OpenGL Materials
GLfloat white8[] = {.8, .8, .8, 1.}, white2 = {.2,.2,.2,1.},black={0.,0.,0.};
GLfloat mat_shininess[] = {50.}; /* Phong exponent */
glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, black);
glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, white8);
glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, white2);
glMaterialfv(GL_FRONT_AND_BACK, GL_SHININESS, mat_shininess);