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Linked portal
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====Simple moving platform illusion==== You can put a linked portal in the ceiling of the inner sector to give the illusion that a simple platform is moving on the floor. It works if you used the [[Portal_Define]] special for the line portals and if the background room has the same ceiling height, or in very small variation, in the area where the polyobject moves. Acceptable variations are at most 8 map units. Otherwise, you get bleeding effects. The platform sector must have the ceiling height set to the maximum ceiling of the outside area. Set the '''portalceiling''' field of the sector to the same ID you used for the walls. Make sure the z offset of [[Portal_Define]] is set correctly: if the inner sector is a raised platform compared to the outside sector, the z offset should be the ''minimum'' ceiling height from the outside area, minus the elevation of the platform against the background. If it's a "moving pit", the z offset should be the negative of the height of the lowest ceiling detail from the outside area. It is recommended to set '''portal_ceil_nopass''' on the sector, especially if there is no height variation. This prevents unnecessary side effects. An example is available for download: [https://www.dropbox.com/s/xi1xhv92h27ptep/polyceilport.wad?dl=0 PolyCeilPort.wad].
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