Im curious as to what others are doing
an ideal senerio would be would be able to blit the depth info from the framebuffer to another buffer (but since you cant do this with differing sizes its a no go, though u can stick the depth info in a texture and then draw that as any size u want, i.e. the same size argument seems a bit weak)
anyways I find the fastest method when I wanna lay down the same depth info in another texture/FB is to just redraw the whole scene again.
Is this what others have also experienced?