183 lines
5.6 KiB
Markdown
183 lines
5.6 KiB
Markdown
---
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title: 方块的生成条件
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category: 巧思案例
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tags:
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- 实验性
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mentions:
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- PavelDobCZ23
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- SmokeyStack
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- ThomasOrs
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---
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# 方块的生成条件
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<!--@include: @/wiki/bedrock-wiki-mirror.md-->
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有时你可能需要根据下方或上方的方块条件来放置特定特征。虽然多数生成特征本身不具备条件判断功能，但我们可以通过简单的技巧实现这个需求。
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:::tip
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本技巧利用了 `aggregate_feature` 和 `single_block_feature` 特征。若想了解更多相关内容，请参阅[特征类型](/wiki/world-generation/feature-types)文档。
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:::
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## 文件结构
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### 特征文件
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这个特征通过 `single_block_feature` 实现条件判断功能。我们可以保留这个占位方块（若不影响后续生成），但后续会将其替换为空气方块以避免干扰。该特征本质上是一个"虚拟"特征，因为我们只需要它的条件判断功能而不需要实际生成方块。
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::: code-group
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```json [BP/features/block_condition_feature.json]
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{
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"format_version": "1.18.0",
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"minecraft:single_block_feature": {
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"description": {
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"identifier": "wiki:block_condition_feature"
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},
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"places_block": "minecraft:cobblestone", //任何不在"may_replace"列表中的方块
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"enforce_placement_rules": false,
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"enforce_survivability_rules": false,
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"may_replace": ["minecraft:air"], //仅允许在特定方块上生成
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"may_attach_to": { //附着条件 - 特征生成时周围允许存在的方块
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"bottom": ["minecraft:grass"] //仅允许在草方块上方生成
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}
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}
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}
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//这个"虚拟"特征只允许在草方块正上方的空气方块位置生成
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```
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接下来的特征负责将圆石替换回原始空气方块。如果你选择保留占位方块或该方块不会造成干扰，可以省略此步骤。
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::: code-group
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```json [BP/features/block_replacement_feature.json]
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{
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"format_version": "1.18.0",
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"minecraft:single_block_feature": {
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"description": {
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"identifier": "wiki:block_replacement_feature"
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},
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"places_block": "minecraft:air", //将占位方块替换为无影响的方块
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"enforce_placement_rules": false,
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"enforce_survivability_rules": false,
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"may_replace": ["minecraft:cobblestone"] //前一个特征中使用的占位方块
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}
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}
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//此特征将占位方块替换回空气，避免后续生成问题
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```
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这个聚合特征按顺序执行：先放置条件判断方块，然后替换占位方块，最后生成实际特征。设置 `early_out` 为 `first_failure` 确保任一环节失败时立即终止流程。该特征通过特征规则调用。
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::: code-group
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```json [BP/features/aggregate_placement_rock_feature.json]
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{
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"format_version": "1.18.0",
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"minecraft:aggregate_feature": {
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"description": {
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"identifier": "wiki:aggregate_placement_rock_feature"
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},
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"features": [
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"wiki:block_condition_feature", //用于条件判断的虚拟特征
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"wiki:block_replacement_feature", //清理占位方块的特征
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//从此处开始添加需要条件生成的实际特征
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"wiki:rock_ore_feature"
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],
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"early_out": "first_failure" //任一特征失败则终止后续生成
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}
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}
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//该聚合特征按顺序执行所有子特征，由特征规则调用
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```
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这是需要条件生成的矿石特征示例。由于原生 `ore_feature` 无法直接设置生成条件，本技巧完美解决了这个问题。
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::: code-group
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```json [BP/features/rock_ore_feature.json]
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{
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"format_version": "1.18.0",
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"minecraft:ore_feature": {
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"description": {
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"identifier": "wiki:rock_ore_feature"
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},
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"count": 12,
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"replace_rules": [
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{
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"places_block": "minecraft:stone",
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"may_replace": ["minecraft:air","minecraft:grass"]
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},
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{
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"places_block": {
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"name": "minecraft:dirt",
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"states": {
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"dirt_type": "coarse"
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}
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},
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"may_replace": ["minecraft:dirt"]
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}
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]
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}
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}
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```
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:::
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:::tip
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若想深入了解矿石特征，请参考[自定义矿石生成](/wiki/world-generation/custom-ores)教程。
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:::
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### 特征规则
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::: code-group
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```json [BP/feature_rules/overworld_after_surface_rock_feature.json]
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{
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"format_version": "1.18.0",
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"minecraft:feature_rules": {
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"description": {
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"identifier": "wiki:overworld_after_surface_rock_feature",
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"places_feature": "wiki:aggregate_placement_rock_feature"
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},
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"conditions": {
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//在主世界生物群系的地表生成阶段后执行
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"placement_pass": "after_surface_pass",
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"minecraft:biome_filter": [
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{
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"any_of": [
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{
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"test": "has_biome_tag",
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"operator": "==",
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"value": "overworld"
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},
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{
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"test": "has_biome_tag",
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"operator": "==",
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"value": "overworld_generation"
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}
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]
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}
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]
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},
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"distribution": {
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//每个区块有1/3概率尝试生成1次
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"scatter_chance": 33,
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"iterations": 1,
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"coordinate_eval_order": "xzy",
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"x": {
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"distribution": "uniform",
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"extent": [0, 15]
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},
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//根据地势高度生成
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"y": "q.heightmap(v.worldx,v.worldz)",
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"z": {
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"distribution": "uniform",
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"extent": [0, 15]
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}
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}
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}
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}
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```
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## 总结
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通过本教程，你已经掌握了如何为任意特征添加方块生成条件。虽然示例较为基础，但此技巧可扩展应用于复杂场景，兼容所有特征类型。
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最终我们实现了一个仅在草方块上方空气位置生成的岩石特征。
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生成效果截图：
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