GLfloat
light_ambient[]={0.2, 0.2, 0.2, 1.0};
GLfloat
light_diffuse[]={1.0, 1.0, 1.0, 1.0};
GLfloat
light_specular[]={0.0, 0.0, 0.0, 1.0};
glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);