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[Immortal-D]

I'm attempting to create a world with an Evil Ocean, ideally bordering a Good-aligned Forest, but that's optional.  The result has been that I get 'Too many subregions' after a few tries, and when I ignore the error, the resulting world is a patchwork of half a dozen separate oceans, and small mountain ranges in the middle of every single landmass.  I don't know what is different between my settings and the standard Medium Region to cause such a significant disparity, but clearly I over-adjusted something.  Both the Subregion & Range lines are the same.  Any suggestions are welcome.

My World:

Spoiler (click to show/hide)

[WORLD_GEN]
   [TITLE:Clashing_Biomes]
   [DIM:129:129]
   [EMBARK_POINTS:1500]
   [END_YEAR:300]
   [BEAST_END_YEAR:300:-1]
   [REVEAL_ALL_HISTORY:1]
   [CULL_HISTORICAL_FIGURES:0]
   [ELEVATION:0:400:1800:1800]
   [RAINFALL:0:100:1800:1800]
   [TEMPERATURE:5:90:1800:1800]
   [DRAINAGE:0:100:1800:1800]
   [VOLCANISM:0:100:1500:1500]
   [SAVAGERY:0:100:2000:2000]
   [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]
   [POLE:NORTH_AND_OR_SOUTH]
   [MINERAL_SCARCITY:500]
   [MEGABEAST_CAP:500]
   [SEMIMEGABEAST_CAP:1000]
   [TITAN_NUMBER:500]
   [TITAN_ATTACK_TRIGGER:0:0:100000]
   [DEMON_NUMBER:100]
   [NIGHT_TROLL_NUMBER:50]
   [BOGEYMAN_NUMBER:50]
   [VAMPIRE_NUMBER:100]
   [WEREBEAST_NUMBER:250]
   [SECRET_NUMBER:100]
   [REGIONAL_INTERACTION_NUMBER:50]
   [DISTURBANCE_INTERACTION_NUMBER:50]
   [EVIL_CLOUD_NUMBER:50]
   [EVIL_RAIN_NUMBER:50]
   [GENERATE_DIVINE_MATERIALS:1]
   [GOOD_SQ_COUNTS:250:500:1000]
   [EVIL_SQ_COUNTS:250:500:1000]
   [PEAK_NUMBER_MIN:0]
   [PARTIAL_OCEAN_EDGE_MIN:0]
   [COMPLETE_OCEAN_EDGE_MIN:0]
   [VOLCANO_MIN:25]
   [REGION_COUNTS:SWAMP:0:0:0]
   [REGION_COUNTS:DESERT:0:0:0]
   [REGION_COUNTS:FOREST:0:0:0]
   [REGION_COUNTS:MOUNTAINS:0:0:0]
   [REGION_COUNTS:OCEAN:0:0:0]
   [REGION_COUNTS:GLACIER:0:0:0]
   [REGION_COUNTS:TUNDRA:0:0:0]
   [REGION_COUNTS:GRASSLAND:0:0:0]
   [REGION_COUNTS:HILLS:0:0:0]
   [EROSION_CYCLE_COUNT:150]
   [RIVER_MINS:0:0]
   [PERIODICALLY_ERODE_EXTREMES:0]
   [OROGRAPHIC_PRECIPITATION:1]
   [SUBREGION_MAX:2750]
   [CAVERN_LAYER_COUNT:3]
   [CAVERN_LAYER_OPENNESS_MIN:15]
   [CAVERN_LAYER_OPENNESS_MAX:90]
   [CAVERN_LAYER_PASSAGE_DENSITY_MIN:0]
   [CAVERN_LAYER_PASSAGE_DENSITY_MAX:70]
   [CAVERN_LAYER_WATER_MIN:15]
   [CAVERN_LAYER_WATER_MAX:90]
   [HAVE_BOTTOM_LAYER_1:1]
   [HAVE_BOTTOM_LAYER_2:1]
   [LEVELS_ABOVE_GROUND:25]
   [LEVELS_ABOVE_LAYER_1:10]
   [LEVELS_ABOVE_LAYER_2:3]
   [LEVELS_ABOVE_LAYER_3:3]
   [LEVELS_ABOVE_LAYER_4:3]
   [LEVELS_ABOVE_LAYER_5:2]
   [LEVELS_AT_BOTTOM:2]
   [CAVE_MIN_SIZE:10]
   [CAVE_MAX_SIZE:100]
   [MOUNTAIN_CAVE_MIN:15]
   [NON_MOUNTAIN_CAVE_MIN:25]
   [ALL_CAVES_VISIBLE:1]
   [SHOW_EMBARK_TUNNEL:2]
   [TOTAL_CIV_NUMBER:33]
   [TOTAL_CIV_POPULATION:15000]
   [SITE_CAP:1040]
   [PLAYABLE_CIVILIZATION_REQUIRED:1]
   [ELEVATION_RANGES:2080:4160:2080]
   [RAIN_RANGES:2080:4160:2080]
   [DRAINAGE_RANGES:2080:4160:2080]
   [SAVAGERY_RANGES:2080:4160:2080]
   [VOLCANISM_RANGES:2080:4160:2080]

Default Medium Region:

Spoiler (click to show/hide)

[WORLD_GEN]
   [TITLE:MEDIUM REGION]
   [DIM:129:129]
   [EMBARK_POINTS:1274]
   [END_YEAR:1050]
   [BEAST_END_YEAR:200:80]
   [REVEAL_ALL_HISTORY:1]
   [CULL_HISTORICAL_FIGURES:0]
   [ELEVATION:1:400:401:401]
   [RAINFALL:0:100:200:200]
   [TEMPERATURE:25:75:200:200]
   [DRAINAGE:0:100:200:200]
   [VOLCANISM:0:100:200:200]
   [SAVAGERY:0:100:200:200]
   [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]
   [POLE:NORTH_AND_OR_SOUTH]
   [MINERAL_SCARCITY:600]
   [MEGABEAST_CAP:18]
   [SEMIMEGABEAST_CAP:37]
   [TITAN_NUMBER:9]
   [TITAN_ATTACK_TRIGGER:80:0:100000]
   [DEMON_NUMBER:28]
   [NIGHT_TROLL_NUMBER:14]
   [BOGEYMAN_NUMBER:14]
   [VAMPIRE_NUMBER:14]
   [WEREBEAST_NUMBER:14]
   [SECRET_NUMBER:28]
   [REGIONAL_INTERACTION_NUMBER:28]
   [DISTURBANCE_INTERACTION_NUMBER:28]
   [EVIL_CLOUD_NUMBER:14]
   [EVIL_RAIN_NUMBER:14]
   [GENERATE_DIVINE_MATERIALS:1]
   [GOOD_SQ_COUNTS:25:251:503]
   [EVIL_SQ_COUNTS:25:251:503]
   [PEAK_NUMBER_MIN:12]
   [PARTIAL_OCEAN_EDGE_MIN:1]
   [COMPLETE_OCEAN_EDGE_MIN:0]
   [VOLCANO_MIN:3]
   [REGION_COUNTS:SWAMP:260:1:1]
   [REGION_COUNTS:DESERT:260:1:1]
   [REGION_COUNTS:FOREST:1040:3:3]
   [REGION_COUNTS:MOUNTAINS:2080:2:2]
   [REGION_COUNTS:OCEAN:2080:1:1]
   [REGION_COUNTS:GLACIER:0:0:0]
   [REGION_COUNTS:TUNDRA:0:0:0]
   [REGION_COUNTS:GRASSLAND:2080:3:3]
   [REGION_COUNTS:HILLS:2080:3:3]
   [EROSION_CYCLE_COUNT:250]
   [RIVER_MINS:100:100]
   [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_MAX_SIZE:25]
   [MOUNTAIN_CAVE_MIN:25]
   [NON_MOUNTAIN_CAVE_MIN:50]
   [ALL_CAVES_VISIBLE:0]
   [SHOW_EMBARK_TUNNEL:2]
   [TOTAL_CIV_NUMBER:40]
   [TOTAL_CIV_POPULATION:15000]
   [SITE_CAP:1040]
   [PLAYABLE_CIVILIZATION_REQUIRED:1]
   [ELEVATION_RANGES:2080:4160:2080]
   [RAIN_RANGES:2080:4160:2080]
   [DRAINAGE_RANGES:2080:4160:2080]
   [SAVAGERY_RANGES:2080:4160:2080]
   [VOLCANISM_RANGES:2080:4160:2080]

[feelotraveller]

To work around the subregion rejection message increase allowed subregion count:
SUBREGION_MAX:5000

A change in good/evil changes biome = new subregion.

To reduce the number of subregions generated you will need to reduce variation somewhere, probably the X and Y variance of Elevation, Rainfall, Temperature, Drainage, Volcanism, Savagery ('and/or' for them all...) that is the third and fourth parameters for each.  (Of course reducing desired good/evil counts would also have this effect, although perhaps counterproductive to your goal otherwise.)

Might also want to think about increasing the second parameter for Elevation_Frequency to get a greater proportion of oceans. (Specify the grid size with the first parameter.) Similarly if there are too many mountains for your liking try increasing the values of parameters 2-5 (other than the first these are ratios) but not the 6th.

[Immortal-D]

To work around the subregion rejection message increase allowed subregion count:
SUBREGION_MAX:5000

A change in good/evil changes biome = new subregion.

To reduce the number of subregions generated you will need to reduce variation somewhere, probably the X and Y variance of Elevation, Rainfall, Temperature, Drainage, Volcanism, Savagery ('and/or' for them all...) that is the third and fourth parameters for each.  (Of course reducing desired good/evil counts would also have this effect, although perhaps counterproductive to your goal otherwise.)

Might also want to think about increasing the second parameter for Elevation_Frequency to get a greater proportion of oceans. (Specify the grid size with the first parameter.) Similarly if there are too many mountains for your liking try increasing the values of parameters 2-5 (other than the first these are ratios) but not the 6th.

I was under the impression that increasing Subregion_Max could result in the same error, but if it's actually a theoretical cap, then maxing it out makes sense.  I didn't know that Good & Evil counted as subregions, I thought it was limited to basic biome types like swamp & grasslands.  That would certainly explain why I went over the limit when combined with a 50% variance on all other settings.  Never messed with the Frequency before, I'll definitely see what those can accomplish.  I really appreciate the info

[feelotraveller]

You may be right that it is still possible to get the error with the increased cap.  Practically though the worldgen you posted did not return the error once I increased the cap.

[PatrikLundell]

Good/Neutral/Evil is applied to a complete region by DF (although you can hack individual world tiles to have different alignments). DF creates regions first and assign alignment in a later world gen step. Savagery is a true tile property, so a region may have all variants, and the same goes for tropical/temperate/arctic, where a region can span all variants. Same type biomes count as the same region as long as the tiles form a perpendicularly contiguous area, with the exception of the "grassland" biomes, which are split into "flat" and "hilly" based on drainage.

[Immortal-D]

You may be right that it is still possible to get the error with the increased cap.  Practically though the worldgen you posted did not return the error once I increased the cap.

Yeah, the subregion error is no longer an issue.

Good/Neutral/Evil is applied to a complete region by DF (although you can hack individual world tiles to have different alignments). DF creates regions first and assign alignment in a later world gen step. Savagery is a true tile property, so a region may have all variants, and the same goes for tropical/temperate/arctic, where a region can span all variants. Same type biomes count as the same region as long as the tiles form a perpendicularly contiguous area, with the exception of the "grassland" biomes, which are split into "flat" and "hilly" based on drainage.

Fascinating.  I didn't see any DFHack commands for changing a world tile's alignment.  Is that something done in Perfect World?  If I could change a tile's alignment, that would simplify matters greatly, especially now that I've gotten Perfect World to reliably create Tropical regions where I want them.