> ## Documentation Index
> Fetch the complete documentation index at: https://docs-unity.molca.id/llms.txt
> Use this file to discover all available pages before exploring further.

# DT startup flow

> Scene startup manager sequence for _MolcaDT and practical wiring checks.

**Source root:** `Assets/_MolcaDT/Code/Scripts/Managers/`

## When to use

Use this page when bootstrapping a DT scene/template and deciding manager initialization order (preload, auth, hierarchy, menu/panel flow).

## Typical manager chain

`_MolcaDT` does not use VR `ScenarioManager`; startup is manager-driven:

```mermaid theme={null}
flowchart TD
  preload[PreloadManager] --> login[LoginManager]
  login --> loading[LoadingManager]
  loading --> hierarchy[MachineHierarchyManager]
  hierarchy --> root[RootManager]
  root --> interface[InterfaceManager]
  interface --> mainmenu[MainMenuManager]
```

Exact scene wiring varies by project, but this reflects the common `_MolcaDT/Managers` responsibilities.

## Inspector setup checklist

* Add one active instance per manager type (`RootManager`, `MachineHierarchyManager`, `InterfaceManager`, etc.).
* Verify singleton/static access patterns in scripts that expose `instance` (many managers are singleton-like).
* Confirm required object references (panel roots, prefabs, TMP labels, button hooks).
* Validate preload/login transitions before opening machine-level panels.

## Code reference

`RootManager` is one concrete anchor for scene-driven setup:

```csharp theme={null}
// Assets/_MolcaDT/Code/Scripts/Managers/RootManager.cs
void Awake()
{
    instance = this;
}

public void SetupRootMachinePanel()
{
    if (rootMachinePanel == null || !usingRootMachinePanel) return;
    // Build root machine buttons and click handlers
}
```

## Troubleshooting

* **Panel opens with empty root machine list:** verify hierarchy data has loaded before `SetupRootMachinePanel`.
* **Duplicate manager behavior:** check for multiple manager instances in loaded additive scenes.
* **Buttons do nothing:** recheck prefab/button references and listener setup in manager scripts.

## Related

* [DT project layout](/dt/project-layout)
* [DT network and mapping](/dt/network-and-mapping)
* [DT POI and panels](/dt/poi-and-panels)