changing from perspective to ortho back to perspective

[crappy04]

i was wondering if there is a better way to write text to the screen on top of another 3d screen. what i have now is i change the projection matrix to ortho, after i initially draw the 3d scence in perspective, then draw all the text in ortho. then i switch back to the perspective. it seems to work great but i have a feeling in my mind that this is not the most efficient way of doing this. any input would be very much appreciated
thanks
porter

[DFrey]

Nope, that is how just about everyone does it. Now how to revert back to the perspective projection may differ from one app to another. But that's a small detail and in the grand scheme, the cost of modifing the projection matrix twice per frame is insignificant.

[crappy04]

thanks very much, i just wanted to make sure that changing the projection matrix does not cost alot and im glad to see this is the case
thanks