//printf("Drawing square (%f, %f), (%f, %f), (%f, %f), (%f, %f)\n", x1, z1, x1, z2, x2, z2, x2, z1);
glBegin(GL_QUADS);
glNormal3f(0,1,0);
//printf("Drawing square (%f, %f), (%f, %f), (%f, %f), (%f, %f)\n", x1, z1, x1, z2, x2, z2, x2, z1);
glBegin(GL_QUADS);
glNormal3f(0,1,0);