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  Date : 2006-11-29 17:00:35
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  Message : OpenGL manual pages from monolithic tree.

• doc/gl-docs/GL/gl/multmatrix.3gl

• '\" e
  '\"! eqn | mmdoc
  '\"macro stdmacro
  .ds Vn Version 1.2
  .ds Dt 24 September 1999
  .ds Re Release 1.2.1
  .ds Dp Jan 14 18:30
  .ds Dm 01 multmatri
  .ds Xs 32348 6 multmatrix.gl
  .TH GLMULTMATRIX 3G
  .SH NAME
  .B "glMultMatrixd, glMultMatrixf
  \- multiply the current matrix with the specified matrix
  
  .SH C SPECIFICATION
  void \f3glMultMatrixd\fP(
  const GLdouble \fI*m\fP )
  .nf
  .fi
  void \f3glMultMatrixf\fP(
  const GLfloat \fI*m\fP )
  .nf
  .fi
  
  .EQ
  delim $$
  .EN
  .SH PARAMETERS
  .TP \w'\f2m\fP\ \ 'u 
  \f2m\fP
  Points to 16 consecutive values that are used as the elements of 
  a $4 ~times~ 4$ column-major matrix. 
  .SH DESCRIPTION
  \%\f3glMultMatrix\fP multiplies the current matrix with the one specified using \f2m\fP, and
  replaces the current matrix with the product.
  .P
  The current matrix is determined by the current matrix mode (see \%\f3glMatrixMode\fP). It is either the projection matrix,
  modelview matrix,
  or the texture matrix.
  .SH 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 $C ~times~ v$, or
  .sp
  .ce
  .EQ
  down 130
  {{ left (  matrix {
     ccol { c[0] above c[1] above c[2] above c[3] }
     ccol { c[4] above c[5] above c[6] above c[7] }
     ccol { c[8] above c[9] above c[10] above c[11] }
     ccol { c[12]~ above c[13]~ above c[14]~ above c[15]~ }
  } right ) } ~~ times ~~
  {left ( matrix {
  ccol { v[0]~ above v[1]~ above v[2]~ above v[3]~ }
  } right )} }
  .EN
  .sp
  .P
  Calling \%\f3glMultMatrix\fP with an argument of $"m" ~=~ m[0], m[1], ..., m[15]$ 
  replaces the current transformation with $(C ~times~ M) ~times~ v$,
  or
  .sp
  .ce
  .EQ
  down 130
  {{ left (  matrix {
     ccol { c[0] above c[1] above c[2] above c[3] }
     ccol { c[4] above c[5] above c[6] above c[7] }
     ccol { c[8] above c[9] above c[10] above c[11] }
     ccol { c[12]~ above c[13]~ above c[14]~ above c[15]~ }
  } right ) } ~~ times ~~
  { left (  matrix {
     ccol { m[0] above m[1] above m[2] above m[3] }
     ccol { m[4] above m[5] above m[6] above m[7] }
     ccol { m[8] above m[9] above m[10] above m[11] }
     ccol { m[12]~ above m[13]~ above m[14]~ above m[15]~ }
  } right ) } ~~ times ~~
  {left ( matrix {
  ccol { v[0]~ above v[1]~ above v[2]~ above v[3]~ }
  } right )} }
  .EN
  .sp
  .P
  Where '$times$' denotes matrix multiplication, and
  $v$ is represented as a $4 ~times~ 1$ matrix. 
  .br
  .SH 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.
  .P
  In many computer languages $4 ~times~ 4$ 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 \%\f3glMultMatrix\fP 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.
  .SH ERRORS
  \%\f3GL_INVALID_OPERATION\fP is generated if \%\f3glMultMatrix\fP
  is executed between the execution of \%\f3glBegin\fP
  and the corresponding execution of \%\f3glEnd\fP.
  .SH ASSOCIATED GETS
  \%\f3glGet\fP with argument \%\f3GL_MATRIX_MODE\fP
  .br
  \%\f3glGet\fP with argument \%\f3GL_COLOR_MATRIX\fP
  .br
  \%\f3glGet\fP with argument \%\f3GL_MODELVIEW_MATRIX\fP
  .br
  \%\f3glGet\fP with argument \%\f3GL_PROJECTION_MATRIX\fP
  .br
  \%\f3glGet\fP with argument \%\f3GL_TEXTURE_MATRIX\fP
  .SH SEE ALSO
  \%\f3glLoadIdentity(3G)\fP,
  \%\f3glLoadMatrix(3G)\fP,
  \%\f3glMatrixMode(3G)\fP,
  \%\f3glPushMatrix(3G)\fP