96 lines
2.5 KiB
Plaintext
96 lines
2.5 KiB
Plaintext
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'\" e
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'\"! eqn | mmdoc
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'\"macro stdmacro
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.ds Vn Version 1.2
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.ds Dt 24 September 1999
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.ds Re Release 1.2.1
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.ds Dp Jan 14 18:30
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.ds Dm 01 loadmatri
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.ds Xs 32571 5 loadmatrix.gl
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.TH GLLOADMATRIX 3G
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.SH NAME
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.B "glLoadMatrixd, glLoadMatrixf
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\- replace the current matrix with the specified matrix
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.SH C SPECIFICATION
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void \f3glLoadMatrixd\fP(
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const GLdouble \fI*m\fP )
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.nf
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.fi
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void \f3glLoadMatrixf\fP(
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const GLfloat \fI*m\fP )
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.nf
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.fi
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.EQ
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delim $$
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.EN
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.SH PARAMETERS
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.TP \w'\f2m\fP\ \ 'u
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\f2m\fP
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Specifies a pointer to 16 consecutive values, which are used as the
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elements of a $4 ~times~ 4$ column-major matrix.
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.SH DESCRIPTION
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\%\f3glLoadMatrix\fP replaces the current matrix with the one whose elements are specified by
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\f2m\fP.
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The current matrix is the projection matrix,
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modelview matrix,
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or texture matrix,
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depending on the current matrix mode
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(see \%\f3glMatrixMode\fP).
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.P
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The current matrix, M, defines a transformation of coordinates.
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For instance, assume M refers to the modelview matrix.
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If $v ~=~ (v[0], v[1], v[2], v[3])$ is the set of object coordinates
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of a vertex,
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and \f2m\fP points to an array of $16$
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single- or double-precision
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floating-point values $m[0], m[1],. . .,m[15]$,
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then the modelview transformation $M(v)$ does the following:
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.P
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.ce
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.EQ
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down 130
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{M(v) ~ = ~
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{{ left ( matrix {
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ccol { ~m[0] above m[1] above m[2] above m[3] ~}
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ccol { ~m[4] above m[5] above m[6] above m[7] ~}
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ccol { ~m[8] above m[9] above m[10] above m[11] ~}
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ccol { ~m[12]~ above m[13]~ above m[14]~ above m[15]~}
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} right ) } ~~ times ~~
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{left ( matrix {
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ccol { ~v[0]~ above ~v[1]~ above ~v[2]~ above ~v[3]~ }
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} right )} }}
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.EN
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.sp
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.P
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Where ``$times$'' denotes matrix multiplication.
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.P
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Projection and texture transformations are similarly defined.
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.SH NOTES
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While the elements of the matrix may be specified with
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single or double precision, the GL implementation may
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store or operate on these values in less than single
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precision.
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.SH ERRORS
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\%\f3GL_INVALID_OPERATION\fP is generated if \%\f3glLoadMatrix\fP
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is executed between the execution of \%\f3glBegin\fP
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and the corresponding execution of \%\f3glEnd\fP.
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.SH ASSOCIATED GETS
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\%\f3glGet\fP with argument \%\f3GL_MATRIX_MODE\fP
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.br
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\%\f3glGet\fP with argument \%\f3GL_COLOR_MATRIX\fP
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.br
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\%\f3glGet\fP with argument \%\f3GL_MODELVIEW_MATRIX\fP
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.br
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\%\f3glGet\fP with argument \%\f3GL_PROJECTION_MATRIX\fP
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.br
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\%\f3glGet\fP with argument \%\f3GL_TEXTURE_MATRIX\fP
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.SH SEE ALSO
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\%\f3glLoadIdentity(3G)\fP,
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\%\f3glMatrixMode(3G)\fP,
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\%\f3glMultMatrix(3G)\fP,
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\%\f3glPushMatrix(3G)\fP
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