hbmspace:surface_depth

The condition holds when the depth below the surface is at most 1 + d, with per-column depth d = \lfloor n \times 8.25 / \mathrm{divisor} + \mathrm{divisor} + r \times \mathrm{jitter} \rfloor from the vanilla minecraft:surface noise n and a positional random r. Use it as if_true of a minecraft:condition rule in material_rule.

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From data/hbmspace/worldgen/noise_settings/duna.json:

{"type": "hbmspace:surface_depth", "divisor": 6.0, "jitter": 0.85}