Map unit

Not to be confused with maps, stages or scenes.

Map units contain placement data for game maps (e.g. MainField/A-1). In other words, they are used to configure fixed object spawns on maps for actors such as scenery and enemies for example, in contrast to the AutoPlacement system, which dynamically spawns actors.

Types

Two types of map units exist: Static and Dynamic.

Static map units are loaded during stage generation (see GameScene for more details). Their name is suffixed with _Static. They can contain both map rails and map objects; furthermore objects can be linked to each other to implement custom game logic using the #Link system.

Dynamic map units are loaded and unloaded on-the-fly. Their name is suffixed with _Dynamic. The dynamic loading capability is only really put to good use for open-world type stages (e.g. MainField and AocField). In such map units, the link system cannot be used and only map objects can be specified.

Contents

LocationPosX

X coordinate of the center of the map unit.

LocationPosZ

Y coordinate of the center of the map unit.

LocationSize

Size of the map unit (side length of the square).

Objs

Array of object structures. Must be sorted by HashId because the placement subsystem performs binary searches on the object array in various cases.

Rails

Array of rail structures. Can only appear in group 0 maps (Static); this section is completely ignored for non-static map units.

Link system

In static map units only, map objects can be linked to other objects (up to 255 in a single generation group). These links allow implementing custom logic and callbacks. For example, DeadUp signals the destination object when the source object dies. This is used to implement enemy chests that only unlock after clearing an enemy camp.

LinkTags and other tag objects are lightweight actors that are used to link objects together.

Objects that are linked together, either directly or via indirect links, are put into the same generation group and loaded at the same time^[check]. If the placement system fails to load an actor, the entire generation group is discarded.

Definitions

Cs means Constraint.

ID	Name	Description	Official description
4	-AxisX	-	マイナスX軸シグナル
5	-AxisY	-	マイナスY軸シグナル
6	-AxisZ	-	マイナスZ軸シグナル
24	AreaCol	Area collision (link target is an Area object)	エリア(センサ)指定
1	AxisX	-	X軸シグナル
2	AxisY	-	Y軸シグナル
3	AxisZ	-	Z軸シグナル
37	BAndSCs	Ball & Socket constraint	ボール＆ソケットCS
38	BAndSLimitAngYCs	Y angular velocity limited Ball & Socket constraint	Y角速度制限付ボール＆ソケットCS
0	BasicSig	Basic signal	基本シグナル
9	BasicSigOnOnly	Basic signal [only emits ON signals]	オンのみ基本シグナル
14	ChangeAtnSig	Signal on Attention change (e.g. picking up a weapon)	アテンション変更時シグナル
39	CogWheelCs	Gear/cogwheel constraint	歯車CS
21	CopyWaitRevival	Activate links when the revival flag of the CopyWaitRevival target is set (e.g. can be used with LinkTagAnd to trigger basic signals when a chest is opened)	配置自動セーブ継承
15	Create	Create a map object. Target objects are not created unless this link is activated.	生成
11	DeadUp	Signal on death	死んだらオン
16	Delete	Delete a map object. Target objects are created and stay spawned until this link is activated. Note: the corresponding collision is disabled even for objects that have their collision data extracted to separate Static Compound files.	削除
29	DemoMember	-	デモ参加
32	FixedCs	-	固定CS
26	ForSale	Links a shop item to its seller (target is the seller NPC).	売り物
19	ForbidAttention	Prevent attention (i.e. interacting with an object, for example picking up a weapon)	アテンションタイプ変更
18	Freeze	Freeze the target object	凍結
7	GimmickSuccess	Success signal (used for minigames)	ネタ成功シグナル
33	HingeCs	Hinge constraint	ヒンジCS
12	LifeZero	Emit a LifeZero signal when the life of the source object is 0	ライフ0
34	LimitHingeCs	Limited hinge constraint	制限付ヒンジCS
27	ModelBind	-	モデルバインド
17	MtxCopyCreate	-	位置継承生成
22	OffWaitRevival	Reset the revival flag of the target object	配置自動セーブオフ
30	PhysSystemGroup	-	物理システムグループ
28	PlacementLOD	Replace the source object with the link target object at lower level of details	配置LOD
36	PulleyCs	-	滑車CS
40	RackAndPinionCs	Rack-and-pinion constraint	ラック＆ピニオンCS
23	Recreate	Recreates the target object	再生成
41	Reference	-	参照
10	Remains	Divine Beast signal	遺物シグナル
25	SensorBind	-	センサバインド
35	SliderCs	Slider constraint	スライダーCS
13	Stable	-	安定
31	StackLink	-	スタック
20	SyncLink	Put the destination object and any object that is linked to it into the same generation group	生成グループ
8	VelocityControl	Velocity control signal	速度制御シグナル

Link tags

Not to be confused with actor tags.

LinkTagAnd, LinkTagOr, LinkTagNAnd, LinkTagNOr, LinkTagXOr, LinkTagCount, LinkTagPulse, LinkTagNone are small objects that are used to implement a basic logic system in map units.

AND, OR, NAND, NOR, XOR LinkTags are logical operators. They can be used to conditionally set or clear GameData flags, or conditionally spawn objects, trigger other objects, etc. A basic signal is emitted when the LinkTag has been triggered by all of the source links (for LinkTagAnds) or by one of them (for LinkTagOrs), etc.

Count LinkTags are used to increment a GameData flag every time the link tag itself is signalled.

Pulse LinkTags continuously emit a basic signal with a configurable signal duration (PulseLength).

None LinkTags have no effect. They are only used to put different map unit objects into the same placement generation group.

Internally, they are all implemented by the same actor class (LinkTag) since they share most of their core functionality, with only small differences in effects. A single link tag can only handle 0x60 incoming links. Only incoming links with defType <= 0xe are processed; other links are ignored.

Parameters are documented in AIDef:Action/LinkTagBaseAction.

File formats

Map unit binary

In Breath of the Wild, map units are stored in a binary format and given the mubin (Map Unit Binary) file extension. All map object IDs are replaced with CRC32 hashes as a space optimisation. BYML is used as the serialisation format.

Map units can be found in the Map content directory, and use the following naming convention: Map/%s/%s/%s%s.mubin (map type, map name, map name, suffix).

Despite the file extension, Map/%s/Location.mubin and Map/%s/LazyTraverseList.mubin are not actually map units.

Source map unit

Source map units have muunt as their file extension and use strings for map object IDs such as F-5_challenge.muunt/obj760 instead of CRC32 hashes of the IDs in map unit binaries.