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[Kate Wissen]

It seems the forums are filled with stories of 100+ z-levels. Yet I have not found a single embark location near those numbers. I know you can push the caverns down with using the advanced parameters, but why would it not be occurring naturally.

Currently I'm finding 35-45 z-levels with the occasional 55. What could be the reason, other than I'm extremely unlucky and keep finding areas close to the 'basement'?

[Proteus]

Increase
"z-levels between layer x"

for all the layers...+
but be warned...the more z-levels you use,
the more processor power your game needs
(and the slower it will become )

[puke]

even in unmodified world-gen, you should find some pretty deep areas.  maybe you are always embarking in the lowlands or near an ocean or something, and the deep areas are by the mountains?  I almost always do mountain (or volcano) embarks, and mine are usually pretty deep.

[JAFANZ]

It's probably essentially what puke said.

The closer you are to Oceans & Lakes, the fewer z-levels you're likely to see, go closer to Mountains, Peaks & Volcano for more.

I suspect Rivers reduce depth as well.

[Kate Wissen]

Hmm, not working out. I have a theory, it needs testing.
Would anyone be willing to post a worldgen and a site where they know has high z-levels?

[Rose]

uh..... that myth about oceans reducing Z levels?

Spoiler: Bull (click to show/hide)

[JAFANZ]

Hmm, not working out. I have a theory, it needs testing.
Would anyone be willing to post a worldgen and a site where they know has high z-levels?

Spoiler: WorldGen (click to show/hide)

[WORLD_GEN]
   [TITLE:WINDCRESTED]
   [SEED:323054416]
   [HISTORY_SEED:3774515824]
   [NAME_SEED:2838237693]
   [CREATURE_SEED:2645033792]
   [DIM:65:65]
   [EMBARK_POINTS:1274]
   [END_YEAR:499]
   [BEAST_END_YEAR:2:80]
   [REVEAL_ALL_HISTORY:1]
   [CULL_HISTORICAL_FIGURES:0]
   [ELEVATION:1:400:3200:3200]
   [RAINFALL:50:100:3200:3200]
   [TEMPERATURE:35:35:0:0]
   [DRAINAGE:0:100:3200:3200]
   [VOLCANISM:0:100:3200:3200]
   [SAVAGERY:0:100:3200:3200]
   [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:1:2000:1:1:1:2000]
   [TITAN_NUMBER:3]
   [TITAN_ATTACK_TRIGGER:80:0:100000]
   [DEMON_NUMBER:22]
   [GOOD_SQ_COUNTS:300:3000:4225]
   [EVIL_SQ_COUNTS:1:5:12]
   [PEAK_NUMBER_MIN:3]
   [PARTIAL_OCEAN_EDGE_MIN:0]
   [COMPLETE_OCEAN_EDGE_MIN:0]
   [VOLCANO_MIN:200]
   [REGION_COUNTS:SWAMP:66:0:0]
   [REGION_COUNTS:DESERT:66:0:0]
   [REGION_COUNTS:FOREST:264:0:0]
   [REGION_COUNTS:MOUNTAINS:528:0:0]
   [REGION_COUNTS:OCEAN:0:0:0]
   [REGION_COUNTS:GLACIER:0:0:0]
   [REGION_COUNTS:TUNDRA:0:0:0]
   [REGION_COUNTS:GRASSLAND:528:0:0]
   [REGION_COUNTS:HILLS:528:0:0]
   [EROSION_CYCLE_COUNT:250]
   [RIVER_MINS:600:400]
   [PERIODICALLY_ERODE_EXTREMES:1]
   [OROGRAPHIC_PRECIPITATION:1]
   [SUBREGION_MAX:5000]
   [CAVERN_LAYER_COUNT:3]
   [CAVERN_LAYER_OPENNESS_MIN:95]
   [CAVERN_LAYER_OPENNESS_MAX:100]
   [CAVERN_LAYER_PASSAGE_DENSITY_MIN:0]
   [CAVERN_LAYER_PASSAGE_DENSITY_MAX:5]
   [CAVERN_LAYER_WATER_MIN:0]
   [CAVERN_LAYER_WATER_MAX:30]
   [HAVE_BOTTOM_LAYER_1:1]
   [HAVE_BOTTOM_LAYER_2:1]
   [LEVELS_ABOVE_GROUND:15]
   [LEVELS_ABOVE_LAYER_1:10]
   [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:6]
   [NON_MOUNTAIN_CAVE_MIN:12]
   [ALL_CAVES_VISIBLE:1]
   [SHOW_EMBARK_TUNNEL:2]
   [TOTAL_CIV_NUMBER:20]
   [TOTAL_CIV_POPULATION:15000]
   [PLAYABLE_CIVILIZATION_REQUIRED:1]
   [ELEVATION_RANGES:528:1056:528]
   [RAIN_RANGES:264:528:264]
   [DRAINAGE_RANGES:264:528:264]
   [SAVAGERY_RANGES:264:528:264]
   [VOLCANISM_RANGES:264:528:264]

Map is in the 1st spoiler in the 1st post of this thread

Note: Japa, there's a reason I said  "likely", the game uses the RNG too much for me consider any 'Rule' to be truly hard & fast.

[Kate Wissen]

The world is being constantly rejected for rainfall.

[JAFANZ]

The world is being constantly rejected for rainfall.

Sorry, I forgot to mention that you need to hit "p" when the massive rejections prompt comes up to get the world on the map.

[Kate Wissen]

The world worked and the location has 151 z-levels below the surface. Looks like I'm just really bad at picking appropriate embark locations. Thanks for your help.

[Khift]

From what little testing I did earlier while finding a new embark with specifically shallow z-level count (to see if it increased FPS), I found that by and large z-level count was determined by how much space the feature's asked for. If your features asked for the normal amount of space you end up with ~60 z-levels of rock on normal elevation. High and low elevation was worth rougly +/- 20 z-levels, respectively. However, if an underground feature asked for more space, the map would add additional z-levels for that feature. The largest offenders with this regard appear to be adamantine spires; a map with small spires are half or less the size of a map with large adamantine spires.

In short: Increasing the z-levels between layers count will work, but even with out different embarks within the same world will have wildly different amount of z-levels depending on the size of the layers.