> For the complete documentation index, see [llms.txt](https://mindcodeinteractive.gitbook.io/easy-build-system/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mindcodeinteractive.gitbook.io/easy-build-system/reference/building-group.md).

# Building Group

Defines a group in the scene where [Building Parts](/easy-build-system/reference/building-part.md) are organized together by proximity.\
Updated automatically as [Building Parts](/easy-build-system/reference/building-part.md) are placed or destroyed in the scene.

***

### How Groups Work

Parts placed near each other are automatically grouped under a shared [Building Group](#how-groups-work).\
Groups represent structures like a house, a bridge, or a tower.\
They enable mesh batching for performance and allow collapse when a supporting part is removed.

Groups are created, merged, and split automatically by the Grouping System.\
The group's pivot is recentered to the geometric center of all its parts after each change.

A group can be marked as **Don't Destroy Group** to prevent it from being removed when empty. Dynamic groups (containing parts with Rigidbodies) update their bounds every frame.

***

### Scripting Examples

Get all registered groups:

```csharp
HashSet<BuildingGroup> groups = BuildingManager.Instance.GetRegisteredGroups;
```

Get a part's group:

```csharp
BuildingGroup group = myPart.AttachedGroup;
```

Get all parts in a group:

```csharp
List<BuildingPart> parts = group.GroupedParts;
```

Get the structure's bounding box:

```csharp
Bounds bounds = group.GroupBounds;
```

Batch and unbatch a group manually:

```csharp
group.BatchGroup();
group.UnbatchGroup();
```

Listen for group events:

```csharp
EventPublisher.Subscribe<BuildingGroupEvent.RegisteredEventArgs>(e =>
{
    Debug.Log("Group registered: " + e.Group.name);
});

EventPublisher.Subscribe<BuildingGroupEvent.UnregisteredEventArgs>(e =>
{
    Debug.Log("Group unregistered: " + e.Group.name);
});

EventPublisher.Subscribe<BuildingGroupEvent.UpdatedEventArgs>(e =>
{
    Debug.Log("Group updated, part: " + e.Part.Name);
});
```

***

### Debug Visualization

The [Building Group](#how-groups-work) draws a wireframe cube showing the group's bounding box around all its parts.

Open the **Debug Settings** section on the component to access debug options.\
Displays the component's unique ID, registration state, and grouped part count.

Use **Debug Draw Flags** to control where gizmos render: Scene View, Game View, or both.


---

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