glMaterialfv(GL_FRONT_AND_BACK, GL_EMISSION, zero);
glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, zero);
glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, 0);
glMaterialfv(GL_FRONT_AND_BACK, GL_EMISSION, zero);
glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, zero);
glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, 0);