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Crystal Spikes

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Crystal Spikes

By Davemane42

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A NeoForge 1.21.1 mod that adds a highly configurable, datapack-driven crystal spike worldgen feature with geode-style block providers and a custom placement modifier for finding terrain undersides.

Mod Loaders
Minecraft
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About

Description

Crystal Spikes

A NeoForge 1.21.1 mod that adds a highly configurable, datapack-driven crystal spike worldgen feature with geode-style block providers and a custom placement modifier for finding terrain undersides.

Amethyst spike

Feature: crystalspikes:crystal_spike

Configured feature JSON (data/<namespace>/worldgen/configured_feature/<name>.json):

Field Type Default Description
core BlockStateProvider required Spike interior blocks (can be air/water for a hollow spike)
outer_layer BlockStateProvider required Spike shell blocks — applied to spike blocks exposed to space outside the spike
surface_decorator BlockStateProvider (none) Blocks attached to the shell's top/bottom faces (e.g. clusters, buds, coral). facing/waterlogged are set automatically
wall_decorator BlockStateProvider surface_decorator Blocks attached to the shell's horizontal faces (e.g. coral wall fans). Falls back to surface_decorator when absent
base BlockStateProvider calcite Blocks that replace exposed anchor blocks around the spike base and roots
base_radius IntProvider (1–32) required Spike base radius
direction list of directions required Main growth direction(s); one is picked at random per spike (up, down, north, south, east, west)
min_angle / max_angle float (0–180) 0 Random tilt range away from the main direction, in degrees. 0 = straight along direction
slope_angle FloatProvider (0–85) 26.565 Cone half-angle in degrees; controls how fast the spike tapers (26.565° = 1:2 taper). 0 = cylinder
height IntProvider (1–256) derived Spike length along its axis; defaults to the natural cone length radius / tan(slope_angle)
root_depth int (0–64) 4 How far roots extend from the base back toward the mounting surface, so spikes on slopes/ledges don't float. 0 disables
decorator_chance float (0–1) 0.1667 Chance per shell block to roll decoration
decorator_face_chance float (0–1) 0.5 Chance per open face of a rolled shell block
anchor_tag Block tag minecraft:base_stone_overworld Blocks the spike can anchor to (and that base may replace)

Notes:

  • All BlockStateProvider fields accept any vanilla provider, e.g. simple_state_provider or weighted_state_provider for mixed blocks within one spike.
  • Decorators are only placed where they can survive (canSurvive), so e.g. sea pickles only land on coral blocks and floor fans never float sideways.

Example

{
  "type": "crystalspikes:crystal_spike",
  "config": {
    "core": {
      "type": "minecraft:simple_state_provider",
      "state": { "Name": "minecraft:calcite" }
    },
    "outer_layer": {
      "type": "minecraft:weighted_state_provider",
      "entries": [
        { "weight": 4, "data": { "Name": "minecraft:amethyst_block" } },
        { "weight": 1, "data": { "Name": "minecraft:budding_amethyst" } }
      ]
    },
    "surface_decorator": {
      "type": "minecraft:weighted_state_provider",
      "entries": [
        { "weight": 3, "data": { "Name": "minecraft:amethyst_cluster" } },
        { "weight": 1, "data": { "Name": "minecraft:large_amethyst_bud" } }
      ]
    },
    "base": {
      "type": "minecraft:simple_state_provider",
      "state": { "Name": "minecraft:basalt" }
    },
    "base_radius": { "type": "minecraft:uniform", "min_inclusive": 2, "max_inclusive": 4 },
    "direction": ["up"],
    "min_angle": 0.0,
    "max_angle": 20.0,
    "slope_angle": { "type": "minecraft:uniform", "min_inclusive": 22.0, "max_exclusive": 30.0 },
    "root_depth": 4,
    "decorator_chance": 0.1667,
    "decorator_face_chance": 0.5
  }
}

Examples

Complete working datapacks (configured feature, placed feature, biome modifier, anchor tags) are in example/datapack/
Bubble coral spike Bubble and fire coral spikes
GeOre end spike

Placement modifier: crystalspikes:under_island

Finds anchor blocks on the underside of terrain (blocks in anchor_tag with air/water/lava below them) — made for hanging spikes under floating islands, without vanilla's 32-step environment_scan limit.

Field Type Default Description
anchor_tag Block tag minecraft:base_stone_overworld Blocks that count as anchors
min_y / max_y int dimension bounds Y range to scan
selection "random" / "lowest" / "highest" "random" Which candidate in the column to use

Example

{
  "feature": "example:my_spike",
  "placement": [
    { "type": "minecraft:rarity_filter", "chance": 8 },
    { "type": "minecraft:count", "count": { "type": "minecraft:uniform", "min_inclusive": 4, "max_inclusive": 8 } },
    { "type": "minecraft:in_square" },
    { "type": "crystalspikes:under_island", "anchor_tag": "example:end_stones", "min_y": 0, "max_y": 128 },
    { "type": "minecraft:biome" }
  ]
}

For surface placement, vanilla's heightmap + environment_scan (down) works fine. See the coral spikes in the example datapack.