glmultmatrix(3g) [redhat 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 4x4 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 Cxv, or

							      c[0] c[4] c[8]  c[12]   v[0]
							     (c[1] c[5] c[9]  c[13])x(v[1])
							      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 (CxM)xv, 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])x(m[1] m[5] m[9]  m[13])x(v[1])
						  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 4x1 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 4x4 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

SEE ALSO

       glLoadIdentity(3G), glLoadMatrix(3G), glMatrixMode(3G), glPushMatrix(3G)

																  GLMULTMATRIX(3G)

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 4x4 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 Cxv, or

							      c[0] c[4] c[8]  c[12]   v[0]
							     (c[1] c[5] c[9]  c[13])x(v[1])
							      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 (CxM)xv, 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])x(m[1] m[5] m[9]  m[13])x(v[1])
						  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 4x1 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 4x4 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

SEE ALSO

       glLoadIdentity(3G), glLoadMatrix(3G), glMatrixMode(3G), glPushMatrix(3G)

																  GLMULTMATRIX(3G)