1.12.2的霰弹枪教程:Minecraft 1.12.2模组开发(二十三) 霰弹枪！

1.16.5版本的投掷物教程:Minecraft 1.16.5模组开发(三十二) 自定义投掷物品实体

本期我们来介绍一下1.18.1版本下的武器与投掷物的具体制作教程。

1.投掷物模型制作

1.18.1的投掷物的制作与1.16.5较为类似，需要制作投掷物的模型，渲染文件，制作与之对应的投掷物物品。

BlockBench下载地址
首先我们用blockbench制作投掷物的模型，然后导出为.json文件:

将导出的.json文件放入resources\assets\你的模组名称\models\item中:

将贴图放入textures/entity包中。

之后是Java包的工作(四个文件):

2.在Items包中新建一个我们的物品类ItemMoSpitter:

ItemMoSpitter.java

package com.joy187.re8joymod.items;

import com.joy187.re8joymod.Main;
import com.joy187.re8joymod.entity.EntityMoSpitter;

import net.minecraft.world.entity.LivingEntity;
import net.minecraft.world.item.ArrowItem;
import net.minecraft.world.item.Item;
import net.minecraft.world.item.ItemStack;
import net.minecraft.world.level.Level;

public class ItemMoSpitter extends Item{
    public ItemMoSpitter(Item.Properties name) {
        super(name);
    }

    public ItemMoSpitter() {
                            //放到哪个物品栏 每个槽最多放几个
        super(new Properties().tab(Main.TUTORIAL_TAB).stacksTo(64));
    }

    public EntityMoSpitter createArrow(Level level, ItemStack stack, LivingEntity entityIn) {
        //指明我们生成的投掷物实体
        EntityMoSpitter arrowentity = new EntityMoSpitter(level, entityIn);
        return arrowentity;
    }
    //如果有无限的附魔，就不消耗子弹
    public boolean isInfinite(ItemStack stack, ItemStack bow, net.minecraft.world.entity.player.Player player) {
        int enchant = net.minecraft.world.item.enchantment.EnchantmentHelper.getItemEnchantmentLevel(net.minecraft.world.item.enchantment.Enchantments.INFINITY_ARROWS, bow);
        return enchant <= 0 ? false : this.getClass() == ItemMoSpitter.class;
     }

}

在Init包的ItemInit类中添加我们的投掷物物品声明:

ItemInit.java

public class ItemInit {
    public static final DeferredRegister<Item> ITEMS = DeferredRegister.create(ForgeRegistries.ITEMS,
            Main.MOD_ID);

    //我们的投掷物品声明
    public static RegistryObject<Item> MOSPITTER = ITEMS.register("mospitter",()->
    {
        return new ItemMoSpitter();
    });

    private static <T extends Item> RegistryObject<T> register(final String name, final Supplier<T> item) {
        return ITEMS.register(name, item);
    }

}

3.在entity包中新建我们的投掷物实体类EntityMoSpitter

EntityMoSpitter.java

package com.joy187.re8joymod.entity;

import com.joy187.re8joymod.init.EntityInit;
import com.joy187.re8joymod.init.ItemInit;

import io.netty.buffer.Unpooled;
import net.minecraft.network.FriendlyByteBuf;
import net.minecraft.network.protocol.Packet;
import net.minecraft.network.syncher.EntityDataAccessor;
import net.minecraft.network.syncher.EntityDataSerializers;
import net.minecraft.network.syncher.SynchedEntityData;
import net.minecraft.world.damagesource.DamageSource;
import net.minecraft.world.effect.MobEffectInstance;
import net.minecraft.world.effect.MobEffects;
import net.minecraft.world.entity.Entity;
import net.minecraft.world.entity.EntityType;
import net.minecraft.world.entity.LivingEntity;
import net.minecraft.world.entity.animal.IronGolem;
import net.minecraft.world.entity.boss.enderdragon.EnderDragon;
import net.minecraft.world.entity.boss.wither.WitherBoss;
import net.minecraft.world.entity.monster.Ravager;
import net.minecraft.world.entity.projectile.AbstractArrow;
import net.minecraft.world.entity.projectile.Arrow;
import net.minecraft.world.entity.projectile.ThrowableItemProjectile;
import net.minecraft.world.item.Item;
import net.minecraft.world.item.ItemStack;
import net.minecraft.world.item.Items;
import net.minecraft.world.level.Level;
import net.minecraft.world.phys.EntityHitResult;
import net.minecraftforge.network.NetworkHooks;

public class EntityMoSpitter extends ThrowableItemProjectile {
    //投掷物伤害
    public double damage;
    private int ticksInGround;
    private static final EntityDataAccessor<Integer> ID_EFFECT_COLOR = SynchedEntityData.defineId(EntityMoSpitter.class, EntityDataSerializers.INT);

    public EntityMoSpitter(EntityType<?> entityIn, Level level) {
        super((EntityType<? extends EntityMoSpitter>) entityIn, level);
        //this.size(1.0F, 1.0F);
        this.damage = 6.0D;
        // TODO Auto-generated constructor stub
    }

    public EntityMoSpitter(Level world, LivingEntity entity) {
        super(EntityInit.MOSPITTER.get(), entity, world);
        //把伤害初始为6点
        this.damage= 6.0D;
    }

    //原理类似弓箭、雪球，我们对应第二步中的投掷物品
    @Override
    protected Item getDefaultItem() {
        return ItemInit.MOSPITTER.get();
    }
    //打到生物身上的效果
    protected void onHitEntity(EntityHitResult result) {
        super.onHitEntity(result);
        Entity entity = result.getEntity();


        int i = 6;
        if(entity instanceof IronGolem || entity instanceof Ravager){
            i = 10;
        }
        if(entity instanceof EnderDragon || entity instanceof WitherBoss){
            i= 11;
        }
//        if(entity instanceof EntityMoreau || entity instanceof EntityHeisen || entity instanceof EntityDimi2 || entity instanceof EntityMiranda2){
//            i= 4;
//        }
        entity.hurt(DamageSource.thrown(this, this.getOwner()), (float)(i+random.nextFloat()*0.5*this.damage));
        if(random.nextInt(3)==2)
        {
            //给生物一个中毒效果
            ((LivingEntity)entity).addEffect(new MobEffectInstance(MobEffects.POISON, 100,1,true,true));
        }
        else
        {
            ((LivingEntity)entity).addEffect(new MobEffectInstance(MobEffects.MOVEMENT_SLOWDOWN, 50,0,true,true));
            ((LivingEntity)entity).addEffect(new MobEffectInstance(MobEffects.BLINDNESS, 60,1,true,true));
        }
    }

    //撞到墙上就把这个子弹给从主世界移除
    protected void onHit(EntityHitResult p_70227_1_) {
        super.onHit(p_70227_1_);
        if (!this.level.isClientSide) {
            this.level.broadcastEntityEvent(this, (byte)3);
            this.remove(Entity.RemovalReason.KILLED);
        }
    }

    @Override
    public Packet<?> getAddEntityPacket() {
        FriendlyByteBuf pack = new FriendlyByteBuf(Unpooled.buffer());
        pack.writeDouble(getX());
        pack.writeDouble(getY());
        pack.writeDouble(getZ());
        pack.writeInt(getId());
        pack.writeUUID(getUUID());


        return NetworkHooks.getEntitySpawningPacket(this);

    }

}

4.为我们的投掷物进行渲染，render包中新建一个渲染类RenderMoSpitter

RenderMoSpitter.java

package com.joy187.re8joymod.entity.render;

import com.joy187.re8joymod.Main;
import com.joy187.re8joymod.entity.EntityMoSpitter;
import com.joy187.re8joymod.entity.model.ModelMoSpitter;
import com.joy187.re8joymod.entity.model.ModelRe8Dimi;
import com.mojang.blaze3d.vertex.PoseStack;
import com.mojang.blaze3d.vertex.VertexConsumer;
import com.mojang.math.Matrix3f;
import com.mojang.math.Matrix4f;
import com.mojang.math.Vector3f;

import net.minecraft.client.renderer.MultiBufferSource;
import net.minecraft.client.renderer.RenderType;
import net.minecraft.client.renderer.block.model.ItemTransforms;
import net.minecraft.client.renderer.entity.EntityRenderer;
import net.minecraft.client.renderer.entity.EntityRendererProvider;
import net.minecraft.client.renderer.entity.EntityRendererProvider.Context;
import net.minecraft.client.renderer.texture.OverlayTexture;
import net.minecraft.client.renderer.entity.ItemRenderer;
import net.minecraft.core.BlockPos;
import net.minecraft.resources.ResourceLocation;


public class RenderMoSpitter extends EntityRenderer<EntityMoSpitter> {
    //指定我们的投掷物的皮肤，一般是我们blockbench中的那张贴图(第一步中的贴图)
    public static final ResourceLocation TEXTURE = new ResourceLocation(Main.MOD_ID ,"textures/entity/moreau.png");
    private static final float MIN_CAMERA_DISTANCE_SQUARED = 12.25F;
    private final ItemRenderer itemRenderer;
    //投掷物大小
    private final float scale;
    //投掷物是不是发光
    private final boolean fullBright;

    public RenderMoSpitter(EntityRendererProvider.Context manager) {
        //this.itemRenderer = manager.getItemRenderer();
        super(manager);
        this.itemRenderer=manager.getItemRenderer();
        this.scale=0.25F;
        this.fullBright=false;

     }


    private static final RenderType field_229044_e_ = RenderType.entityCutoutNoCull(TEXTURE);


    protected int getSkyLightLevel(EntityMoSpitter p_239381_1_, BlockPos p_239381_2_) {
        return 1;
    }
    @Override
    public ResourceLocation getTextureLocation(EntityMoSpitter p_110775_1_) {
        return TEXTURE;
    }

    public void render(EntityMoSpitter entityIn, float entityYaw, float partialTicks, PoseStack poseStackIn, MultiBufferSource bufferIn, int packedLightIn) {
        if (entityIn.tickCount >= 2 || !(this.entityRenderDispatcher.camera.getEntity().distanceToSqr(entityIn) < 12.25D)) {
           poseStackIn.pushPose();
           poseStackIn.scale(this.scale, this.scale, this.scale);
           poseStackIn.mulPose(this.entityRenderDispatcher.cameraOrientation());
           poseStackIn.mulPose(Vector3f.YP.rotationDegrees(180.0F));
           this.itemRenderer.renderStatic(entityIn.getItem(), ItemTransforms.TransformType.GROUND, packedLightIn, OverlayTexture.NO_OVERLAY, poseStackIn, bufferIn, entityIn.getId());
           poseStackIn.popPose();
           super.render(entityIn, entityYaw, partialTicks, poseStackIn, bufferIn, packedLightIn);

        }
     }

    private static void vertexRender(VertexConsumer p_229045_0_, Matrix4f p_229045_1_, Matrix3f p_229045_2_, int p_229045_3_, float p_229045_4_, int p_229045_5_, int p_229045_6_, int p_229045_7_) {
        p_229045_0_.vertex(p_229045_1_, p_229045_4_ - 0.5F, (float)p_229045_5_ - 0.25F, 0.0F).color(255, 255, 255, 255).overlayCoords(OverlayTexture.NO_OVERLAY).normal(p_229045_2_, 0.0F, 1.0F, 0.0F).endVertex();
    }

}

在ClientModEventSubscriber.java中添加我们的投掷物的渲染事件注册:

ClientModEventSubscriber.java

package com.joy187.re8joymod;

import net.minecraftforge.fml.common.Mod;
import net.minecraftforge.fml.common.Mod.EventBusSubscriber;
import net.minecraftforge.fml.event.lifecycle.FMLClientSetupEvent;

import com.joy187.re8joymod.entity.EntityRe8Dimi;
import com.joy187.re8joymod.entity.model.ModelRe8Dimi;
import com.joy187.re8joymod.entity.render.RenderMoSpitter;
import com.joy187.re8joymod.entity.render.RenderRe8Dimi;
import com.joy187.re8joymod.init.EntityInit;

import net.minecraft.client.Minecraft;
import net.minecraft.client.renderer.entity.EntityRendererProvider;
import net.minecraft.client.renderer.entity.ThrownItemRenderer;
import net.minecraft.world.entity.Entity;
import net.minecraft.world.entity.EntityType;
import net.minecraftforge.api.distmarker.Dist;
import net.minecraftforge.client.event.EntityRenderersEvent;
import net.minecraftforge.event.entity.EntityAttributeCreationEvent;
import net.minecraftforge.eventbus.api.SubscribeEvent;

@Mod.EventBusSubscriber(modid = Main.MOD_ID, value = Dist.CLIENT, bus = Mod.EventBusSubscriber.Bus.MOD)
public class ClientModEventSubscriber
{

    @SubscribeEvent
    public static void onRegisterLayers(EntityRenderersEvent.RegisterLayerDefinitions event) {
        event.registerLayerDefinition(ModelRe8Dimi.LAYER_LOCATION, ModelRe8Dimi::createBodyLayer);
    }

    @SubscribeEvent
    public static void onRegisterRenderer(EntityRenderersEvent.RegisterRenderers event) {
        event.registerEntityRenderer(EntityInit.RE8DIMI.get(), RenderRe8Dimi::new);

        //添加我们的投掷物的渲染事件
        event.registerEntityRenderer(EntityInit.MOSPITTER.get(), RenderMoSpitter::new);

    }

    @SubscribeEvent
    public static void onAttributeCreate(EntityAttributeCreationEvent event) {
        event.put(EntityInit.RE8DIMI.get(), EntityRe8Dimi.prepareAttributes().build());
    }
} // end class

5.发射器和投掷物的制作过程类似，用blockbench建模，导出其.json文件，放入resources\assets\你的模组名称\models\item中。皮肤放入textures/item包中。

6.在Item中新建我们发射器类ItemMoreauHead

ItemMoreauHead.java

package com.joy187.re8joymod.items;

import java.util.function.Predicate;

import com.joy187.re8joymod.Main;
import com.joy187.re8joymod.entity.EntityMoSpitter;
import com.joy187.re8joymod.init.ItemInit;

import net.minecraft.client.renderer.EffectInstance;
import net.minecraft.core.particles.ParticleTypes;
import net.minecraft.sounds.SoundEvents;
import net.minecraft.sounds.SoundSource;
import net.minecraft.stats.Stats;
import net.minecraft.world.InteractionHand;
import net.minecraft.world.InteractionResultHolder;
import net.minecraft.world.effect.MobEffectInstance;
import net.minecraft.world.effect.MobEffects;
import net.minecraft.world.entity.LivingEntity;
import net.minecraft.world.entity.player.Player;
import net.minecraft.world.entity.projectile.AbstractArrow;
import net.minecraft.world.item.BowItem;
import net.minecraft.world.item.Item;
import net.minecraft.world.item.ItemStack;
import net.minecraft.world.item.ProjectileWeaponItem;
import net.minecraft.world.item.Vanishable;
import net.minecraft.world.item.enchantment.EnchantmentHelper;
import net.minecraft.world.item.enchantment.Enchantments;
import net.minecraft.world.level.Level;

public class ItemMoreauHead extends ProjectileWeaponItem implements Vanishable {

    public ItemMoreauHead() {
        super(new ItemMoreauHead.Properties().tab(Main.TUTORIAL_TAB).stacksTo(1));
    }

    public ItemMoreauHead(Item.Properties name) {
          super(name);
    }


    public void releaseUsing(ItemStack p_77615_1_, Level level, LivingEntity p_77615_3_, int p_77615_4_) {
        if (p_77615_3_ instanceof Player) {
            Player Player = (Player)p_77615_3_;
            boolean flag = Player.getAbilities().instabuild || EnchantmentHelper.getItemEnchantmentLevel(Enchantments.INFINITY_ARROWS, p_77615_1_) > 0;
//            ItemStack itemstack = Player.getProjectile(p_77615_1_);
            Player.addEffect(new MobEffectInstance(MobEffects.WATER_BREATHING, 200,1,true,true));

            ItemStack itemstack = this.findAmmo(Player);

            int i = this.getUseDuration(p_77615_1_) - p_77615_4_;
            i = net.minecraftforge.event.ForgeEventFactory.onArrowLoose(p_77615_1_, level, Player, i, !itemstack.isEmpty() || flag);
            if (i < 0) return;

            if (!itemstack.isEmpty() || flag) {
                if (itemstack.isEmpty()) {
                    itemstack = new ItemStack(ItemInit.MOSPITTER.get().asItem());
                }

                float f = getPowerForTime(i);
                if (!((double)f < 0.1D)) {
                    boolean flag1 = Player.getAbilities().instabuild || (itemstack.getItem() instanceof ItemMoSpitter && ((ItemMoSpitter)itemstack.getItem()).isInfinite(itemstack, p_77615_1_, Player));
                    if (!level.isClientSide) {
                        ItemMoSpitter arrowitem = (ItemMoSpitter)(itemstack.getItem() instanceof ItemMoSpitter ? itemstack.getItem() : ItemInit.MOSPITTER.get().asItem());
                        //这里指明我们之前的投掷物实体
                        EntityMoSpitter abstractarrowentity = arrowitem.createArrow(level, itemstack, Player);

                        abstractarrowentity = customArrow(abstractarrowentity);
                        //abstractarrowentity.setItem(itemstack);
                        abstractarrowentity.shootFromRotation(Player, Player.getXRot(), Player.getYRot(), 0.2F, f * 30.0F, 0.75F);

                        abstractarrowentity.level.addParticle(ParticleTypes.BUBBLE, abstractarrowentity.getX(), abstractarrowentity.getY(), abstractarrowentity.getZ(), abstractarrowentity.position().x , abstractarrowentity.position().y, abstractarrowentity.position().z);
                        abstractarrowentity.playSound( SoundEvents.ARROW_SHOOT, 2.5F,2.5F);


                        if (EnchantmentHelper.getItemEnchantmentLevel(Enchantments.FLAMING_ARROWS, p_77615_1_) > 0) {
                            abstractarrowentity.setSecondsOnFire(100);
                        }

                        p_77615_1_.hurtAndBreak(1, Player, (p_220009_1_) -> {
                            p_220009_1_.broadcastBreakEvent(Player.getUsedItemHand());
                        });


                        abstractarrowentity.level.addParticle(ParticleTypes.BUBBLE_POP, abstractarrowentity.getX(), abstractarrowentity.getY(), abstractarrowentity.getZ(), abstractarrowentity.position().x * -0.2D, 0.08D, abstractarrowentity.position().z * -0.2D);

                        level.addFreshEntity(abstractarrowentity);
                        Player.addEffect(new MobEffectInstance(MobEffects.CONDUIT_POWER, 60,1,true,true));

                    }
                    //发射的声音
                    level.playSound((Player)null, Player.getX(), Player.getY(), Player.getZ(), SoundEvents.ARROW_SHOOT, SoundSource.PLAYERS, 1.4F, 1.4F / (Player.getRandom().nextFloat() * 0.4F + 1.2F) + f * 0.5F);
                    if (!flag1 && !Player.getAbilities().instabuild) {
                        itemstack.shrink(1);
                        if (itemstack.isEmpty()) {
                            Player.getInventory().removeItem(itemstack);
                        }
                    }

                    Player.awardStat(Stats.ITEM_USED.get(this));
                }
            }
        }
    }

    public InteractionResultHolder<ItemStack> use(Level level, Player palyerIn, InteractionHand handIn) {
        ItemStack itemstack = palyerIn.getItemInHand(handIn);
        boolean flag = !this.findAmmo(palyerIn).isEmpty();
//        boolean flag;
//        if (!(itemstack.getItem() instanceof ShootableItem)) {
//            flag=false;
//        }


        InteractionResultHolder<ItemStack> ret = net.minecraftforge.event.ForgeEventFactory.onArrowNock(itemstack, level, palyerIn, handIn, flag);
        if (ret != null) return ret;

        if (!palyerIn.getAbilities().instabuild && !flag) {
            return InteractionResultHolder.fail(itemstack);
        } else {
            palyerIn.startUsingItem(handIn);
            return InteractionResultHolder.consume(itemstack);
        }
    }

    public static float getPowerForTime(int p_185059_0_) {
        float f = (float)p_185059_0_ / 20.0F;
        f = (f * f + f * 2.0F) / 3.0F;
        if (f > 1.0F) {
            f = 1.0F;
        }

        return f;
    }


    //发射间隔
    public int getUseDuration(ItemStack p_77626_1_) {
        return 600;
    }


    public Predicate<ItemStack> getAllSupportedProjectiles() {
        return ARROW_OR_FIREWORK;
    }

    public  EntityMoSpitter customArrow(EntityMoSpitter arrow) {
        return arrow;
    }
    public int getDefaultProjectileRange() {
        return 11;
    }

    //判断我们是否有子弹
    protected ItemStack findAmmo(Player player)
    {
        if (this.isMoSpitter(player.getItemInHand(InteractionHand.OFF_HAND)))
        {
            return player.getItemInHand(InteractionHand.OFF_HAND);
        }
        else if (this.isMoSpitter(player.getItemInHand(InteractionHand.MAIN_HAND)))
        {
            return player.getItemInHand(InteractionHand.MAIN_HAND);
        }
        else
        {
            for (int i = 0; i < player.getInventory().getContainerSize(); ++i)
            {
                ItemStack itemstack = player.getInventory().getItem(i);

                if (this.isMoSpitter(itemstack))
                {
                    return itemstack;
                }
            }

            return ItemStack.EMPTY;
        }
    }
    //判断是不是这把枪的子弹
    protected boolean isMoSpitter(ItemStack stack)
    {
        return stack.getItem() instanceof ItemMoSpitter;
    }
}

在ItemInit类中添加我们发射器的声明:

ItemInit.java

    //枪物品的注册
    public static RegistryObject<Item> MOREAUHEAD = ITEMS.register("moreauhead",()->
    {
        return new ItemMoreauHead();
    });

7.在resources包中的lang包中的en_us.json添加我们的投掷物和发射器的英文名称:

{

    "item.re8joymod.moreauhead":"Moreau Head",
    "item.re8joymod.mospitter":"Moreau Secretion",


    "itemGroup.re8joymod": "RE8 Item"
}

也可以在zh_cn.json中添加中文名称:

{

    "item.re8joymod.moreauhead":"发射器",
    "item.re8joymod.mospitter":"投掷物",


    "itemGroup.re8joymod": "模组物品栏"
}

8.保存项目，运行游戏测试:

我们拿出自己的发射器，然后右键，发现自定义的投掷物成功投出！