Dynamic portals are literally the topic of this specific thread of comments. Here's the bit I originally replied to:

> [Prey] had portals before Portal.

Then you showed up conflating dynamic portals with compile-time map rendering, and now you're saying that dynamic portals, the very subject of this discussion, aren't worth talking about, because static portals, the preceding tech, existed earlier, even though dynamic portals clearly introduce fundamental design space as popularized by the critically-acclaimed game Portal.

The word "render" appears in your reply to my first comment six times, which is a lot in a discussion that is not at all about rendering.

Please correct any misunderstanding here on my part.