> ## Documentation Index
> Fetch the complete documentation index at: https://xrlive.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Register MPC for Reset

> Reset a Material Parameter Collection to its defaults when the visual closes

## Blueprint node

**Category:** `XRLIVE | ACTORS`

Registers a Material Parameter Collection (MPC) asset to have all its scalar and vector parameters reset to their default values when the visual closes.

| Pin   | Type                            | Description               |
| ----- | ------------------------------- | ------------------------- |
| `MPC` | `UMaterialParameterCollection*` | The MPC asset to register |

## Example

```
Event BeginPlay
    ↓
Register MPC for Reset
    MPC: MPC_VisualGlobals
```

Then later in your visual, change MPC values freely:

```
Set Scalar Parameter Value (MPC_VisualGlobals, "Intensity", 0.8)
Set Vector Parameter Value (MPC_VisualGlobals, "Color", ...)
```

When the visual closes, all parameters are automatically restored to the default values stored in the `MPC_VisualGlobals` asset.

## Notes

* Register the MPC once on `Event BeginPlay` — you only need to call this node once per MPC regardless of how many times you write to it.
* The defaults are read from the **MPC asset** itself (the values shown in the asset editor), not from when you registered it.
* If multiple visuals share the same MPC, always register it so each visual starts from a known state.