Attached surface linedef types

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Attached surfaces cause multiple sectors to move together. This allows for the creation of complex lifts, doors, or elevators comprised of multiple sectors which will remain synchronized even if any sector's movement is blocked by a player or other object.

Back to Linedef types

UDMF format[edit]

UDMF format doesn't use linedef types, but the floorid, ceilingid, attachfloor and attachceiling. They use IDs separate from the sector or linedef tags, equivalent to the linedef tags used in the classic format for this purpose.

Classic format[edit]

Attached surface linedefs are as follows:

  • 379 -- Attach_SetCeilingControl
The sector on the front side of this line will have its ceiling used to control the movement of the attached surfaces that share this line's tag number.
  • 380 -- Attach_SetFloorControl
The sector on the front side of this line will have its floor used to control the movement of the attached surfaces that share this line's tag.
  • 381 -- Attach_FloorToControl
The sector on the front side of this line will have its floor movement controlled by the surface whose control line shares this line's tag.
  • 382 -- Attach_CeilingToControl
The sector on the front side of this line will have its ceiling movement controlled by the surface whose control line shares this line's tag.
  • 383 -- Attach_MirrorFloorToControl
The sector on the front side of this line will have its floor movement controlled inversely by the surface whose control line shares this line's tag.
  • 384 -- Attach_MirrorCeilingToControl
The sector on the front side of this line will have its ceiling movement controlled inversely by the surface whose control line shares this line's tag.

Using attached surfaces with linked portals[edit]

Attached surfaces can be used to create effects like doors or lifts between different sector groups connected by linked portals.

One sector is the "control", which the attached surfaces will move in sync with. The control can either be inside the map or a dummy sector outside of it.

Put an Attach_SetFloorControl special on a line with its front side facing the control sector and give it a tag. Then put Attach_FloorToControl specials on lines facing all the sectors to be attached to it.

By use of the mirror attachments you can, for example, attach a ceiling to the mirrored movement of a floor, to create a split door which opens from the middle.

385 (Apply_PortalToFrontsector) isn't directly related to attached surfaces, but is useful for them because it makes it possible to have lifts and such tagged in sectors that are also tagged for portals. The portal is tagged by putting a line with special 385 facing the affected sector(s), and the line's tag set to the portal tag number you want to apply to those sectors.

Build the same lift or elevator on both sides of your portal (this will require floors that are higher than the ceiling on one side of it), attach one of them to the other, and set up the portal between them.