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===Attached portals=== You can attach linked portals to their floors or ceiling. By default they stay fixed, so that making elevators going through portals is possible. But if you want the linked portal to move along with the floor or ceiling over which it's drawn, you enable the [[UDMF]] '''portal_floor_attached''' or '''portal_ceil_attached''' flags, or the [[ExtraData]] '''ATTACHEDPORTAL''' portal flag. Set these flags for both parts of the portal, and combine them with the [[attached surfaces]] feature, so that all required surfaces move synchronized. An example usage of this is a platform you can walk both under and above, which is made possible by sector portals (optionally with [[edge portals]] surrounding it). Giving the "attached portal" flag to the portals, and attaching both their surfaces and platform's surfaces to a moving floor, will allow you to setup the effect of the platform itself bobbing up and down. You can also setup other less realistic effects with this flag.
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