Program Adaptation Requirements

LarkVR3.2 currently supports applications developed with Unity3D, Unreal, Unigine based on SteamVR, as well as applications based on OpenXR.

There are four VR types available in the management backend:

- VR (SteamVR shared): commonly used for shared VR applications developed based on SteamVR, which can be used without logging in with a Steam account.

- VR (SteamVR exclusive): typically used for applications developed based on SteamVR that require logging in with a Steam account. Only one application can run on a machine, and logging in with a Steam account is required before use.**In version V3.3.3.0,this type is removed by default.If you need to enable it,please add the following configuration item in`larkxr-center/application.properties`**
    ```
    pxy.dispatch-policy.enable-exclude-mode=true
    ```

- VR (OpenXR): applications developed based on OpenXR.

## General Requirements:

1. Supported engines include: Unreal, Unity3D, DirectX9, DirectX10, DirectX11, DirectX12, OpenGL.

2. Resolution at application startup should be based on the desired actual usage resolution, starting in windowed maximized mode rather than fullscreen exclusive mode.

- Fullscreen exclusive mode will allow only one application to run on the server. When the application resolution differs from the server's resolution, the server's resolution will be changed.

- For Unity applications, **do not** select the option highlighted in red in the image below:

![](https://showdoc.pingxingyun.com/Public/Uploads/2022-07-11/62cbd2fd723cb.png)

3. Applications must be purely 3D and single-process, with the following considerations:

- Only support applications with a single-process window, such as those developed with Unreal or Unity3D.

- Windows pop-ups are not supported; pop-ups should use graphic rendering.

- For programs developed with QT and OpenGL, replace QT controls with OpenGL/Widget for rendering in the scene together; otherwise, QT controls will not be captured.

- Applications should not open external documents like Word, PDF, or Excel through APIs.

## Requirements for VR (SteamVR shared) and VR (Nvidia VR solution) Programs:

1. Applications developed with Unreal Engine:

- SteamVR must be installed on the development machine to avoid issues with controller buttons not functioning, as shown in the image below:

![](https://showdoc.pingxingyun.com/Public/Uploads/2022-08-22/6302e6a30d112.png)

- Ensure to check the option for VR startup; otherwise, it will not work.

![](https://showdoc.pingxingyun.com/Public/Uploads/2022-08-22/6302e702a685b.png)

## Requirements for VR (OpenXR) Programs:

- Inside the application, the OpenXR plugin must be selected, as shown in the image below:

![](https://showdoc.pingxingyun.com/Public/Uploads/2022-08-22/6302eb9e5da3e.png)