Dwarf Fortress Bug Tracker - Dwarf Fortress
View Issue Details
0001227Dwarf FortressAdventure Mode -- Sitespublic2010-04-16 03:452012-03-04 08:03
Yaant 
Footkerchief 
normalminorhave not tried
resolvedsuspended 
WindowsWindows 20005.00.2195 SP4
0.31.03 
 
0001227: Some world gen mountains halls are inaccessible, possibly caused by erosion
Some mountain halls cannot be entered in adventure mode, because the top level (where all down stairs are located) is located above the ground level, so from adventurer's point of view it looks like a rectangular wall without any means to get to the top.
1.Generate world with following parameters:
  LARGE REGION
  Seed: 3894293870
  History Seed: 2262357010
  Name Seed: 3735191706
  Creature Seed: 2116295528
2. Visit some generated mountain halls as an adventurer.
Seems to be happening if there's a lot of level difference in the ground where the mountain hall is located, though not every time
adventure mode, Dwarf, worldgen
related to 0000032resolved Toady One World gen mountain halls / dwarf pits don't branch out from their "stairwell" 
Issue History
2010-04-16 03:45YaantNew Issue
2010-04-16 08:51FootkerchiefNote Added: 0003851
2010-04-16 08:51FootkerchiefNote Edited: 0003851bug_revision_view_page.php?bugnote_id=0003851#r1287
2010-04-16 08:51FootkerchiefNote Edited: 0003851bug_revision_view_page.php?bugnote_id=0003851#r1288
2010-04-16 08:52FootkerchiefIssue Monitored: Footkerchief
2010-04-16 08:52FootkerchiefRelationship addedrelated to 0000688
2010-04-16 08:57KennelTag Attached: adventure mode
2010-04-16 08:57KennelTag Attached: Dwarf
2010-04-16 08:57KennelTag Attached: worldgen
2010-04-17 15:44YaantNote Added: 0004002
2010-04-19 08:13YaantNote Added: 0004231
2010-04-19 09:47FootkerchiefNote Added: 0004241
2010-04-21 12:14FootkerchiefRelationship addedrelated to 0000032
2010-04-21 12:14FootkerchiefRelationship deletedrelated to 0000688
2010-04-26 17:42FootkerchiefSummarySome world gen mountains halls are inaccessible => Some world gen mountains halls are inaccessible, possibly caused by erosion
2010-12-10 13:16FootkerchiefTag Attached: Fixed in 0.31.19?
2011-03-01 14:05FootkerchiefNote Added: 0015640
2011-03-01 14:05FootkerchiefStatusnew => resolved
2011-03-01 14:05FootkerchiefResolutionopen => suspended
2011-03-01 14:05FootkerchiefAssigned To => Footkerchief
2012-03-04 08:03DwarfuTag Detached: Fixed in 0.31.19?

Notes
(0003851)
Footkerchief   
2010-04-16 08:51   
It would be helpful if you could name a particular site in that world that is known to demonstrate this problem. Otherwise, Toady will have to waste time guessing.

(0004002)
Yaant   
2010-04-17 15:44   
Hm, I've tried to recreate that world on my home WinXP machine to check site names, but got quite different world using same seeds (originally it was created on work Win2000 machine). Though it could be some mistake on my part, would have to recheck seeds when I'll get to work on Monday.
Meanwhile I'll try to reproduce the problem on some smaller worlds, if I'll be successful, then would post seeds and site names here.
(0004231)
Yaant   
2010-04-19 08:13   
Oops, it turned out that I've tweaked some default worldgen options and forgot about it, so it explains getting different worlds. :)
Here's the full world_gen_param.txt then:

Created in DF v0.31.03.
[WORLD_GEN]
    [TITLE:LARGE REGION]
    [SEED:3894293870]
    [HISTORY_SEED:2262357010]
    [NAME_SEED:3735191706]
    [CREATURE_SEED:2116295528]
    [DIM:257:257]
    [EMBARK_POINTS:1274]
    [END_YEAR:1050]
    [BEAST_END_YEAR:300:80]
    [REVEAL_ALL_HISTORY:1]
    [CULL_HISTORICAL_FIGURES:1]
    [ELEVATION:1:400:800:800]
    [RAINFALL:0:100:400:400]
    [TEMPERATURE:25:75:400:400]
    [DRAINAGE:0:100:400:400]
    [VOLCANISM:0:100:400:400]
    [SAVAGERY:0:100:400:400]
    [ELEVATION_FREQUENCY:1:1:1:1:1:1]
    [RAIN_FREQUENCY:1:1:1:1:1:1]
    [DRAINAGE_FREQUENCY:1:1:1:1:1:1]
    [TEMPERATURE_FREQUENCY:1:1:1:1:1:1]
    [SAVAGERY_FREQUENCY:1:1:1:1:1:1]
    [VOLCANISM_FREQUENCY:1:1:1:1:1:1]
    [TITAN_NUMBER:33]
    [TITAN_ATTACK_TRIGGER:80:0:100000]
    [DEMON_NUMBER:60]
    [GOOD_SQ_COUNTS:100:1000:2000]
    [EVIL_SQ_COUNTS:100:1000:2000]
    [PEAK_NUMBER_MIN:50]
    [PARTIAL_OCEAN_EDGE_MIN:0]
    [COMPLETE_OCEAN_EDGE_MIN:0]
    [VOLCANO_MIN:15]
    [REGION_COUNTS:SWAMP:1032:7:3]
    [REGION_COUNTS:DESERT:1032:5:3]
    [REGION_COUNTS:FOREST:4128:13:12]
    [REGION_COUNTS:MOUNTAINS:8256:9:2]
    [REGION_COUNTS:OCEAN:8256:7:0]
    [REGION_COUNTS:GLACIER:0:0:0]
    [REGION_COUNTS:TUNDRA:0:0:0]
    [REGION_COUNTS:GRASSLAND:8256:13:7]
    [REGION_COUNTS:HILLS:8256:13:8]
    [EROSION_CYCLE_COUNT:250]
    [RIVER_MINS:400:400]
    [PERIODICALLY_ERODE_EXTREMES:1]
    [OROGRAPHIC_PRECIPITATION:1]
    [SUBREGION_MAX:2750]
    [CAVERN_LAYER_COUNT:3]
    [CAVERN_LAYER_OPENNESS_MIN:0]
    [CAVERN_LAYER_OPENNESS_MAX:100]
    [CAVERN_LAYER_PASSAGE_DENSITY_MIN:0]
    [CAVERN_LAYER_PASSAGE_DENSITY_MAX:100]
    [CAVERN_LAYER_WATER_MIN:0]
    [CAVERN_LAYER_WATER_MAX:100]
    [HAVE_BOTTOM_LAYER_1:1]
    [HAVE_BOTTOM_LAYER_2:1]
    [LEVELS_ABOVE_GROUND:15]
    [LEVELS_ABOVE_LAYER_1:5]
    [LEVELS_ABOVE_LAYER_2:1]
    [LEVELS_ABOVE_LAYER_3:1]
    [LEVELS_ABOVE_LAYER_4:1]
    [LEVELS_ABOVE_LAYER_5:2]
    [LEVELS_AT_BOTTOM:1]
    [CAVE_MIN_SIZE:5]
    [CAVE_MIN_SIZE:5]
    [CAVE_MAX_SIZE:25]
    [MOUNTAIN_CAVE_MIN:100]
    [NON_MOUNTAIN_CAVE_MIN:200]
    [ALL_CAVES_VISIBLE:0]
    [SHOW_EMBARK_TUNNEL:2]
    [TOTAL_CIV_NUMBER:50]
    [TOTAL_CIV_POPULATION:30000]
    [PLAYABLE_CIVILIZATION_REQUIRED:1]
    [ELEVATION_RANGES:8256:16512:8256]
    [RAIN_RANGES:8256:16512:8256]
    [DRAINAGE_RANGES:8256:16512:8256]
    [SAVAGERY_RANGES:8256:16512:8256]
    [VOLCANISM_RANGES:8256:16512:8256]

Problematic site is Atisalil, "Stakeglee", a mountain fortress

Anyway, I got an idea what can be possibly causing the site inaccessibility: erosion. During my experiments with small worlds I've noticed that quite often mountain hall could be accessed only at one single land square (usually at corner), all squares around the mountain halls being somewhat lower. So if enough years passes after construction of mountain halls, erosion could lower the ground there, rendering the site inaccessible.
It's just a guess, of course, but at least it would explain, why I wasn't able to reproduce the problem on small worlds -- by default generation stops too early for erosion to do it's job.

So it could be important to wait all 1050 years of worldgen to reproduce the problem.
(0004241)
Footkerchief   
2010-04-19 09:47   
Cool, thanks for the thorough followup!
(0015640)
Footkerchief   
2011-03-01 14:05   
Mountain halls don't exist at all anymore, and will probably be drastically different when they come back, so I'm marking this report as suspended.