1991-2006
Silicon Graphics, Inc.
glMultTransposeMatrix
3G
glMultTransposeMatrix
multiply the current matrix with the specified row-major ordered matrix
C Specification
void glMultTransposeMatrixd
const GLdouble * m
void glMultTransposeMatrixf
const GLfloat * m
Parameters
m
Points to 16 consecutive values that are used as the elements of
a
4
×
4
row-major matrix.
Description
glMultTransposeMatrix multiplies the current matrix with the one specified using m, and
replaces the current matrix with the product.
The current matrix is determined by the current matrix mode (see
glMatrixMode). It is either the projection matrix, modelview matrix,
or the texture matrix.
Examples
If the current matrix is
C
and the coordinates
to be transformed are
v
=
v
0
v
1
v
2
v
3
,
then the current transformation is
C
×
v
,
or
c
0
c
4
c
8
c
12
c
1
c
5
c
9
c
13
c
2
c
6
c
10
c
14
c
3
c
7
c
11
c
15
×
v
0
v
1
v
2
v
3
Calling glMultTransposeMatrix with an argument of
m
16
=
m
0
m
1
...
m
15
replaces the current transformation with
C
×
M
×
v
,
or
c
0
c
4
c
8
c
12
c
1
c
5
c
9
c
13
c
2
c
6
c
10
c
14
c
3
c
7
c
11
c
15
×
m
0
m
1
m
2
m
3
m
4
m
5
m
6
m
7
m
8
m
9
m
10
m
11
m
12
m
13
m
14
m
15
×
v
0
v
1
v
2
v
3
Where
v
is represented as a
4
×
1
matrix.
Calling glMultTransposeMatrix with matrix
M
is identical in operation to
glMultMatrix with
M
T
,
where
T
represents the transpose.
Notes
glMultTransposeMatrix is available only if the GL version is 1.3 or greater.
While the elements of the matrix may be specified with
single or double precision, the GL may store or operate on these
values in less-than-single precision.
The order of the multiplication is important. For example, if the current
transformation is a rotation, and glMultTransposeMatrix is called with a translation matrix,
the translation is done directly on the coordinates to be transformed,
while the rotation is done on the results of that translation.
Errors
GL_INVALID_OPERATION is generated if glMultTransposeMatrix
is executed between the execution of glBegin
and the corresponding execution of glEnd.
Associated Gets
glGet with argument GL_MATRIX_MODE
glGet with argument GL_COLOR_MATRIX
glGet with argument GL_MODELVIEW_MATRIX
glGet with argument GL_PROJECTION_MATRIX
glGet with argument GL_TEXTURE_MATRIX
See Also
glLoadIdentity,
glLoadMatrix,
glLoadTransposeMatrix,
glMatrixMode,
glPushMatrix
Copyright
Copyright 1991-2006
Silicon Graphics, Inc. This document is licensed under the SGI
Free Software B License. For details, see
http://oss.sgi.com/projects/FreeB/.