.\" Copyright (c) 1994 The Board of Trustees of The Leland Stanford
.\" Junior University.  All rights reserved.
.\" 
.\" Permission to use, copy, modify and distribute this software and its
.\" documentation for any purpose is hereby granted without fee, provided
.\" that the above copyright notice and this permission notice appear in
.\" all copies of this software and that you do not sell the software.
.\" Commercial licensing is available by contacting the author.
.\" 
.\" THE SOFTWARE IS PROVIDED "AS IS" AND WITHOUT WARRANTY OF ANY KIND,
.\" EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
.\" WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
.\" 
.\" Author:
.\"    Phil Lacroute
.\"    Computer Systems Laboratory
.\"    Electrical Engineering Dept.
.\"    Stanford University
.\" 
.\" $Date: 1994/12/31 19:49:53 $
.\" $Revision: 1.1 $
.\"
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.TH vpMultMatrix 3 "" VolPack
.SH NAME
vpMultMatrix \- multiply the current transformation matrix by another
matrix
.SH SYNOPSIS
#include <volpack.h>
.sp
.FS vpResult
\fBvpMultMatrix(\fIvpc, m\fB)\fR
.FA
vpContext *\fIvpc;\fR
.FA
vpMatrix4 \fIm;\fR
.FE
.SH ARGUMENTS
.IP \fIvpc\fR
VolPack context from \fBvpCreateContext.\fR
.IP \fIm\fR
Input matrix.
.SH DESCRIPTION
\fBvpMultMatrix\fR is used to multiply the current transformation
matrix by an arbitrary 4-by-4 transformation matrix.  Use
\fBvpCurrentMatrix\fR to set the current transformation matrix.  By
default, the matrix is post-multiplied (N = N*\fIm\fR where N is
the current matrix and \fIm\fR is the argument to \fBvpMultMatrix\fR).  The
VP_CONCAT_MODE option to \fBvpSeti\fR can be used to select
pre-multiplication.
.SH "STATE VARIABLES"
The current matrix concatenation parameters can be retrieved with the
following state variable codes (see vpGeti(3)): VP_CURRENT_MATRIX,
VP_CONCAT_MODE.
.SH ERRORS
The return value is always VP_OK.
.SH SEE ALSO
VolPack(3), vpCreateContext(3), vpCurrentMatrix(3)