glMultMatrix(3G)	       OpenGL Reference		      glMultMatrix(3G)

NAME    [Toc]    [Back]

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

C SPECIFICATION    [Toc]    [Back]

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

PARAMETERS    [Toc]    [Back]

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

DESCRIPTION    [Toc]    [Back]

     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    [Toc]    [Back]

     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]
		      |				|     |	    |
						   x
		      |c[2]  c[6]  c[10]  c[14]	|     |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]
      |				|     |				|     |	    |
				   x				   x
      |c[2]  c[6]  c[10]  c[14]	|     |m[2]  m[6]  m[10]  m[14]	|     |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    [Toc]    [Back]

     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.





									Page 1






glMultMatrix(3G)	       OpenGL Reference		      glMultMatrix(3G)



     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    [Toc]    [Back]

     GL_INVALID_OPERATION is generated if glMultMatrix is executed between the
     execution of glBegin and the corresponding	execution of glEnd.

ASSOCIATED GETS    [Toc]    [Back]

     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    [Toc]    [Back]

     glLoadIdentity, glLoadMatrix, glMatrixMode, glPushMatrix


									PPPPaaaaggggeeee 2222