User:Tjr/object generation spoiler

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Legwork for an Object Creation Spoiler

This treats only those cases that aren't restricted to monster inventory items or certain useless items. It's mostly interesting for pacifists, as they don't get any death drops. Specifically, I wanted to know how likely a 12-conduct character is to find holy water, a scroll of scare monster, a magic whistle and so on.

A preliminary results table is available at [1]. Numerical instabilities mean you should trust at most the three leading digits.

Containers

Contents of containers are complicated, not just rn2(..) things: Mkobj.c#mkbox_cnts

Unless stated otherwise, all items can be containers, which hold more items.

In a normal rooms-and-corridor level at level creation time.

Mklev.c#makelevel

You need the distribution of rooms per level, and room sizes. Rooms per level, from counting 10 games: 5(7/222), 6(28/222), 7(68/222), 8(83/222), 9(30/222), 10(4/222), 11(2/222).

Random objects on the floor in each ordinary room.

  • ... chance of non-special room ...
  • 1/3 chance of a monsters, which might be a snake/spider.
  • (1/10 chance fountain, independently 1/60 sink for a ring, 1/60 altar ..)
  • 1/(80-2*depth) chance of one grave, which will hold rn2(5) cursed items
  • 1/20 chance of a statue, which has (1-10/(10 + depth/2)) chance of one spellbook, provided the statue isn't very small.
  • 1/(nroom * 5 / 2) chance of: 1/3 chest 2/3 large box
  • 1/3 chance of objects at all, 4/5*(1/5)^n prob for n+1 objects, n>=0. Containers are eligible.

make_niches()

  • 1d(rooms/2 +1) proto-niches.
  • dlev 1-5: all, dlev 6-15: 5/6, dlev 16-24 25/36, dlev 25-end 5/6 are a non-trap niche.
  • 8 retries to find a room with !=1 door (20% chance anyway), non-special, and hitting a place to put the niche (unlikely to fail).
  • 3/4*6/7*1/3 of those get another random object, but they never have a secret door.

shops

  • 1<dlev<medusalevel && 45.3%chance && rn2(u_depth) < 3)
  • mkroom(SHOPBASE)
  • Each square has (dlevel)% chance of a mimic, else make a fitting object. Shknam.c#mkshobj_at

(45.3% due to http://groups.google.com/group/rec.games.roguelike.nethack/msg/9071578a7d8cddaf)

court room

1 chest

  • 4<dlev<castle && no shop && 1/6 chance

graveyard boxes

  • 11<dlev<castle && noshop && 5/6*7/8*6/7*4/5*4/5*1/6
  • each square has 1/10 chance of 2/3 large box, 1/3 chest

barracks containers

  • 14<dlev<castle && noshop && 5/6*7/8*6/7*4/5*4/5*5/6*7/8*1/4
  • each square has 1/20 chance of 2/3 large box, 1/3 chest

cockatrice nest statues

  • 16<dlev<castle && noshop && 5/6*7/8*6/7*4/5*4/5*5/6*7/8*3/4*5/6*1/8
  • each square has 1/3 chance of statue with rn2(5) items

ant hole

  • 1/3 chance of a food item per square

Special levels etc

special levels, a bizarre case, mines levels, quest filler, post-Medusa maze, rogue level: Mklev.c#line627 ff

Special level Random-class objects Fixed-class objects Random traps
Oracle 6 -- 3
Big room 15 -- 6
Ludios 0 1chest, gems, gold, 70barracks 0
Rogue ?? fake bones ??
Medusa, central 8 75% reflection, 25% levitation, 50% +2 scimitar, 50% sack 5
Medusa, titan 6 25% reflection, 75% levitation, 50% +2 scimitar, 50% sack, one wand 4
Castle maze 14 armor, 14 weapon, 14 food, 14 gem, 36barracks, 1 wishing 204maze
Mines filler 3 3 random objects, 1 tool, 3 gems 6
Fontier town 0 90%*9general, 90%*9tools, 90%*4food, 100%*6light 2
Town square 0 90%*9general, 90%*9tools, 90%*9food, 100%*9light 2
Alley town 0 100%*6general, 40%*6tools, 30%*4tools, 90%*4food, 30%*4wand, 100%*6light 2
College Town 0 90%*6general, 90%*6tools, 100%*6book, 90%*4food, 100%*6light 2
Grotto Town 0 100%*9general, 100%*9tools, 100%*4food, 100%*9light, 1 ring, 1 chest, 1 tool, 1 statue 0
Bustling Town 0 100%*6general, 100%*6tools, 100%*4food, 100%*6light, 2 trees 0
Bazaar Town 0 60%*4general, 30%*6tools, 50%*4tools, 50%*4food, 50%*4food, 100%*6light 2,sink
Mimic of the Mines 3 2 tools, 7 gems + fixed caches 6
Gnome King's Wine Cellar 3 2 tools, 14 gems + fixed caches, 2 potions + 6 booze + 1 object det 6
Catacombs 3 7 gems +fixed, luck, 5 scrolls, 4 books 7
Sokoban 0 4 food, 1 ring, 1 wand; 2 earth on lowest; treasure on uppermost 0
Wizard home 0 1 chest 6
Wizard filler 9 -- 4
Wizard locate 15 -- 1poly
Gehennom maze
Valley of the Dead
Asmodeus
Juiblex
Baalzebub
Orcus
Fakewiz
Rodney1
Rodney2
Rodney3
Sanctum
Vlad1
Vlad2
Vlad3

The mines shops can contain mimics. Trees can yield fruit once (1/6 chance of eucalyptus) when kicked repeatedly, then again (1/5 chance) when cut down. dokick.c, line 899,dig.c, line 341.

still to track maze objects: mkmaze.c#line633

level descriptions can contain objects: Sp_lev.c#line934, Sp_lev.c#line951

Monsters

  • Spiders and snakes get a random object in makelevel.
  • Quantum mechanic boxes are always empty. makemon.c:963
  • Player monsters (Astral Plane only) get 1d10 objects, possibly with contents. Mplayer.c#line266.

Conduct-breakers

Random Alchemy

Potion.c#line1697

Initial inventory

U_init.c#line917

Saving and restoring

including bones files