'\" 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 scale.gl
.ds Xs 39478 4 scale.gl
.TH GLSCALE 3G
.SH NAME
.B "glScaled, glScalef
\- multiply the current matrix by a general scaling matrix
.SH C SPECIFICATION
void \f3glScaled\fP(
GLdouble \fIx\fP,
.nf
.ta \w'\f3void \fPglScaled( 'u
GLdouble \fIy\fP,
GLdouble \fIz\fP )
.fi
void \f3glScalef\fP(
GLfloat \fIx\fP,
.nf
.ta \w'\f3void \fPglScalef( 'u
GLfloat \fIy\fP,
GLfloat \fIz\fP )
.fi
.EQ
delim $$
.EN
.SH PARAMETERS
.TP \w'\f2x\fP\ \f2y\fP\ \f2z\fP\ \ 'u
\f2x\fP, \f2y\fP, \f2z\fP
Specify scale factors along the \f2x\fP, \f2y\fP, and \f2z\fP axes, respectively.
.SH DESCRIPTION
\%\f3glScale\fP produces a nonuniform scaling along the \f2x\fP, \f2y\fP, and
\f2z\fP axes.
The three parameters indicate the desired scale factor along
each of the three axes.
.P
The current matrix
(see \%\f3glMatrixMode\fP)
is multiplied by this scale matrix,
and the product replaces the current matrix
as if \%\f3glScale\fP were called with the following matrix
as its argument:
.P
.ce
.EQ
left ( ~ down 20 matrix {
ccol { ~"x" above ~0 above ~0 above ~0 }
ccol { ~0 above ~"y" above ~0 above ~0 }
ccol { ~0 above ~0 above ~"z" above ~0 }
ccol { ~0 above ~0 above ~0 above ~1}
} ~~ right )
.EN
.sp
If the matrix mode is either \%\f3GL_MODELVIEW\fP or \%\f3GL_PROJECTION\fP,
all objects drawn after \%\f3glScale\fP is called are scaled.
.P
Use \%\f3glPushMatrix\fP and \%\f3glPopMatrix\fP to save and restore
the unscaled coordinate system.
.SH NOTES
If scale factors other than 1 are applied to the modelview matrix
and lighting is enabled, lighting often appears wrong.
In that case, enable automatic normalization of normals by
calling \%\f3glEnable\fP with the argument \%\f3GL_NORMALIZE\fP.
.SH ERRORS
\%\f3GL_INVALID_OPERATION\fP is generated if \%\f3glScale\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
\%\f3glMatrixMode(3G)\fP,
\%\f3glMultMatrix(3G)\fP,
\%\f3glPushMatrix(3G)\fP,
\%\f3glRotate(3G)\fP,
\%\f3glTranslate(3G)\fP