> For the complete documentation index, see [llms.txt](https://qwertystudio.gitbook.io/massive-village/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://qwertystudio.gitbook.io/massive-village/legacy/sockets-door-light-flattening-5.4-only.md).

# Sockets (door, light, flattening) (5.4 only)

### What are those sockets?

Sockets are an Unreal feature that allows you to add "sockets" with a name and a tag on a mesh. Those sockets can then be used by many features in your game (for example placing the muzzle flash on a gun).

Massive World uses them to know where to place many objects like doors, light, or even flattening the ground for bigger buildings.

Here is an example of how to place a door for the exterior (they are separate from the interior so you can have different models).

{% embed url="<https://drive.google.com/file/d/1NvIk4cO2vYYqR_YU2XyN-guFvuCDfKIZ/view?usp=drive_link>" fullWidth="true" %}

In this video I...

1. Go inside the building mesh
2. Add a socket (the name doesn't matter)
3. Add the tag DoorEx (it is important)
4. To help myself with the placement I add a door preview (optional)
5. In that case, it looks better if I rotate the door 180 degrees, but you also get the possibility to rotate the door in the Door Data Asset.
6. Finally, the sockets are automatically created when you add a village, but in this case, the village was already in the world, so I hit "Generate" to update the socket
7. And it's done, the door is added to every house using this mesh.

### Socket list

PCG will read the sockets of the tag and it is not case-sensitive and works only on the buildings. More will come with future updates and requests!

DoorEx: Determine where to place the doors for the exterior

DoorIn: Determine where to place the doors for the exterior

LightFloor: Collection of light to use for the floors

LightWall: Collection of light to use for the walls

LightRoof: Collection of light to use for the roofs

Flatten: Add a flattened area to shape the landscape. Useful for bigger buildings.

Note that the door for the exterior and interior use a separate list but you can use the same doors for both if you want. They are separate just to give you more control if needed.