- set the current normal vector
C SPECIFICATION
PARAMETERS
_param1, _param2, _param3
Specify the x, y, and z coordi-
nates of the new current normal.
The initial value of the current
normal is the unit vector, (0, 0,
1).
C SPECIFICATION
PARAMETERS
_param1
Specifies a pointer to an array of three elements:
the x, y, and z coordinates of the new current nor-
mal.
DESCRIPTION
The current normal is set to the given coordinates when-
ever glNormal is issued. Byte, short, or integer argu-
ments are converted to floating-point
with a linear mapping that maps the most positive repre-
sentable integer value to 1.0, and the most negative rep-
resentable 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 transforma-
tion. 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. Normaliza-
tion is initially disabled.
NOTES
The current normal can be updated at any time. In partic-
ular, 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