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---
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front: https://mc.res.netease.com/pc/zt/20201109161633/mc-dev/assets/img/5_5.d0bc082b.jpg
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hard: 进阶
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time: 25分钟
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---
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# 简易教程②：制作一个加速作物生长的火把方块
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#### 作者：境界
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加速火把示例包下载：下载[示例包](https://g79.gdl.netease.com/guidedemo-case13.zip) 。
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#### 火把方块示意图：
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#### 增加火把方块行为包
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```
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{
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"format_version": "1.16.0",
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"minecraft:block": {
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"description": {
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"identifier": "design:custom_torch",
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"register_to_creative_menu": true
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},
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"components": {
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"minecraft:block_light_absorption": 0,
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"minecraft:block_light_emission": 1.0,
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"minecraft:destroy_time": 1.0,
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"netease:render_layer": {
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"value": "alpha"
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},
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"netease:aabb": {
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"collision": {
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"min": [0.4375, 0.0, 0.4375],
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"max": [0.5625, 0.6875, 0.5625]
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},
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"clip": {
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"min": [0.4375, 0.0, 0.4375],
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"max": [0.5625, 0.6875, 0.5625]
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}
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},
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"netease:solid": {
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"value": false
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},
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"netease:pathable": {
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"value": true
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},
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"netease:block_entity": {
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"tick": true,
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"movable": false
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}
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}
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}
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}
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```
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1）首先我们将方块的透光率设置为0，即将minecraft:block_light_absorption值写为0。这是由于火把方块用到自定义模型，游戏内的日夜光照会对模型进行阴影覆盖，我们希望方块受到阴影的程度的影响小一些，因此将值设置为0。开发者也可以根据自己的实际情况，在0~15间内进行微调，这是透光率组件允许接受的数值范围。
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2）接着使用minecraft:block_light_emission组件，将发光程度调成1.0，使火把会在游戏内产生发光效果。开发者也可以根据自己的实际情况，在0.0~1.0间内进行微调，这是发光组件允许接受的数值范围。
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2）接着用netease:render_layer将方块材质设置为透明材质，以允许方块模型使用带有透明图层的贴图。
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3）之后在netease:aabb里，将碰撞体积和射线检测贴准火把方块真实的样子。组件中，每1点对应blockbench建模空间中16格，也就是每0.0625的长度对应blockbench内的一格空间。
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4）接着将方块设置为非实心方块，这是由于我们希望避免玩家与苹果方块接触时，偶尔会因为碰撞盒重叠出现窒息扣血的情况。
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5）紧接着，我们使用一个方块自定义的小技巧，即不设置方块的掉落物。那么在游戏内，方块默认会掉落方块物品本身。
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6）最后，将方块设置为生物无视其继续循着自己的寻路路径走。
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#### 增加火把方块材质包
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1）使用MCSTUDIO导出火把方块工程文件，获得json模型文件
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2）将模型文件的贴图资源指向原版的火把贴图"torch_on"，将环境光遮罩关闭("use_ao": false)
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3）在材质包/blocks.json内配置火把方块的模型和破坏音效
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#### 脚本实现自定义方块
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```
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{
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"format_version": "1.16.0",
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"minecraft:block": {
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"description": {
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"identifier": "design:custom_torch",
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"register_to_creative_menu": true
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},
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"components": {
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"netease:block_entity": {
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"tick": true,
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"movable": false
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}
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}
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}
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}
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```
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在自定义方块内加入"netease:block_entity"组件，其中设置tick为真，movable为假。加速火把方块会在每一秒发送20次事件到脚本层，即 每一次事件间隔为1 / 20 = 0.05秒。
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在示例图中，我们通过监听ServerBlockEntityTickEvent来判断是否可以将小麦变成下一个生长程度，判定条件为小麦是否是成熟状态，注意本加速火把示例中，只对小麦种子加速有效果，其他种子无效果。
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```
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def torch_grow(self, event):
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x = event['posX'] # 获取坐标X
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y = event['posY'] # 获取坐标Y
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z = event['posZ'] # 获取坐标Z
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block_name = event['blockName']
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if block_name != 'design:custom_torch': # 是否为自定义加速方块
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return
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dim_id = event['dimension'] # 获取维度ID
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block_comp = serverApi.GetEngineCompFactory().CreateBlockInfo(serverApi.GetLevelId())
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block_state_comp = serverApi.GetEngineCompFactory().CreateBlockState(serverApi.GetLevelId())
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block_entity_comp = serverApi.GetEngineCompFactory().CreateBlockEntityData(serverApi.GetLevelId())
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block_entity_data = block_entity_comp.GetBlockEntityData(dim_id, (x, y, z)) # 获取方块数据
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tick = block_entity_data['tick'] # 获取方块刷新次数
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if not tick:
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tick = 0
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tick += 1 # 加速火把方块会在每一帧自增一次刷新次数
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block_entity_data['tick'] = tick
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if tick % 20 != 0: # 根据文档可知事件会在一秒刷新20次，当刷新次数与20求模为0时，即过了一秒钟
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return
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# 运用列表推导式，获得[(x - 1, y, z - 1), (x, y, z - 1), (x + 1, y, z - 1), (x + 1, y, z + 1), (x, y, z),
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# (x - 1, y, z + 1), (x, y, z + 1), (x - 1, y, z), (x + 1, y, z)]的坐标列表
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grow_poses = [(x + x_offset, y, z + z_offset) for x_offset in xrange(-1, 2) for z_offset in xrange(-1, 2)]
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grow_poses.remove((x, y, z)) # 由于坐标(x, y, z)是加速火把，所以移除这个坐标
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for grow_pos in grow_poses:
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block = block_comp.GetBlockNew(grow_pos, dim_id)
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if block and block['name'] == 'minecraft:wheat': # 如果是小麦
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block_state = block_state_comp.GetBlockStates(grow_pos, dim_id)
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if block_state['growth'] < 7: # 且小麦还未成熟，即成长值小于7
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block_state['growth'] += 1 # 增加一级成长值
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block_state_comp.SetBlockStates(grow_pos, block_state, dim_id)
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```
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#### 最终效果如下：
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