Difference between revisions of "Teleportation"

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(did some source diving, added section on valid teleport destinations (should do more wizmode testing to double-check...))
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There are three teleport-related properties: [[teleportitis]], which teleports you horizontally at random; [[teleport control]], which lets you choose where teleports land; and teleport at will, which lets you trigger teleportitis to happen whenever you want at a power cost.
 
There are three teleport-related properties: [[teleportitis]], which teleports you horizontally at random; [[teleport control]], which lets you choose where teleports land; and teleport at will, which lets you trigger teleportitis to happen whenever you want at a power cost.
  
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Horizontal teleportation almost always move you away from your current position, but there is a very rare chance to land on the [http://groups.google.com/group/rec.games.roguelike.nethack/msg/fd6ff9fff482a512 exact same square].
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Horizontal teleportation almost always move you away from your current position, but there is a very rare chance to land on the exact same square.<ref>http://groups.google.com/group/rec.games.roguelike.nethack/msg/fd6ff9fff482a512</ref>
  
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{{todo|Add more details about horizontal teleporation. It seems that you never land on a [[trap]], in [[water]] or in [[lava]].}}
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==Valid destinations==
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You cannot teleport to a square that is considered unsafe for you to occupy<ref>{{function|teleport.c|teleok}}</ref>, not even deliberately with teleport control. If you try, you will receive the message '''Sorry...''', and will be teleported randomly instead.<ref>{{sourcecode|teleport.c|444}}</ref>
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In particular:
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* You cannot teleport into [[water]] unless you're polymorphed into a [[flying]], [[swimming]] or [[amphibious]] monster, or have [[water walking]], [[magical breathing]] or [[intrinsic]] [[levitation]].<ref>{{sourcecode|teleport.c|61}}; for some reason, the code checks for <code>HLevitation</code>, which means intrinsic levitation only, rather than <code>Levitation</code>, which means levitation in general.</ref> Due to what may be a [[bug]], extrinsic levitation (from the [[levitation boots|boots]] or [[ring of levitation]]) does ''not'' count.
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* You also cannot teleport into [[lava]], unless you have intrinsic levitation.<ref>{{sourcecode|teleport.c|69}}</ref> (Again, extrinsic levitation isn't enough.)
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* If you're polymorphed into a [[sea monster]], you only have a 1 in 13 chance of successfully teleporting onto dry land.<ref>{{sourcecode|teleport.c|67}}</ref>
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* You cannot teleport onto a [[trap]], unless there are no other valid locations to teleport to. (The game will try 200 times to pick a safe location for you before considering trapped locations<ref>{{function|teleport.c|safe_teleds}}</ref>.) In particular, [[magic portal]]s are considered traps, so you cannot teleport directly onto your [[quest]] portal.
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* You cannot teleport into solid rock unless polymorphed into a [[phasing]] monster,<ref>{{sourcecode|teleport.c|75}}</ref> onto closed [[doors]] unless you're [[amorphous]],<ref>{{sourcecode|teleport.c|81}}</ref> or onto a [[boulder]] unless you're a [[giant]].<ref>{{sourcecode|teleport.c|83}}</ref>
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* You cannot teleport onto [[tree]]s, [[iron bars]] or a raised [[drawbridge]], nor into a [[secret door]] or [[secret corridor]].<ref>{{sourcecode|teleport.c|77}}; {{sourcecode|rm.h|32}} to line 84</ref>
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* You cannot teleport into the [[Wizard's tower]] from outside it, nor outside it from the inside.<ref>{{function|teleport.c|tele_jump_ok}}</ref>
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There is also some code the could prevent the player from teleporting in and out of force fields,<ref>{{sourcecode|teleport.c|225}}, {{function|region.c|in_out_region}}</ref> but those [[deferred feature|do not exist]] in vanilla NetHack 3.4.3.
  
 
==See also==
 
==See also==
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* [[Teleport control]]
 
* [[Teleport control]]
 
* [[Non-teleport level]]
 
* [[Non-teleport level]]
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==References==
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<references/>
  
 
[[Category:Actions]]
 
[[Category:Actions]]

Revision as of 01:09, 15 February 2015

Teleportation provides a quick escape to a different (often random) location. Some escape items can teleport you away from monsters. Some monsters can also teleport themselves to flee from you.

Teleportation comes from:

There are three teleport-related properties: teleportitis, which teleports you horizontally at random; teleport control, which lets you choose where teleports land; and teleport at will, which lets you trigger teleportitis to happen whenever you want at a power cost.

Horizontal teleportation almost always move you away from your current position, but there is a very rare chance to land on the exact same square.[1]

Valid destinations

You cannot teleport to a square that is considered unsafe for you to occupy[2], not even deliberately with teleport control. If you try, you will receive the message Sorry..., and will be teleported randomly instead.[3]

In particular:

  • You also cannot teleport into lava, unless you have intrinsic levitation.[5] (Again, extrinsic levitation isn't enough.)
  • If you're polymorphed into a sea monster, you only have a 1 in 13 chance of successfully teleporting onto dry land.[6]
  • You cannot teleport onto a trap, unless there are no other valid locations to teleport to. (The game will try 200 times to pick a safe location for you before considering trapped locations[7].) In particular, magic portals are considered traps, so you cannot teleport directly onto your quest portal.
  • You cannot teleport into the Wizard's tower from outside it, nor outside it from the inside.[12]

There is also some code the could prevent the player from teleporting in and out of force fields,[13] but those do not exist in vanilla NetHack 3.4.3.

See also

References

  1. ↑ http://groups.google.com/group/rec.games.roguelike.nethack/msg/fd6ff9fff482a512
  2. ↑ teleok in teleport.c
  3. ↑ teleport.c, line 444
  4. ↑ teleport.c, line 61; for some reason, the code checks for HLevitation, which means intrinsic levitation only, rather than Levitation, which means levitation in general.
  5. ↑ teleport.c, line 69
  6. ↑ teleport.c, line 67
  7. ↑ safe_teleds in teleport.c
  8. ↑ teleport.c, line 75
  9. ↑ teleport.c, line 81
  10. ↑ teleport.c, line 83
  11. ↑ teleport.c, line 77; rm.h, line 32 to line 84
  12. ↑ tele_jump_ok in teleport.c
  13. ↑ teleport.c, line 225, in_out_region in region.c
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