完整版BedrockWiki镜像！
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boybook
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docs/wiki/entities/detecting-other-entities.md
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docs/wiki/entities/detecting-other-entities.md
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---
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title: 侦测其他实体
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category: 巧思案例
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tags:
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- 中级
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mentions:
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- ANightDazingZoroark
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- SmokeyStack
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- MedicalJewel105
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- SirLich
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- Luthorius
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- TheItsNameless
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---
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# 侦测其他实体
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<!--@include: @/wiki/bedrock-wiki-mirror.md-->
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当需要让实体在附近存在其他实体时触发事件，本文将详细介绍多种已知实现方式。
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## minecraft:entity_sensor
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这是最基础的侦测方式。主要限制是只能接收单一条目，且检测实体退出范围较困难。作为实体组件，可直接植入实体行为文件并配置Minecraft过滤器：
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::: code-group
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```json [BP/entities/my_entity.json#components]
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"minecraft:entity_sensor": {
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"sensor_range": 2.5, //检测半径（格子数）
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"relative_range": false, //若为true，检测范围会叠加实体碰撞箱
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"require_all": true, //若为true，所有邻近实体需通过过滤条件才会触发事件
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"minimum_count": 1, //触发事件的最小实体数量（默认1）
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"maximum_count": 4, //触发事件的最大实体数量（默认-1表示无限）
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"event_filters": { //自定义过滤器（本例检测玩家）
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"test": "is_family",
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"subject": "other",
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"value": "player"
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},
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"event": "event:on_player_detected" //条件满足时触发的事件
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}
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```
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:::
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## `/execute` 命令
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使用1.19.50版本新增的`/execute`命令，可在附近存在实体时执行指令。以下示例使猪在检测到玩家时发出"oink oink"声（可自定义事件）：
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::: code-group
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```json [BP/animations/detection_animation.json]
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{
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"format_version": "1.10.0",
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"animations": {
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"animation.pig.find_player": {
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"animation_length": 0.05,
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"loop": true,
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"timeline": {
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"0": [
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"/execute as @s if entity @e[type=player, r=4] run event entity @s wiki:player_detected"
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]
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}
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},
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"animation.pig.find_no_player": {
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"animation_length": 0.05,
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"loop": true,
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"timeline": {
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"0": [
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"/execute as @s unless entity @e[type=player, r=4] run event entity @s wiki:no_player_detected"
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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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:::
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首个动画用于检测实体存在，第二个检测实体离开。可通过`/event`命令添加[虚拟组件](/wiki/entities/dummy-components)或更新[实体属性](https://learn.microsoft.com/zh-cn/minecraft/creator/documents/introductiontoentityproperties)。
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::: code-group
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```json [BP/animation_controllers/pig_animation_controllers.json]
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{
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"format_version": "1.10.0",
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"animation_controllers": {
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"controller.animation.pig_find_player": {
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"initial_state": "default",
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"states": {
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"default": {
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"animations": ["find_player"],
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"transitions": [{
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"detected": "q.is_sheared"
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}]
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},
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"detected": {
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"animations": ["find_no_player"],
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"transitions": [{
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"default": "!q.is_sheared"
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}],
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"on_entry": ["/say oink oink"]
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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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:::
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::: code-group
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```json [BP/entities/my_entity.json#description]
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"animations": {
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"manage_find_player": "controller.animation.pig_find_player",
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"find_player": "animation.pig.find_player",
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"find_no_player": "animation.pig.find_no_player"
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},
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"scripts": {
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"animate": ["manage_find_player"]
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}
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```
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:::
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## Molang、动画与动画控制器
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使用`for_each`函数配合`q.get_nearby_entities`或`q.get_nearby_entities_except_self`可更高效检测实体（实验性功能），能更好处理实体离开的情况。
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::: code-group
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```json [BP/animations/detection_animation.json]
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{
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"format_version": "1.10.0",
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"animations": {
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"animation.pig.find_player": {
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"animation_length": 0.05,
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"loop": true,
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"timeline": {
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"0": [
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"v.x = 0.0; for_each(t.player, q.get_nearby_entities_except_self(16, 'minecraft:player'), { v.x = v.x + 1; }); return v.x > 0.0;"
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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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:::
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若要检测具备特定Molang属性的实体：
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::: code-group
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```json [BP/animations/detection_animation.json]
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{
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"format_version": "1.10.0",
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"animations": {
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"animation.pig.find_player": {
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"animation_length": 0.05,
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"loop": true,
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"timeline": {
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"0": [
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"v.x = 0.0; for_each(t.player, q.get_nearby_entities_except_self(2, 'minecraft:player'), { v.x = v.x + (t.player -> q.is_sheared); }); return v.x > 0.0;"
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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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:::
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::: code-group
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```json [BP/animation_controllers/pig_animation_controllers.json]
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{
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"format_version": "1.10.0",
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"animation_controllers": {
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"controller.animation.pig_find_player": {
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"initial_state": "default",
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"states": {
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"default": {
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"animations": ["find_player"],
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"transitions": [{
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"detected": "v.x > 0"
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}]
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},
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"detected": {
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"animations": ["find_player"],
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"transitions": [{
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"default": "v.x <= 0"
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}],
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"on_entry": ["/say oink oink"]
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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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:::
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::: code-group
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```json [BP/entities/my_entity.json#description]
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"animations": {
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"manage_find_player": "controller.animation.pig_find_player",
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"find_player": "animation.pig.find_player"
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},
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"scripts": {
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"animate": ["manage_find_player"]
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}
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```
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:::
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