3a255b52e1
The bandlands rule cycled four terracotta colours off a per-column random draw. Vanilla generates a 192-entry band table once per world, from a random source named clay_bands, and reads it at the block's height shifted by the clay_bands_offset noise. Brown, red and light grey terracotta were never placed anywhere; the stripes were the wrong thickness and did not line up between neighbouring columns. All seven colours now appear. The temperature condition matched a hand-written list of eleven biome names. Replacing it with the temperature field read out of the jar's 65 biome JSONs fixes one of them: deep_frozen_ocean reads cold by name but its base temperature is 0.5, so vanilla does not freeze it. taiga and the pine taigas were the other way round -- excluded by name, and correctly so, but by coincidence rather than by data. Two parts of the vanilla calculation are left out and documented where they belong: the height adjustment that cools peaks, and the "frozen" modifier that warms scattered patches of frozen ocean. Both need PerlinSimplexNoise. Neither is reachable from the overworld tree in a way that shows: the single condition that consults temperature sits under a frozen_ocean biome check, below a water check, and decides whether a hole in the ocean floor ices over. The snowy mountain tops come from biome selection, not from here -- which is not what the plan for this commit assumed. The per-column *rand.Rand threaded through SurfaceContext goes away with the old bandlands rule; nothing needs it now that vertical_gradient rolls positionally.
99 lines
4.3 KiB
Go
99 lines
4.3 KiB
Go
package worldgen
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// biome_temperature.go holds each overworld biome's base temperature, extracted
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// verbatim from the "temperature" field of data/minecraft/worldgen/biome/*.json
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// inside the 26.1.2 server jar. It replaces a hand-written list of biome names
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// that guessed at which ones were cold.
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//
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// The surface rule tree consults it through exactly one condition
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// (minecraft:temperature), which decides whether a hole in a frozen ocean floor
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// freezes over.
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// biomeTemperature maps a biome to Biome.getBaseTemperature().
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var biomeTemperature = map[string]float32{
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"minecraft:badlands": 2.0,
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"minecraft:bamboo_jungle": 0.95,
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"minecraft:basalt_deltas": 2.0,
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"minecraft:beach": 0.8,
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"minecraft:birch_forest": 0.6,
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"minecraft:cherry_grove": 0.5,
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"minecraft:cold_ocean": 0.5,
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"minecraft:crimson_forest": 2.0,
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"minecraft:dark_forest": 0.7,
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"minecraft:deep_cold_ocean": 0.5,
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"minecraft:deep_dark": 0.8,
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"minecraft:deep_frozen_ocean": 0.5, // temperature_modifier: frozen
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"minecraft:deep_lukewarm_ocean": 0.5,
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"minecraft:deep_ocean": 0.5,
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"minecraft:desert": 2.0,
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"minecraft:dripstone_caves": 0.8,
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"minecraft:end_barrens": 0.5,
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"minecraft:end_highlands": 0.5,
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"minecraft:end_midlands": 0.5,
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"minecraft:eroded_badlands": 2.0,
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"minecraft:flower_forest": 0.7,
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"minecraft:forest": 0.7,
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"minecraft:frozen_ocean": 0.0, // temperature_modifier: frozen
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"minecraft:frozen_peaks": -0.7,
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"minecraft:frozen_river": 0.0,
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"minecraft:grove": -0.2,
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"minecraft:ice_spikes": 0.0,
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"minecraft:jagged_peaks": -0.7,
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"minecraft:jungle": 0.95,
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"minecraft:lukewarm_ocean": 0.5,
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"minecraft:lush_caves": 0.5,
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"minecraft:mangrove_swamp": 0.8,
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"minecraft:meadow": 0.5,
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"minecraft:mushroom_fields": 0.9,
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"minecraft:nether_wastes": 2.0,
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"minecraft:ocean": 0.5,
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"minecraft:old_growth_birch_forest": 0.6,
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"minecraft:old_growth_pine_taiga": 0.3,
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"minecraft:old_growth_spruce_taiga": 0.25,
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"minecraft:pale_garden": 0.7,
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"minecraft:plains": 0.8,
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"minecraft:river": 0.5,
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"minecraft:savanna": 2.0,
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"minecraft:savanna_plateau": 2.0,
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"minecraft:small_end_islands": 0.5,
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"minecraft:snowy_beach": 0.05,
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"minecraft:snowy_plains": 0.0,
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"minecraft:snowy_slopes": -0.3,
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"minecraft:snowy_taiga": -0.5,
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"minecraft:soul_sand_valley": 2.0,
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"minecraft:sparse_jungle": 0.95,
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"minecraft:stony_peaks": 1.0,
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"minecraft:stony_shore": 0.2,
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"minecraft:sunflower_plains": 0.8,
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"minecraft:swamp": 0.8,
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"minecraft:taiga": 0.25,
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"minecraft:the_end": 0.5,
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"minecraft:the_void": 0.5,
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"minecraft:warm_ocean": 0.5,
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"minecraft:warped_forest": 2.0,
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"minecraft:windswept_forest": 0.2,
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"minecraft:windswept_gravelly_hills": 0.2,
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"minecraft:windswept_hills": 0.2,
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"minecraft:windswept_savanna": 2.0,
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"minecraft:wooded_badlands": 2.0,
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}
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// coldEnoughToSnow is Biome.coldEnoughToSnow: below 0.15 the biome gets snow
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// and ice rather than rain.
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//
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// Two parts of vanilla's calculation are not reproduced, both because they need
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// PerlinSimplexNoise, which we do not have:
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//
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// - the height adjustment, which cools a column above sea level + 17 and so
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// puts snow on peaks in otherwise temperate biomes. No rule in the
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// overworld tree reaches this condition above that height.
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// - the "frozen" temperature modifier, which warms scattered patches of
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// frozen_ocean and deep_frozen_ocean. Its absence makes frozen-ocean ice
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// uniform where vanilla leaves open water in it.
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//
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// An unknown biome reads as warm, which is the safe direction: it leaves the
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// default block alone rather than icing something over.
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func coldEnoughToSnow(biome string) bool {
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temperature, ok := biomeTemperature[biome]
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return ok && temperature < 0.15
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}
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