Portal 2D (tech demo)

[The Doctor]

You're seriously thinking with portals! This has got potential!

[ljdp]

You're seriously thinking with portals! This has got potential!

I'm surprised at how simple it was to implement, but I must thank vrld for implementing stencils, I wouldn't have a clue when it comes to talking directly to openGL so I can't imagine how valve did all this in 3d. It should also be possible now to do the portal-within-a-portal effect, brb going to find my thinking cap.

Edit: Ok I take back it being simple to implement, recursion is making me go crosseyed.
I can get recursive portals to work if the angle of both are 0, as soon as they're any other angle they refuse to line up.

[Lexsym]

valve created a camera object, and projected it onto the "portal" and the camera's angles were set to that of the player's. In simplicity

[GijsB]

valve created a camera object, and projected it onto the "portal" and the camera's angles were set to that of the player's. In simplicity

wouldn't it be better if they changed the 3D engine so, when a ray hitted a portal it will change position and direction?

[Taehl]

No, because Portal (like all games) isn't rendered via raytracing...

[GijsB]

hmm.

[ljdp]

No, because Portal (like all games) isn't rendered via raytracing...

Surely raytracing must happen at some point low level, in the graphics card?

[bartbes]

Nope. In fact, raytracing is never used in games, because it is too slow, it provides amazing detail, but can't be done realtime.

[GijsB]

Nope. In fact, raytracing is never used in games, because it is too slow, it provides amazing detail, but can't be done realtime.

And there you're wrong, search it up

Edit : As you can see here ; http://www.youtube.com/watch?v=blfxI1cVOzU (IN 2007!!)

[slime]

Nope. In fact, raytracing is never used in games, because it is too slow, it provides amazing detail, but can't be done realtime.

And there you're wrong, search it up

Edit : As you can see here ; http://www.youtube.com/watch?v=blfxI1cVOzU (IN 2007!!)

That's a demonstration, not an actual game. It can be done realtime, but realistically right now you can't do raytracing plus everything else that a game needs to do at the same time (unless you want to make a game that only $2000+ computers can run).