93 lines
2.6 KiB
Markdown
93 lines
2.6 KiB
Markdown
---
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front: https://nie.res.netease.com/r/pic/20211104/69055361-2e7a-452f-8b1a-f23e1262a03a.jpg
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hard: 高级
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time: 10分钟
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---
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# 了解自定义散植特征规则
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我们继续使用上一节的蓝色蕨方块来编写散植特征。我们希望在世界中生成更多的蓝色蕨，使其形成一个簇。
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## 设置蕨类散植特征
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我们在特征文件夹中建立`blue_fern_cluster_feature.json`文件。
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```json
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{
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"format_version": "1.13.0",
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"minecraft:scatter_feature": {
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"description": {
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"identifier": "tutorial_demo:blue_fern_cluster_feature"
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},
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"places_feature": "tutorial_demo:blue_fern_feature",
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"iterations": 10,
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"scatter_chance": 50.0,
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"x": {
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"distribution": "uniform",
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"extent": [ 0, 5 ]
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},
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"y": 0,
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"z": {
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"distribution": "uniform",
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"extent": [ 0, 5 ]
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}
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}
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}
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```
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注意，在命名上我们习惯于将均匀分布的植物群体称为一个**簇**（**Cluster**），而高斯分布的植物群系称为一个**斑块**（**Patch**）。当然，对于游戏引擎本身来说，命名或许没那么重要，但是对于可读性而言，一个良好的命名还是必需的。
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散植特征在放置时，只要至少一次迭代中的目标特征成功放置就会判定成功，全部迭代的目标特征全部失败就会判定失败。
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## 挂接特征规则
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我们在特征规则文件夹中新建`overworld_blue_fern_cluster_feature.json`文件。
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```json
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{
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"format_version": "1.13.0",
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"minecraft:feature_rules": {
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"description": {
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"identifier": "tutorial_demo:overworld_blue_fern_cluster_feature",
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"places_feature": "tutorial_demo:blue_fern_cluster_feature"
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},
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"conditions": {
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"placement_pass": "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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"iterations": 5,
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"x": {
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"distribution": "uniform",
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"extent": [ 0, 16 ]
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},
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"y": "query.heightmap(variable.worldx, variable.worldz)",
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"z": {
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"distribution": "uniform",
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"extent": [ 0, 16 ]
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}
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}
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}
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}
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```
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我们迭代5次，加之以特征本身有50%的概率放置，相当于我们平均在一个区块中放置2.5个蓝色蕨簇。
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可以看到，生成符合我们的预期！ |