Surface Rules

// Example: how to build a surface_rule using surface_rules.pkl helpers.
// Paste this surface_rule value into your noise_settings amend file.
//
// Pattern: bedrock floor → grass on top → dirt layer → stone everywhere else

import "pklmc:surface_rules.pkl" as sr

// This module just exports the rule object - evaluate it to get JSON you can
// embed in a noise_settings file as the surface_rule value.
local rule: sr.SequenceRule = new {
  sequence = new Listing {

    // Bedrock at the very bottom (probabilistic gradient)
    new sr.ConditionRule {
      if_true = new sr.VerticalGradientCondition {
        random_name = "mymod:bedrock_floor"
        true_at_and_below = new sr.AboveBottomAnchor { above_bottom = 0 }
        false_at_and_above = new sr.AboveBottomAnchor { above_bottom = 5 }
      }
      then_run = new sr.BlockRule { result_state { Name = "minecraft:bedrock" } }
    }

    // Above preliminary surface: grass on top, dirt below surface, stone beneath
    new sr.ConditionRule {
      if_true = new sr.AbovePreliminarySurface {}
      then_run = new sr.SequenceRule {
        sequence = new Listing {
          // Top surface block: grass
          new sr.ConditionRule {
            if_true = new sr.StoneDepthCondition {
              offset = 0
              surface_type = "floor"
              add_surface_depth = false
              secondary_depth_range = 0
            }
            then_run = new sr.BlockRule { result_state { Name = "minecraft:grass_block"; Properties { ["snowy"] = "false" } } }
          }
          // Dirt layer (4 blocks deep)
          new sr.ConditionRule {
            if_true = new sr.StoneDepthCondition {
              offset = 0
              surface_type = "floor"
              add_surface_depth = true
              secondary_depth_range = 0
            }
            then_run = new sr.BlockRule { result_state { Name = "minecraft:dirt" } }
          }
        }
      }
    }

    // Everything else: stone
    new sr.BlockRule { result_state { Name = "minecraft:stone" } }
  }
}

output { renderer = new JsonRenderer {}; value = rule }