:mo>
                                            <mml:mfenced open="[" close="]">
                                                <mml:mn>1</mml:mn>
                                            </mml:mfenced>
                                        </mml:mrow>
                                    </mml:mtd>
                                </mml:mtr>
                                <mml:mtr>
                                    <mml:mtd>
                                        <mml:mrow>
                                            <mml:mi mathvariant="italic">v</mml:mi>
                                            <mml:mo>⁡</mml:mo>
                                            <mml:mfenced open="[" close="]">
                                                <mml:mn>2</mml:mn>
                                            </mml:mfenced>
                                        </mml:mrow>
                                    </mml:mtd>
                                </mml:mtr>
                                <mml:mtr>
                                    <mml:mtd>
                                        <mml:mrow>
                                            <mml:mi mathvariant="italic">v</mml:mi>
                                            <mml:mo>⁡</mml:mo>
                                            <mml:mfenced open="[" close="]">
                                                <mml:mn>3</mml:mn>
                                            </mml:mfenced>
                                        </mml:mrow>
                                    </mml:mtd>
                                </mml:mtr>
                            </mml:mtable>
                        </mml:mfenced>
                    </mml:mrow>
                </mml:mrow>
            </mml:math></div><p>
        </p><p>
        </p><p>
            Projection and texture transformations are similarly defined.
        </p></div><div class="refsect1"><a id="notes"></a><h2>Notes</h2><p>
            While the elements of the matrix may be specified with
            single or double precision, the GL implementation may
            store or operate on these values in less than single
            precision.
        </p></div><div class="refsect1"><a id="errors"></a><h2>Errors</h2><p>
            <code class="constant">GL_INVALID_OPERATION</code> is generated if <code class="function">glLoadMatrix</code>
            is executed between the execution of <a class="citerefentry" href="glBegin.xml"><span class="citerefentry"><span class="refentrytitle">glBegin</span></span></a>
            and the corresponding execution of <a class="citerefentry" href="glEnd.xml"><span class="citerefentry"><span class="refentrytitle">glEnd</span></span></a>.
        </p></div><div class="refsect1"><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_MATRIX_MODE</code>
        </p><p>
            <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_COLOR_MATRIX</code>
        </p><p>
            <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_MODELVIEW_MATRIX</code>
        </p><p>
            <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_PROJECTION_MATRIX</code>
        </p><p>
            <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_TEXTURE_MATRIX</code>
        </p></div><div class="refsect1"><a id="seealso"></a><h2>See Also</h2><p>
            <a class="citerefentry" href="glLoadIdentity.xml"><span class="citerefentry"><span class="refentrytitle">glLoadIdentity</span></span></a>,
            <a class="citerefentry" href="glMatrixMode.xml"><span class="citerefentry"><span class="refentrytitle">glMatrixMode</span></span></a>,
            <a class="citerefentry" href="glMultMatrix.xml"><span class="citerefentry"><span class="refentrytitle">glMultMatrix</span></span></a>,
            <a class="citerefentry" href="glMultTransposeMatrix.xml"><span class="citerefentry"><span class="refentrytitle">glMultTransposeMatrix</span></span></a>,
            <a class="citerefentry" href="glPushMatrix.xml"><span class="citerefentry"><span class="refentrytitle">glPushMatrix</span></span></a>
        </p></div><div class="refsect1"><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>