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Match vanilla placement height sampling

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This commit is contained in:
Daniar Mannanov 2026-08-11 09:42:11 +03:00
parent e9fe526300
commit 674d0192c9
2 changed files with 30 additions and 7 deletions
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20
internal/worldgen/features.go
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@ -176,18 +176,24 @@ func (p PlacementPlan) SampleY(r RandomSource, minY, height int) int {
}
span := hi - lo + 1
if p.HeightDistribution == "minecraft:trapezoid" {
plateau := 0
triangle := span - plateau
return lo + int(r.NextIntN(int32((triangle+1)/2))) + int(r.NextIntN(int32(triangle/2+1)))
// Vanilla's TrapezoidHeight works with the inclusive range distance,
// then performs two inclusive random draws around the midpoint.
rangeSize := span - 1
if rangeSize <= 0 {
return lo
}
left := rangeSize / 2
right := rangeSize - left
return lo + int(r.NextIntN(int32(right+1))) + int(r.NextIntN(int32(left+1)))
}
if p.HeightDistribution == "minecraft:very_biased_to_bottom" {
const inner = 8
outer := span - inner + 1
if outer <= 0 {
if span-inner <= 0 {
return lo
}
bound := int(r.NextIntN(int32(outer))) + inner
return lo + int(r.NextIntN(int32(bound)))
first := lo + inner + int(r.NextIntN(int32(span-inner)))
second := lo + int(r.NextIntN(int32(first-lo)))
return lo + int(r.NextIntN(int32(second-lo+inner)))
}
return lo + int(r.NextIntN(int32(span)))
}