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手册:实例/附加包/方块/农作物
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引言[编辑]
我们可以通过方块置换来实现类似于原版农作物的方块，本实例将帮助你制作一个属于自己的自定义农作物。 由于原版农作物的工作机制较为复杂，本实例只提供一个由纯数据驱动内容实现的，仅受游戏随机刻影响的，最基本的自定义农作物。
前置知识[编辑]
你在阅读本实例前应该掌握如下知识：
- 附加包的构建
- 自定义物品
- 自定义方块
- 对方块置换的基本知识
教程[编辑]
添加种子[编辑]
首先在行为包的items文件夹下新建一个JSON文件，命名为custom_seed.json
{
"format_version":"1.20.50",
"minecraft:item":{
"description":{
"identifier":"wiki:custom_seed",
// 物品分组，这里将其归类至“种子”分组
"menu_category":{
"category": "nature",
"group":"itemGroup.name.seed"
},
},
"components":{
// 该物品显示名称，填本地化字符串
"minecraft:display_name":{
"value":"item.wiki:custom_seed.name"
},
// 该物品纹理，填物品短名称
"minecraft:icon":{
"texture":"wiki.custom_seed"
},
// 重中之重，添加这个组件可以使物品像原版的种子一样播种作物
"minecraft:block_placer":{
// 播种方块的ID
"block": "wiki:custom_crop",
// 可以在何种方块上播种，这里填farmland（耕地）
"use_on": ["farmland"]
}
}
}
}
然后为这个物品添加纹理与名称，由于篇幅原因，这里不再赘述。
添加作物方块[编辑]
行为包部分[编辑]
在行为包的blocks文件夹下新建一个JSON文件，命名为custom_crop.json
{
"format_version": "1.20.50",
"minecraft:block": {
"description": {
//方块ID需与种子物品的"block_placer"组件中填写的ID保持一致
"identifier": "wiki:custom_crop",
"states": {
//定义农作物的总生长阶段数
"custom_crop:growth": [0,1,2,3,4,5,6,7]
}
},
//设置每个生长阶段对应的方块置换，主要为纹理与选择箱的修改
"permutations": [
{
//"query.block_state(<block_state_name>)"是用于查询方块状态的molang，此处用于查询自定义农作物的当前生长阶段
"condition": "query.block_state('custom_crop:growth') == 0",
"components": {
//将方块纹理调为当前阶段对应的纹理
"minecraft:material_instances": {
"*": {
//在terrain_texture.json中定义的方块纹理字段
"texture": "custom_crop_stage0",
//取消环境光
"ambient_occlusion": false,
"face_dimming": false,
"render_method": "alpha_test"
}
},
//调整方块选择箱，该实例对应原版小麦
"minecraft:selection_box": {
"origin": [-8,0,-8],
"size": [16,3,16]
}
}
},
{
"condition": "query.block_state('custom_crop:growth') == 1",
"components": {
"minecraft:material_instances": {
"*": {
"texture": "custom_crop_stage1",
"ambient_occlusion": false,
"face_dimming": false,
"render_method": "alpha_test"
}
},
"minecraft:selection_box": {
"origin": [-8,0,-8],
"size": [16,4,16]
}
}
},
{
"condition": "query.block_state('custom_crop:growth') == 2",
"components": {
"minecraft:material_instances": {
"*": {
"texture": "custom_crop_stage2",
"ambient_occlusion": false,
"face_dimming": false,
"render_method": "alpha_test"
}
},
"minecraft:selection_box": {
"origin": [-8,0,-8],
"size": [16,7,16]
}
}
},
{
"condition": "query.block_state('custom_crop:growth') == 3",
"components": {
"minecraft:material_instances": {
"*": {
"texture": "custom_crop_stage3",
"ambient_occlusion": false,
"face_dimming": false,
"render_method": "alpha_test"
}
},
"minecraft:selection_box": {
"origin": [-8,0,-8],
"size": [16,9,16]
}
}
},
{
"condition": "query.block_state('custom_crop:growth') == 4",
"components": {
"minecraft:material_instances": {
"*": {
"texture": "custom_crop_stage4",
"ambient_occlusion": false,
"face_dimming": false,
"render_method": "alpha_test"
}
},
"minecraft:selection_box": {
"origin": [-8,0,-8],
"size": [16,12,16]
}
}
},
{
"condition": "query.block_state('custom_crop:growth') == 5",
"components": {
"minecraft:material_instances": {
"*": {
"texture": "custom_crop_stage5",
"ambient_occlusion": false,
"face_dimming": false,
"render_method": "alpha_test"
}
},
"minecraft:selection_box": {
"origin": [-8,0,-8],
"size": [16,14,16]
}
}
},
{
"condition": "query.block_state('custom_crop:growth') == 6",
"components": {
"minecraft:material_instances": {
"*": {
"texture": "custom_crop_stage6",
"ambient_occlusion": false,
"face_dimming": false,
"render_method": "alpha_test"
}
},
"minecraft:selection_box": {
"origin": [-8,0,-8],
"size": [16,15,16]
}
}
},
{
"condition": "query.block_state('custom_crop:growth') == 7",
"components": {
//设置成熟之后农作物的战利品表
"minecraft:loot": "loot_tables/blocks/custom_crop_riped.json",
"minecraft:material_instances": {
"*": {
"texture": "custom_crop_stage7",
"ambient_occlusion": false,
"face_dimming": false,
"render_method": "alpha_test"
}
},
"minecraft:selection_box": {
"origin": [-8,0,-8],
"size": [16,16,16]
}
}
}
],
"components": {
//设置未成熟时农作物的战利品表
"minecraft:loot": "loot_tables/blocks/custom_crop.json",
//使该方块可被瞬间破坏
"minecraft:destructible_by_mining": {
"seconds_to_destroy": 0.0
},
//使该方块不阻挡光线
"minecraft:light_dampening": 0,
//设置农作物模型，此处模型需手动装载，详情见下文
"minecraft:geometry": "geometry.bush_crop",
"minecraft:destructible_by_explosion": {
"explosion_resistance": 0.0
},
//取消该方块的碰撞箱
"minecraft:collision_box": false,
//设置该方块的骨粉催熟事件触发器
"minecraft:on_interact": {
"event": "wiki:on_interact",
//条件限制，若手持物品非骨粉或状态等于7则不触发事件
"condition": "query.is_item_name_any('slot.weapon.mainhand','minecraft:bone_meal' && query.block_state('custom_crop:growth')<7)"
},
//设置该方块只能放置在耕地上方
"minecraft:placement_filter": {
"conditions": [
{
"block_filter": ["farmland"],
"allowed_faces": ["up"]
}
]
},
//设置该方块的随机刻生长事件触发器
"minecraft:random_ticking": {
"on_tick": {
"event": "grow_stage",
"target": "self"
}
},
"tag:crop": {}
},
"events": {
//设置该方块的随机刻生长事件响应
"grow_stage": {
//若未成熟，则使生长阶段+1
"condition": "query.block_state('custom_crop:growth')<7",
"set_block_state": {
"custom_crop:growth": "(query.block_state('custom_crop:growth')<7) ? query.block_state('custom_crop:growth') + 1 : 7"
}
},
//设置该方块的骨粉催熟事件响应
"wiki:on_interact": {
"condition": "query.block_state('custom_crop:growth')<7"
"sequence": [
{
//有12/17的概率使生长阶段+3，若超过最大阶段则设为最大阶段
"randomize": [
{
"weight": 5
},
{
"weight": 12,
"sequence": [
{
"set_block_state": {
"custom_crop:growth": "(query.block_state('custom_crop:growth')<4) ? query.block_state('custom_crop:growth') + 3 : 7"
}
}
]
}
]
},
{
//消耗一个骨粉物品
"decrement_stack": {}
},
{
//在方块上播放催熟粒子
"run_command": {
"command": [
"particle minecraft:crop_growth_emitter ~~~"
]
}
}
]
}
}
}
}
至此，该作物方块的行为部分就写好了。
资源包部分[编辑]
虽然方块纹理已经在行为包部分进行了配置，但是其声音仍需在blocks.json中单独设置，其中农作物对应的字段是"grass"。
上文中的农作物模型游戏并未内置，所以我们需要在models/blocks文件夹下新建一个bush_crop.geo.json，具体内容如下：
{
//该文件对应原版小麦模型
"format_version": "1.12.0",
"minecraft:geometry": [
{
"description": {
"identifier": "geometry.bush_crop",
"texture_width": 16,
"texture_height": 16,
"visible_bounds_width": 2,
"visible_bounds_height": 2.5,
"visible_bounds_offset": [0, 0.75, 0]
},
"bones": [
{
"name": "bone",
"pivot": [8, -1, -8],
"cubes": [
{
"origin": [4, -1, -8],
"size": [0, 15, 16],
"uv": {
"west": {"uv": [16, 0], "uv_size": [-16, 16]}
}
},
{
"origin": [-4, -1, -8],
"size": [0, 15, 16],
"uv": {
"east": {"uv": [16, 0], "uv_size": [-16, 16]}
}
},
{
"origin": [-8, -1, -4],
"size": [16, 15, 0],
"uv": {
"north": {"uv": [16, 0], "uv_size": [-16, 16]}
}
},
{
"origin": [-8, -1, 4],
"size": [16, 15, 0],
"uv": {
"south": {"uv": [16, 0], "uv_size": [-16, 16]}
}
}
]
}
]
}
]
}
至此，该方块的模型和声音也配置完毕了，只需要再配置名称即可。
结语[编辑]
如果你看到了这里，那么恭喜你，你已经学会了如何自定义一个基础的农作物了！然而，农作物的实现方式远远不止这一种，你可以对其中的任意一个环节进行修改，来做出更酷的效果或者更复杂的生长机制，甚至可以配合脚本API编写更深刻的逻辑。
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