# glmultmatrixd(3g) [centos man page]

```GLMULTMATRIX(3G)						   OpenGL Manual						  GLMULTMATRIX(3G)

NAME
glMultMatrix - multiply the current matrix with the specified matrix

C SPECIFICATION
void glMultMatrixd(const GLdouble * m);

void glMultMatrixf(const GLfloat * m);

PARAMETERS
m
Points to 16 consecutive values that are used as the elements of a 4 x 4 column-major matrix.

DESCRIPTION
glMultMatrix 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 x 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 x v  0 v  1 v  2 v  3

Calling glMultMatrix with an argument of m = m  0 m  1 ... m  15 replaces the current transformation with C x M x 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 x m  0 m  4 m  8 m  12 m  1 m  5 m  9 m  13 m  2 m  6
m  10 m	14 m  3 m  7 m	11 m  15 x v  0 v  1 v	2 v  3

Where v is represented as a 4 x 1 matrix.

NOTES
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.

In many computer languages, 4 x 4 arrays are represented in row-major order. The transformations just described represent these matrices in
column-major order. The order of the multiplication is important. For example, if the current transformation is a rotation, and
glMultMatrix 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 glMultMatrix 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

http://oss.sgi.com/projects/FreeB/.

AUTHORS
opengl.org

opengl.org							    06/10/2014							  GLMULTMATRIX(3G)```

## Check Out this Related Man Page

```GLMULTMATRIX(3G)														  GLMULTMATRIX(3G)

NAME
glMultMatrixd, glMultMatrixf - multiply the current matrix with the specified matrix

C SPECIFICATION
void glMultMatrixd( const GLdouble *m )
void glMultMatrixf( const GLfloat *m )

PARAMETERS
m  Points to 16 consecutive values that are used as the elements of a 4 x 4 column-major matrix.

DESCRIPTION
glMultMatrix 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
X v, or

c[0]  c[4]  c[8]  c[12]     v[0]
c[1]  c[5]  c[9]  c[13]     v[1]
c[2]  c[6]  c[10] c[14]  X  v[2]
c[3]  c[7]  c[11] c[15]     v[3]

Calling glMultMatrix with an argument of m = m[0], m[1], ..., m[15] replaces the current transformation with (C X M) x v, or

c[0]  c[4]  c[8]  c[12]   m[0]	m[4]  m[8]  m[12]   v[0]
c[1]  c[5]  c[9]  c[13]   m[1]	m[5]  m[9]  m[13]   v[1]
c[2]  c[6]  c[10] c[14] X m[2]	m[6]  m[10] m[14] X v[2]
c[3]  c[7]  c[11] c[15]   m[3]	m[7]  m[11] m[15]   v[3]

Where 'X' denotes matrix multiplication, and v is represented as a 4 X 1 matrix.

NOTES
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.

In many computer languages 4 X 4 arrays are represented in row-major order. The transformations just described represent these matrices	in
column-major  order.   The  order  of  the  multiplication  is  important.  For	example,  if the current transformation is a rotation, and
glMultMatrix 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 glMultMatrix 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