glBegin(GL_QUADS);
   glTexCoord2f(0,0);
   glVertex3d(x_0,y_0,z_0);
   glTexCoord2f(1,0);
   glVertex3d(x_1,y_1,z_1);
   glTexCoord2f(0,1);
   glVertex3d(x_2,y_2,z_2);
   glTexCoord2f(1,1);
   glVertex3d(x_3,y_3,z_3);
glEnd();