NAME
glScaled, glScalef
- multiply the current matrix by a general scaling matrix
C SPECIFICATION
void ggllSSccaalleedd(
GLdouble _x,
GLdouble _y,
GLdouble _z )
void ggllSSccaalleeff(
GLfloat _x,
GLfloat _y,
GLfloat _z )
delim $$
PARAMETERS
-
_x, _y, _z
-
Specify scale factors along the _x, _y, and _z axes, respectively.
DESCRIPTION
ggllSSccaallee produces a nonuniform scaling along the _x, _y, and
_z axes.
The three parameters indicate the desired scale factor along
each of the three axes.
The current matrix
(see ggllMMaattrriixxMMooddee)
is multiplied by this scale matrix,
and the product replaces the current matrix
as if ggllSSccaallee were called with the following matrix
as its argument:
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 )
If the matrix mode is either GGLL__MMOODDEELLVVIIEEWW or GGLL__PPRROOJJEECCTTIIOONN,
all objects drawn after ggllSSccaallee is called are scaled.
Use ggllPPuusshhMMaattrriixx and ggllPPooppMMaattrriixx to save and restore
the unscaled coordinate system.
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 ggllEEnnaabbllee with the argument GGLL__NNOORRMMAALLIIZZEE.
ERRORS
GGLL__IINNVVAALLIIDD__OOPPEERRAATTIIOONN is generated if ggllSSccaallee
is executed between the execution of
ggllBBeeggiinn
and the corresponding execution of ggllEEnndd.
ASSOCIATED GETS
ggllGGeett with argument GGLL__MMAATTRRIIXX__MMOODDEE
ggllGGeett with argument GGLL__CCOOLLOORR__MMAATTRRIIXX
ggllGGeett with argument GGLL__MMOODDEELLVVIIEEWW__MMAATTRRIIXX
ggllGGeett with argument GGLL__PPRROOJJEECCTTIIOONN__MMAATTRRIIXX
ggllGGeett with argument GGLL__TTEEXXTTUURREE__MMAATTRRIIXX
SEE ALSO
ggllMMaattrriixxMMooddee((33GG)),
ggllMMuullttMMaattrriixx((33GG)),
ggllPPuusshhMMaattrriixx((33GG)),
ggllRRoottaattee((33GG)),
ggllTTrraannssllaattee((33GG))