void display() { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glLoadIdentity(); gluLookAt( 0,0,30, 0,0,0, 0,1,0); glPushMatrix(); glRotatef(g_rotation,0,1,0); g_rotation += 0.5f; obj.draw(); glPopMatrix(); glutSwapBuffers(); }