'\" e
'\"macro stdmacro
.ds Vn Version 1.2
.ds Dt 24 September 1999
.ds Re Release 1.2.1
.ds Dp May 22 14:45
.ds Dm 0 May 22 14:
.ds Xs 32571 5
.TH GLLOADMATRIX 3G
.SH NAME
.B "glLoadMatrixd, glLoadMatrixf
\- replace the current matrix with the specified matrix
.SH C SPECIFICATION
void \f3glLoadMatrixd\fP(
const GLdouble \fI*m\fP )
.nf
.fi
void \f3glLoadMatrixf\fP(
const GLfloat \fI*m\fP )
.nf
.fi
.EQ
delim $$
.EN
.SH PARAMETERS
.TP \w'\f2m\fP\ \ 'u
\f2m\fP
Specifies a pointer to 16 consecutive values, which are used as the
elements of a $4 ~times~ 4$ column-major matrix.
.SH DESCRIPTION
\%\f3glLoadMatrix\fP replaces the current matrix with the one whose elements are specified by
\f2m\fP.
The current matrix is the projection matrix,
modelview matrix,
or texture matrix,
depending on the current matrix mode
(see \%\f3glMatrixMode\fP).
.P
The current matrix, M, defines a transformation of coordinates.
For instance, assume M refers to the modelview matrix.
If $v ~=~ (v[0], v[1], v[2], v[3])$ is the set of object coordinates
of a vertex,
and \f2m\fP points to an array of $16$
single- or double-precision
floating-point values $m[0], m[1],. . .,m[15]$,
then the modelview transformation $M(v)$ does the following:
.P
.ce
.EQ
down 130
{M(v) ~ = ~
{{ left ( matrix {
ccol { ~m[0] above m[1] above m[2] above m[3] ~}
ccol { ~m[4] above m[5] above m[6] above m[7] ~}
ccol { ~m[8] above m[9] above m[10] above m[11] ~}
ccol { ~m[12]~ above m[13]~ above m[14]~ above m[15]~}
} right ) } ~~ times ~~
{left ( matrix {
ccol { ~v[0]~ above ~v[1]~ above ~v[2]~ above ~v[3]~ }
} right )} }}
.EN
.sp
.P
Where ``$times$'' denotes matrix multiplication.
.P
Projection and texture transformations are similarly defined.
.SH NOTES
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.
.SH ERRORS
\%\f3GL_INVALID_OPERATION\fP is generated if \%\f3glLoadMatrix\fP
is executed between the execution of \%\f3glBegin\fP
and the corresponding execution of \%\f3glEnd\fP.
.SH ASSOCIATED GETS
\%\f3glGet\fP with argument \%\f3GL_MATRIX_MODE\fP
.br
\%\f3glGet\fP with argument \%\f3GL_COLOR_MATRIX\fP
.br
\%\f3glGet\fP with argument \%\f3GL_MODELVIEW_MATRIX\fP
.br
\%\f3glGet\fP with argument \%\f3GL_PROJECTION_MATRIX\fP
.br
\%\f3glGet\fP with argument \%\f3GL_TEXTURE_MATRIX\fP
.SH SEE ALSO
\%\f3glLoadIdentity\fP,
\%\f3glMatrixMode\fP,
\%\f3glMultMatrix\fP,
\%\f3glPushMatrix\fP