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Man Pages
GLNORMAL() GLNORMAL()

glNormal3b, glNormal3d, glNormal3f, glNormal3i, glNormal3s, glNormal3bv, glNormal3dv, glNormal3fv, glNormal3iv, glNormal3sv - set the current normal vector

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 )

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).

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 )

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

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.

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.

glGet with argument GL_CURRENT_NORMAL
 
glIsEnabled with argument GL_NORMALIZE

glBegin, glColor, glIndex, glNormalPointer, glTexCoord, glVertex

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