1991-2006 Silicon Graphics, Inc.
glNormal 3G
glNormal set the current normal vector

## C Specification

void `glNormal3b` GLbyte nx GLbyte ny GLbyte nz void `glNormal3d` GLdouble nx GLdouble ny GLdouble nz void `glNormal3f` GLfloat nx GLfloat ny GLfloat nz void `glNormal3i` GLint nx GLint ny GLint nz void `glNormal3s` GLshort nx GLshort ny GLshort nz

## Parameters

nx
ny
nz

  Specify the x, y, and z coordinates of the new current normal. The initial value of the current normal is the unit vector, (0, 0, 1).

## C Specification

void `glNormal3bv` const GLbyte * v void `glNormal3dv` const GLdouble * v void `glNormal3fv` const GLfloat * v void `glNormal3iv` const GLint * v void `glNormal3sv` const GLshort * v

## Parameters

v

  Specifies a pointer to an array of three elements: the x, y, and z coordinates of the new current normal.

## Description

The current normal is set to the given coordinates whenever `glNormal` is issued. Byte, short, or integer arguments are converted to floating-point format with a linear mapping that maps the most positive representable integer value to 1.0 and the most negative representable integer value to -1.0 .

Normals specified with `glNormal` need not have unit length. If `GL_NORMALIZE` is enabled, then normals of any length specified with `glNormal` are normalized after transformation. If `GL_RESCALE_NORMAL` is enabled, normals are scaled by a scaling factor derived from the modelview matrix. `GL_RESCALE_NORMAL` requires that the originally specified normals were of unit length, and that the modelview matrix contain only uniform scales for proper results. To enable and disable normalization, call glEnable and glDisable with either `GL_NORMALIZE` or `GL_RESCALE_NORMAL`. Normalization is initially disabled.

## Notes

The current normal can be updated at any time. In particular, `glNormal` can be called between a call to glBegin and the corresponding call to glEnd.

## Associated Gets

glGet with argument `GL_CURRENT_NORMAL`

glIsEnabled with argument `GL_NORMALIZE`

glIsEnabled with argument `GL_RESCALE_NORMAL`

## See Also

glBegin, glColor, glIndex, glMultiTexCoord, glNormalPointer, glTexCoord, glVertex

## 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/.