Visual portals to other surfaces

[SWeini]

TL;DR

Render a part of the map on top of the map somewhere else.

What?

Factorissimo 3 does something like this on mouse-over

12-10-2025, 17-46-12.png (1.51 MiB) Viewed 76 times

However, there are some restrictions:

• has problems with sizing (I had it matching previously, might be a bug in the mod, but shows how tricky it is to get right in a mod)
• lags behind when moving the camera (as it has to adjust the position of the overlay via events)
• doesn't have recursion implemented

The minimalistic implementation only allows a rectangular area of some surface to show at a specific location on some other (or same) surface. But I believe mods would use even more advanced features:

• non-rectangular areas
• areas that are of massive size (like a ribbon world that wraps around)
• recursive rendering of those portals (up to a max depth)
• user-defined rules for when it is visible (explicit switch, mouse-over, close to player, close to camera)
• dynamic visibility (as if looking into through a door), see video here:

  portal-clip-smaller.mp4

  (71.81 MiB) Downloaded 4 times

Why?

We have linked belts, linked pipes, cross-surface wires, but we don't have cross-surface visibility.