nFactor

Value that indicates the factor to be applied in the function operation specified in the Flag parameter. This parameter is used only if Flag is GL_EXP, GL_SIGMOID or GL_LN. If GL_EXP or GL_SIGMOID is set in Flag the value of this parameter can be any integer (+/-). If GL_LN flag is set, its value should be >= 0. However, if nFactor = 0 the lookup table will be filled linearly from nStart to nEnd, regardless of the value set in Flag.