ZDoom

[quote="Enjay"]This kind of thing is available in a limited form simply with teleport lines too. There have been plenty of WADs released where the player climbs up inside a multi-story building. It seems to happen seamlessly but when you check the map, the floors are in different locations and you have teleported between them at some point where the teleport is as unnoticeable as possible.[/quote]

The biggest give away is when sprites or decals disappear as you are moving from floor to floor...

Also still LOL'ing hard at Siggi's pic

This kind of thing is available in a limited form simply with teleport lines too. There have been plenty of WADs released where the player climbs up inside a multi-story building. It seems to happen seamlessly but when you check the map, the floors are in different locations and you have teleported between them at some point where the teleport is as unnoticeable as possible.

Yeah... I really wish ZDoom could get that kind of portals.

^ I guess this kind of thing is entirely possible with Eternity's portals... ^

Speaking of which, It would be interesting at some point to be able to make spherical levels. (Not literally, but just an illusion, ie. Terminal Velocity/Fury3/Hellbender, or Star Fox 64 Multiplayer), where going to the edge of a map, allows you to see from the opposite side at the same position, and walking past the edge takes you to the opposite side, giving the illusion of traveling outwards infinitely. I imagine some trickery with Silent Teleports would technically be possible, but the only thing is, that doesn't account for seeing things on the other side, making for some serious pop-in.

Doom isn't a portal engine like the Jedi Engine (Dark Forces, Outlaws) or Build (Duke 3D, Blood, etc.). Instead, it uses a binary space partition tree which offers faster performances but locks the geometry.

ZDoom only uses portals for ceiling surfaces (this is called [wiki]stacked sectors[/wiki]), not walls. The [wiki]Eternity Engine[/wiki] offers wall portals, though, if you want to try it.

[quote="BlueSatoshi"]Sorry that I haven't replied. When I asked about non-euclidean geometry I meant if it was possible to stitch separate sectors like in the following image:

[img]http://i.imgur.com/lwsVWzT.png[/img]

In this case instead of connecting two small rooms I think this would work for something like connecting several large areas with a small hub without the need for long tunnels or teleportation.

Hope this helps.[/quote]

Yes. Portals do exactly what you're talking about. A portal is when you cross a linedef and you end up in a completely different place, and when you look at the "portal" from one side, you see what's on the other side as if nothing was wrong. Except possibly you could have things that if they were actually connected to the hub they would overlap with other things connected to it.

Sorry that I haven't replied. When I asked about non-euclidean geometry I meant if it was possible to stitch separate sectors like in the following image:

[img]http://i.imgur.com/lwsVWzT.png[/img]

In this case instead of connecting two small rooms I think this would work for something like connecting several large areas with a small hub without the need for long tunnels or teleportation.

Hope this helps.

omg i think i almost died laughing

This is clearly what OP has in mind:
[img]http://i.imgur.com/mexLkj8.png[/img]

Yes, non-euclidean geometry is possible:
[youtube]l-MBYWPM4Ps[/youtube]

I can only assume OP has just played Antichamber.

[youtube]zT2VlffrSMg[/youtube]

err... is it there a game which does what the OP asks? Knowing the complex formulas to change geometry, it's hard to believe that...

He means non-Euclidean as in [url=http://en.wikipedia.org/wiki/Hyperbolic_geometry]hyperbolic[/url], or [url=http://en.wikipedia.org/wiki/Elliptical_geometry]elliptic[/url], for example. I think.

Now, if he means in-game, or what, I have no idea.

It's already possible... you just need to go deeper...