1991-2006
Silicon Graphics, Inc.
glScale
3G

# glScale

multiply the current matrix by a general scaling matrix

## C Specification

                    void glScaled
                    GLdouble x
                    GLdouble y
                    GLdouble z

                    void glScalef
                    GLfloat x
                    GLfloat y
                    GLfloat z

## Parameters

`x`
`y`
`z`

  Specify scale factors along the x, y, and z axes, respectively.

## Description

`glScale` 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 glMatrixMode) is multiplied by this scale matrix, and the product replaces the current matrix as if glMultMatrix were called with the following matrix as its argument:

x 0 0 0 0 y 0 0 0 0 z 0 0 0 0 1

If the matrix mode is either `GL_MODELVIEW` or `GL_PROJECTION`, all objects drawn after `glScale` is called are scaled.

Use glPushMatrix and glPopMatrix 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 glEnable with the argument `GL_NORMALIZE`.

## Errors

`GL_INVALID_OPERATION` is generated if `glScale` is executed between the execution of glBegin and the corresponding execution of glEnd.

## Associated Gets

glGet with argument `GL_MATRIX_MODE`

glGet with argument `GL_COLOR_MATRIX`

glGet with argument `GL_MODELVIEW_MATRIX`

glGet with argument `GL_PROJECTION_MATRIX`

glGet with argument `GL_TEXTURE_MATRIX`

## See Also

glMatrixMode, glMultMatrix, glPushMatrix, glRotate, glTranslate

## Copyright

Copyright 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.