Im trying to put in portals nto my OGL app. in drawGLScene() i setup the camera witj rot and translatees then.. for(i=0;i<max;i++) { if(quad==portal) make viewing frustrum to fit the quad and render else just render quad. } is this correct also how do i do the frustrum fitting the quad thing? thanks

This is exactly what I am trying to understand about portals.

^^^^^^^^^