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.TH "SCALE 3" 3P "29 February 1991"
.SH NAME
SCALE 3 \- calculate a \s-2\&3D\s+2 transformation matrix to perform a specified
scaling
.IX "Transformation Matrix" "SCALE 3"
.SH SYNOPSIS
.SS C Syntax
.ft B
.ta 1.25i 3i
.nf
void
pscale3 ( scale_vector, error_ind, m)
Pvec3	*scale_vector;	\fIscale factor vector\fP
Pint	*error_ind;	\fI\s-2OUT\s+2 error indicator\fP
Pmatrix3	m;	\fI\s-2OUT\s+2 transformation matrix\fP
.fi
.ft R
.SS Required PHIGS Operating States
(PHOP, *, *, *)
.SH DESCRIPTION
.SS Purpose
Use \s-2SCALE 3\s+2 to generate a \s-2\&3D\s+2 homogeneous
(4\ \(mu\ 4) transformation
matrix that performs a \s-2\&3D\s+2 scaling.
.LP
The returned matrix can be passed as an argument to
\s-2SET LOCAL TRANSFORMATION 3\s+2 or \s-2SET GLOBAL TRANSFORMATION 3\s+2
to modify the modelling transformation that is
applied to output primitives during traversal.
.SS C Input Parameter
.IP \fIscale_vector\fP
A pointer to a Pvec3 data structure containing the scale factors to be
applied to the \fIx\fP, \fIy\fP, and \fIz\fP dimensions.
Pvec3 is defined in phigs.h as follows:
.sp .4
.ta .5i +\w'Pfloat	'u +\w'delta_x;		'u
.nf
typedef struct  {
.sp .2
	Pfloat	delta_x;	/* x coordinate */
	Pfloat	delta_y;	/* y coordinate */
	Pfloat	delta_z;	/* z coordinate */
.sp .2
} Pvec3;
.fi
.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 4\ \(mu\ 4 homogeneous transformation matrix that performs the specified
scaling.
Pmatrix3 is defined in phigs.h as follows:
.IP
typedef  Pfloat  Pmatrix3[4][4];
.SS Execution
\s-2SCALE 3\s+2 returns a \s-2\&3D\s+2 homogeneous (4\ \(mu\ 4) transformation matrix
that performs the scaling specified by \fIscale factor vector\fP.
The scaling is relative to the origin of the current modelling
coordinate system.
.LP
The \fIscale factor vector\fP specifies
\fIsx\fP, \fIsy\fP, and \fIsz\fP
scaling factors that control scaling in the
\fIx\fP, \fIy\fP, and \fIz\fP
directions.
.SH ERRORS
.IP 002
Ignoring function, function requires state (\s-2PHOP, *, *, *\s+2)
.SH SEE ALSO
.nf
.IP
.ta 0.5i
.SM "SET LOCAL TRANSFORMATION 3 (3P)"
.SM "BUILD TRANSFORMATION MATRIX 3 (3P)"
.SM "COMPOSE MATRIX 3 (3P)"
.SM "SCALE (3P)"
.SM "TRANSFORM POINT 3 (3P)"
.fi