glNormal Subroutine

OpenGL 1.2 for AIX: Reference Manual

glNormal Subroutine

Purpose

Set the current normal vector; for use in lighting calculations.

Library

OpenGL C bindings library: libGL.a

C Syntax

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)
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)

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 normalization is enabled, then normals specified with glNormal are normalized after transformation. To enable and disable normalization, call glEnable and glDisable with the argument GL_NORMALIZE. Normalization is initially disabled.

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