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Editing v0.34:Bridge
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{{quality|Exceptional|22:21, 10 November 2010 (UTC)}}{{av}} | {{quality|Exceptional|22:21, 10 November 2010 (UTC)}}{{av}} | ||
− | '''Bridges''' are [[building]]s which provide a temporarily walkable floor that can either be removed ("retracting" bridges) or turned into a wall ("raising" bridges) via linked [[mechanism]]s. Bridges are useful for crossing empty space and dangerous terrain, serve a vital role in [[Defense design|fortress defense]], and have a host of ancillary uses. For example, using bridges to control [[flow|fluids]] can save a ton of mechanisms and time, especially when the | + | '''Bridges''' are [[building]]s which provide a temporarily walkable floor that can either be removed ("retracting" bridges) or turned into a wall ("raising" bridges) via linked [[mechanism]]s. Bridges are useful for crossing empty space and dangerous terrain, serve a vital role in [[Defense design|fortress defense]], and have a host of ancillary uses. For example, using bridges to control [[flow|fluids]] can save a ton of mechanisms and time, especially when the fluid in question requires a wide opening. |
==Building Bridges== | ==Building Bridges== | ||
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===Materials=== | ===Materials=== | ||
− | Bridges require number of tiles divided by four, rounded down, plus one ( | + | Bridges require number of tiles divided by four, rounded down, plus one ( Tiles/4+1 ) of material to build. When choosing materials, they are placed on the list in order of distance. However, neither the closest material, nor the item picked first, nor the majority of material, nor the most expensive material is necessarily the "core" material that will define the color and name of the bridge. The sane man's way to deal with this is to just pick the same material for the entire bridge and be done with it. The others are caught in a testing loop. Help! |
− | The "core" material | + | The "core" material possibly defines how fire resistant a brige is, although this hasn't been tested.{{verify}} |
− | Care should be taken when choosing materials for bridges that will be exposed to [[fire]] or [[magma]]. Bridges built with non-[[magma-safe]] materials will heat up and eventually melt if the center tiles get covered in magma or exposed to fire, whether the bridge is raised, lowered, or even retracted | + | Care should be taken when choosing materials for bridges that will be exposed to [[fire]] or [[magma]]. Bridges built with non-[[magma-safe]] materials will heat up and eventually melt if the center tiles get covered in magma or exposed to fire, whether the bridge is raised, lowered, or even retracted. [[Dragon]]fire is so hot that it can destroy bridges made of almost any material, but a bridge made of [[adamantine]] can sustain dragonfire for extended periods of time before it melts. |
==Raising and Retracting Bridges== | ==Raising and Retracting Bridges== | ||
− | All bridges in DF can be either raised or retracted by linking it to a trigger with [[mechanism]]s. This requires a dwarf with the [[mechanics]] labor activated. | + | All bridges in DF can be either raised or retracted by linking it to a trigger with [[mechanism]]s. This requires a [[mechanic's workshop]] and a dwarf with the [[mechanics]] labor activated. |
− | If a bridge is set to retract when | + | If a bridge is set to retract when the lever is pulled, the bridge essentially disappears, droping anything (friend, foe, or object) on the bridge into whatever is underneath. Clearly this can be used to drop your enemies to rocky/watery/fiery deaths (or anything more imaginative you can think up!). |
− | If a bridge is set to raise when | + | If a bridge is set to raise when the lever is pulled, the bridge will become a [[wall]] along the edge selected with the {{k|w}}{{k|a}}{{k|d}}{{k|x}} keys when placing the bridge. When activated, the bridge "raises" very quickly, flinging anything on the bridge into the air, with unpleasant if not always deadly side effects. The resulting wall is always one z-level tall, watertight, and invulnerable to [[building destroyer]]s. Raising "drawbridges" can be used to block fortress entrances and corridors. When lowered, bridges will destroy anything on the underlying tiles. By destroying we mean dwarves, foes, items will entirely disappear from the game, a rare event, which lead to creation of the term [[dwarven atom smasher]]. |
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==Notes== | ==Notes== | ||
− | Bridges will not operate if any one creature of [[List of creatures by adult size#bridge|size 1200000]] is on them. This weight limit is not cumulative - a bridge will still retract if a hundred goblins are standing on it, but a single | + | Bridges will not operate if any one creature of [[List of creatures by adult size#bridge|size 1200000]] is on them. This weight limit is not cumulative - a bridge will still retract if a hundred goblins are standing on it, but a single rutherer accompanying those goblins will prevent the bridge from operating. Attempting to lower a drawbridge onto such a creature (in order to [[Dwarven atom smasher|atom-smash]] it) will cause the bridge itself to deconstruct. |
− | It is impossible to channel out stone that is directly under a bridge | + | It is impossible to channel out stone that is directly under a bridge. Likewise digging a ramp under a bridge will not remove the floor tile. To remove these floor tiles, the bridge must be deconstructed. Note that [[obsidian]] casting can ''create'' new floor tiles under a bridge, which then behave in the manner above. |
Big bridges can take weeks or even months to complete. You can shorten construction time by moving the materials to the site before starting construction, and by using blocks instead of rocks. The material-gathering time is somewhat shorter for blocks due to their lesser weight, and the actual construction is three times faster for blocks. | Big bridges can take weeks or even months to complete. You can shorten construction time by moving the materials to the site before starting construction, and by using blocks instead of rocks. The material-gathering time is somewhat shorter for blocks due to their lesser weight, and the actual construction is three times faster for blocks. | ||
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|Will cause a cave-in | |Will cause a cave-in | ||
|Will '''not''' cause a cave-in | |Will '''not''' cause a cave-in | ||
+ | |Key | ||
|- | |- | ||
− | | | + | |{{Diagram|spaces=no| |
− | + | BBB. | |
− | + | BBBX | |
− | + | BBB. | |
− | + | FFFW | |
− | + | }} | |
− | < | + | |{{Diagram|spaces=no| |
− | | | + | BBB. |
− | < | + | BBBX |
− | + | BBBW | |
− | + | FFFW | |
− | + | }} | |
− | + | |{{DFtext|B}} Bridge<br> | |
− | < | + | {{DFtext|F}} Floor tile<br> |
+ | {{DFtext|W}} Existing wall<br> | ||
+ | {{DFtext|X}} Wall to be constructed | ||
|} | |} | ||
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A raised bridge cannot be linked to a lever from the inside - the mechanic must be able to access the center tile of the bridge when lowered. | A raised bridge cannot be linked to a lever from the inside - the mechanic must be able to access the center tile of the bridge when lowered. | ||
− | If you aren't sure whether or not a 1 tile thick bridge is raised or lowered, try to build a piece of furniture, like a statue, on it. If it says blocked, the bridge is raised, if it says building present, it is lowered | + | If you aren't sure whether or not a 1 tile thick bridge is raised or lowered, try to build a piece of furniture, like a statue, on it. If it says blocked, the bridge is raised, if it says building present, it is lowered. |
==Uses== | ==Uses== | ||
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===Waste disposal=== | ===Waste disposal=== | ||
− | Lowering raised bridges can be used as [[waste disposal]] for unwanted stones, [[refuse]], [[goblin]]s (dead or alive), legendary [[cheese]] makers and [[nobles]], to name a few. Even fluids get destroyed. Note, however, that lowering a drawbridge onto a sufficiently large creature (such as a [[forgotten beast]]) simply causes the bridge to deconstruct. | + | Lowering raised bridges can be used as [[dwarven atom smasher|waste disposal]] for unwanted stones, [[refuse]], [[goblin]]s (dead or alive), legendary [[cheese]] makers and [[nobles]], to name a few. Even fluids get destroyed. Note, however, that lowering a drawbridge onto a sufficiently large creature (such as a [[forgotten beast]]) simply causes the bridge to deconstruct. |
===[[Trap_design#Bridge_and_drop_traps|Traps]]=== | ===[[Trap_design#Bridge_and_drop_traps|Traps]]=== | ||
Using two bridges at opposite ends of a corridor creates a very large and simple trap by walling in enemies. Or... Smashing them to tiny bits if placed to raise facing each other, with no space in between. | Using two bridges at opposite ends of a corridor creates a very large and simple trap by walling in enemies. Or... Smashing them to tiny bits if placed to raise facing each other, with no space in between. | ||
− | For added effect, place [[pressure plate]]s on both ends to raise the bridge when stepped on, to fling the units. If there is a [[floor]] directly above, they will be stunned. If there is a floor beneath the bridge, and if nobody is on the pressure plate, they will likely be smashed when the bridges come back down. | + | For added effect, place [[pressure plate]]s on both ends to raise the bridge when stepped on, to fling the units. If there is a [[floor]] directly above, they will be stunned. If there is a floor beneath the bridge, and if nobody is on the pressure plate, they will likely be smashed when the bridges come back down. If there is no floor beneath the bridge, they will fall, sometimes into something [[water|very,]] [[magma|very]] [[megabeast|bad.]] |
− | If there is no floor beneath the bridge, they will fall, sometimes into something [[water|very,]] [[magma|very]] [[megabeast|bad.]] | ||
===Minecart routing=== | ===Minecart routing=== | ||
− | + | [[Minecart]]s can travel along unraised/unretracted bridges as if the bridge was a minecart track. This can let you change minecart routes via pulling levers. | |
===[[Cave-in]]s=== | ===[[Cave-in]]s=== | ||
Since bridges don't support adjoining rock, it is possible to set up a cave-in so that dust can't come up, dwarves can't fall down, and flying creatures can't come up from beneath the cave-in before you set it off. Bridges are also instrumental in [[magma]]-piston applications. | Since bridges don't support adjoining rock, it is possible to set up a cave-in so that dust can't come up, dwarves can't fall down, and flying creatures can't come up from beneath the cave-in before you set it off. Bridges are also instrumental in [[magma]]-piston applications. | ||
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===Improvised walls=== | ===Improvised walls=== | ||
− | [[Wall]]s cannot be built along map edges | + | [[Wall]]s cannot be built along map edges, but raising bridges can. Because these bridges can be raised to act as walls, they can be used to control where wildlife, enemies, and [[caravan]]s spawn on the map edges. |
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===Ocean drains=== | ===Ocean drains=== | ||
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===Coinstar training=== | ===Coinstar training=== | ||
The mechanical "tossing" action of retracting bridges can be used for training [[armor user]] and associated traits by repeatedly flinging small items at the trainee. See [[Danger_room#Coinstar_Room|Danger room]] for more information. | The mechanical "tossing" action of retracting bridges can be used for training [[armor user]] and associated traits by repeatedly flinging small items at the trainee. See [[Danger_room#Coinstar_Room|Danger room]] for more information. | ||
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{{buildings}} | {{buildings}} |