> 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-manager/building-grouping-system.md).

# Building Grouping System

Automatically groups placed [Building Parts](/easy-build-system/reference/building-part.md) by proximity into shared [Building Groups](/easy-build-system/reference/building-group.md).

***

### How Grouping Works

When a part is placed, the system finds nearby groups and ungrouped parts within a set distance.\
If a nearby group is found, the part is added to it.\
If only nearby ungrouped parts are found, a new group is created containing all of them.\
If nothing is nearby, a new group is created for the part alone.

After each change, the group's pivot is recentered to the geometric center of all its parts.\
When parts are destroyed, the system updates or removes groups as needed.\
Loaded parts are re-grouped automatically when save data is restored.

Configure on the [Building Manager](/easy-build-system/reference/building-manager.md) inspector under **Grouping Settings**.\
The Grouping System requires the **Enable Grouping** toggle to be active.

***

### Relationship with Batching

Grouping is a prerequisite for batching. The Batching System combines meshes within groups. Without grouping enabled, there's nothing to batch.\
Enable grouping first, then enable batching for the performance benefit.

***

### Scripting Examples

Force-group a set of parts:

```csharp
HashSet<BuildingPart> parts = new HashSet<BuildingPart> { partA, partB, partC };
BuildingManager.Instance.GroupingSystem.GroupNearbyParts(parts);
```


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