glMultMatrixd, glMultMatrixf: multiply the current matrix
with the specified matrix.
C Specification 
Parameters 
Description 
Examples 
Notes 
Errors 
Associated Gets 
See Also
void glMultMatrixd(
const GLdouble *m)
void glMultMatrixf(
const GLfloat *m)
 m
 Points to 16 consecutive values that are used as the elements of a
44 columnmajor matrix.
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.
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 Cv, 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] 



Calling glMultMatrix with an argument of m =
m[0], m[1], . . ., m[15] replaces the current transformation with
(Cm )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[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] 



Where "" denotes matrix
multiplication, and v is represented as a 41 matrix.
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, 44 arrays
are represented in rowmajor order. The transformations just described
represent these matrices in columnmajor 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.
 GL_INVALID_OPERATION is generated if glMultMatrix is executed between the
execution of glBegin and the
corresponding execution of glEnd.
glGet with argument
GL_MATRIX_MODE
glGet with argument
GL_MODELVIEW_MATRIX
glGet with argument
GL_PROJECTION_MATRIX
glGet with argument
GL_TEXTURE_MATRIX
glLoadIdentity,
glLoadMatrix,
glMatrixMode,
glPushMatrix