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Scroller linedef types
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===Displacement Scrollers=== In the first kind, displacement scrolling, the position of the scrolled objects or walls changes proportionally to the motion of the floor or ceiling in the sector on the first sidedef of the scrolling trigger. The proportionality is set by the length of the linedef trigger. If it is 32 units long, the wall, floor, ceiling, or object moves 1 unit for each unit the floor or ceiling of the controlling sector moves. If it is 64 long, they move 2 units per unit of relative floor/ceiling motion in the controlling sector and so on. * 245 -- Scroll Tagged Ceiling w.r.t. 1st Side's Sector The tagged sector's ceiling texture scrolls in the direction of the scrolling trigger line, when the sector on the trigger's first sidedef changes height. The amount moved is the height change times the trigger length, divided by 32. Objects attached to the ceiling do not move. UDMF equivalent: [[Scroll_Ceiling]](tag, 5, 0, 0, 0) * 246 -- Scroll Tagged Floor w.r.t. 1st Side's Sector The tagged sector's floor texture scrolls in the direction of the scrolling trigger line when the sector on the trigger's first sidedef changes height. The amount moved is the height change times the trigger length, divided by 32. Objects on the floor do not move. UDMF equivalent: [[Scroll_Floor]](tag, 5, 0, 0, 0) * 247 -- Push Objects on Tagged Floor wrt 1st Side's Sector Objects on the tagged sector's floor move in the direction of the scrolling trigger line when the sector on the trigger's first sidedef changes height. The amount moved is the height change times the trigger length, divided by 32. UDMF equivalent: [[Scroll_Floor]](tag, 5, 1, 0, 0) * 248 -- Push Objects & Tagged Floor wrt 1st Side's Sector The tagged sector's floor texture, and objects on the floor, move in the direction of the scrolling trigger line when the sector on the trigger's first sidedef changes height. The amount moved is the height change times the trigger length, divided by 32. UDMF equivalent: [[Scroll_Floor]](tag, 5, 2, 0, 0) * 249 -- Scroll Tagged Wall w.r.t 1st Side's Sector Walls with the same tag as the linedef trigger scroll at the same rate as a floor or ceiling controlled by one of 245-249, allowing their motion to be synchronized. When the linedef trigger is not parallel to the wall, the component of the linedef in the direction perpendicular to the wall causes the wall to scroll vertically. The length of the component parallel to the wall sets the horizontal scroll displacement, the length of the component perpendicular to the wall sets the vertical scroll displacement. The distance scrolled is the controlling sector's height change times the trigger length, divided by 32. UDMF equivalent: [[Scroll_Texture_Model]](lineid, 1) ====MBF21==== * 1025 -- Scroll Tagged Wall by Sidedef Offsets w.r.t. 1st Side's Sector Similar to 249, but uses the sidedef offsets of the trigger linedef (divided by 8) instead of the line's vector.
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