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.TH "COMPOSE MATRIX 3" 3P "29 February 1991"
.SH NAME
COMPOSE MATRIX 3 \- generate the composition of two homogeneous \s-2\&3D\s+2
matrices
.IX "Transformation Matrix" "COMPOSE MATRIX 3"
.SH SYNOPSIS
.SS C Syntax
.ft B
.ta 1.25i 3i
.nf
void
pcompose_matrix3 ( a, b, error_ind, m )
Pmatrix3	a;	\fImatrix a\fP
Pmatrix3	b;	\fImatrix b\fP
Pint	*error_ind;	\fI\s-2OUT\s+2 error indicator\fP
Pmatrix3	m;	\fI\s-2OUT\s+2 result matrix\fP
.fi
.ft R
.SS Required PHIGS Operating States
(PHOP, *, *, *)
.SH DESCRIPTION
.SS Purpose
Use \s-2COMPOSE MATRIX 3\s+2 to produce a \s-2\&3D\s+2
(4\ \(mu\ 4) homogeneous matrix
that is the composition (matrix multiplication product) of two specified
4\ \(mu\ 4 matrices.
.LP
The returned matrix may be passed to the \s-2SET LOCAL TRANSFORMATION 3\s+2
and \s-2SET GLOBAL TRANSFORMATION 3\s+2 functions, or to any \s-2PHIGS\s+2
function accepting a parameter of type Pmatrix3.
.SS C Input Parameters
.IP "\fIa\fP, \fIb\fP"
The \s-2\&3D\s+2 (4\ \(mu\ 4) matrices to use to calculate the composition matrix.
Matrices are specified as a Pmatrix3 array defined in phigs.h as follows:
.IP
typedef  Pfloat  Pmatrix3[4][4];
.LP
.SS C Output Parameters
.IP \fIerror_ind\fP
A pointer to the location to store the error number of any error detected
by this function.
.IP \fIm\fP
The resulting composition matrix.
.SS Execution
\s-2COMPOSE MATRIX 3\s+2 returns a \4 x\ 4 matrix that is the result of
multiplying the two specified matrices \fIa\fP and \fIb\fP:
.IP
\fIresult\fP = \fIa\fP \s-2x\s+2 \fIb\fP
.SH ERRORS
.IP 002
Ignoring function, function requires state (\s-2PHOP, *, *, *\s+2)
.SH SEE ALSO
.nf
.IP
.ta 0.5i
.SM "COMPOSE MATRIX (3P)"
.SM "COMPOSE TRANSFORMATION MATRIX 3 (3P)"
.SM "BUILD TRANSFORMATION MATRIX 3 (3P)"
.SM "SET LOCAL TRANSFORMATION 3 (3P)"
.SM "SET GLOBAL TRANSFORMATION 3 (3P)"
.fi