Entities

Note

These docs will only take care about polymer-related part of creation of entities. You might want to see official Fabric Wiki for more in depth look into how to create entities. You can skip most client side specific things, as it won't take effect server side (for example rendering/models)

Creation of entities

Creation of entities is mostly the same as vanilla. You just need to implement PolymerEntity interface on your entity's class. It exposes few defaulted methods for manipulation of client side visuals.

You also need to register your entity type as virtual, by using PolymerEntityUtils.registerType(EntityType... types).

Changing client side entity.

To select visual entity type, you just need to override EntityType<?> getPolymerEntityType(PacketContext context)

This method can't return null or another EntityType that points to other virtual entity, as it won't work.

Example use:

Displaying entity as zombie

@Override
public EntityType<?> getPolymerEntityType(PacketContext context) {
    return EntityType.ZOMBIE;
}

Modifying held items

You most likely want to modify items held by entity, to indicate its type. To do it you need to override List<Pair<EquipmentSlot, ItemStack>> getPolymerVisibleEquipment(List<Pair<EquipmentSlot, ItemStack>> items, ServerPlayerEntities player).

Example use:

Displaying real items with helmet replacement.

@Override
public List<Pair<EquipmentSlot, ItemStack>> getPolymerVisibleEquipment(List<Pair<EquipmentSlot, ItemStack>> items, ServerPlayerEntities player) {
    var list = new ArrayList<Pair<EquipmentSlot, ItemStack>>(map.size());
    for (var entry : items) {
        if (entry.getKey() == EquipmentSlot.HEAD) {
            continue;
        } else {
            list.add(Pair.of(entry.getKey(), entry.getValue()));
        }
    }
    list.add(new Pair<>(EquipmentSlot.HEAD, new ItemStack(Items.WITHER_SKELETON_SKULL)));

    return list;
}

Modifying client-side data trackers

For more control over entity, you can modify DataTracker values send to client directly. To do it, you need to override void modifyRawTrackedData(List<DataTracker.SerializedEntry<?>> data, ServerPlayerEntity player, boolean initial) method. You should also be safe around it, as sending DataTracker.Entry's, that don't exist on client-side entity representation will cause issues and errors!

To get TrackedData, which is needed to create Entries, you can either use accessors, or manually construct the data.

Example use:

Adding villager data to change how villager looks

@Override
public void modifyRawTrackedData(List<DataTracker.SerializedEntry<?>> data, ServerPlayerEntity player, boolean initial) {
    data.add(DataTracker.SerializedEntry.of(VillagerEntityAccessor.getVillagerData(), new VillagerData(VillagerType.JUNGLE, VillagerProfession.FARMER, 3);));
}