92 lines
2.7 KiB
Markdown
92 lines
2.7 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: 15分钟
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---
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# 了解搜索特征规则
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本节中，我们继续一起了解搜索特征。我们尝试使用搜索特征为我们的橡树附着上我们之前在第十章中制作的自定义苹果方块，使其形成一个会结果实的橡树。
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## 设置苹果单方块特征
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我们还记得，我们的方块标识符为`tutorial_demo:apple`。我们新建一个单方块特征`apple_feature.json`。
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```json
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{
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"format_version": "1.13.0",
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"minecraft:single_block_feature": {
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"description": {
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"identifier": "tutorial_demo:apple_feature"
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},
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"places_block": "tutorial_demo:custom_apple",
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"enforce_survivability_rules": true,
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"enforce_placement_rules": true,
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"may_attach_to": {
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"auto_rotate": false,
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"min_sides_must_attach": 2,
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"top": {
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"name": "minecraft:leaves",
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"states": {
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"old_leaf_type": "oak"
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}
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},
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"west": {
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"name": "minecraft:leaves",
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"states": {
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"old_leaf_type": "oak"
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}
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},
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"north": {
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"name": "minecraft:leaves",
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"states": {
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"old_leaf_type": "oak"
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}
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},
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"east": {
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"name": "minecraft:leaves",
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"states": {
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"old_leaf_type": "oak"
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}
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},
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"south": {
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"name": "minecraft:leaves",
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"states": {
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"old_leaf_type": "oak"
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}
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}
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},
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"may_replace": [
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"minecraft:air"
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]
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}
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}
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```
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这里我们为其进行了严格的替换设置。我们期望一个苹果在上、前、后、左、右五个方向上至少有两个方向是连接像树叶的。这样，我们的苹果才会看起来是挂在橡树上一样，不至于特别突兀。
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## 使用搜索特征连接苹果特征
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我们新建`apple_search_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:search_feature": {
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"description": {
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"identifier": "tutorial_demo:apple_search_feature"
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},
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"places_feature": "tutorial_demo:apple_feature",
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"search_volume": {
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"min": [ -4, -16, -4 ],
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"max": [ 4, 0, 4 ]
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},
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"search_axis": "-y",
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"required_successes": 1
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}
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}
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```
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我们这里从输入位置开始向Y轴负方向也就是向下开始搜索，当成功获取一个能够使苹果单方块特征`tutorial_demo:apple_feature`的位置时便停止搜索并放置该单方块特征。当找到的“能够使要放置的特征成功”的位置少于`required_successes`的数值时就会使该搜索特征放置判定失败。
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我们在下一节中继续通过序列特征实现该搜索特征的放置。 |