[d3VwsX]

Pretty sure water was just a teleporter? You may be thinking about the mirror effect? I think that was a kind of a portal effect. You had to make a large empty section behind each mirror that was used by the engine to render a mirrored copy of things in front of the mirror.

You could make some weird impossible geometries by just superimposing sections. Two sections could occupy the exact same coordinates, but movement and rendering were done across edges shared by sections and did not care about if there was some other section in the same space. As long as there was never a way to see those sections at the same time.

[Sharlin]

A teleporter is just a portal that you can’t see through.

> You could make some weird impossible geometries by just superimposing sections. Two sections could occupy the exact same coordinates, but movement and rendering were done across edges shared by sections and did not care about if there was some other section in the same space. As long as there was never a way to see those sections at the same time.

This is exactly what portals are.

[CyberDildonics]

Pretty sure water was just a teleporter? You may be thinking about the mirror effect?

That's what they just said? They didn't mention the mirror effect? The mirror effect was done with duplicate geometry? It occupied the overlapping space of what was behind it? The build engine also didn't have vertical levels.

[paulryanrogers]

Shadow Warrior (Build) did have some room over room stuff. But IIRC it still leveraged offset sectors like Duke's water. FWIW some modern Doom ports appear to have this as well, at least with levels that support it.