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Placement modifiers

NTM modifiers for placed-feature positions and generation gates.

Modifier types

The ordered placement array in data/<namespace>/worldgen/placed_feature/<path>.json selects each modifier by type.

TypeEffect
hbm:light_blocking_heightMoves each position to the light-blocking terrain surface.
hbm:world_configPasses while every named world-generation switch is enabled.
hbm:ore_hostSkips an ore chain where its host cannot occur within reach.

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