HUD extensions can be rendered in Unity. When a HUD extension is loaded, a HUD prefab is loaded from an asset bundle file located in the same directory as the Vortex file that contains the HUD extension.

Manually creating prefabs and Asset Bundles

To manually create assets for the HUD Extensions, a Unity project with the Vortex Integration Package is needed (such as VortexUnityTools or your own project), some spline prefabs must be added and the assets must be packaged in an asset bundle.

For an overview of the assets workflow, refer to Workflow for Preparing and Using Assets for a Vortex Simulation with Unity Graphics.

HUD Extensions Prefabs

When a HUD extension is loaded, the Vortex Integration will look for a HUD prefab with a specific name. The prefab name must be the same as the HUD extension name.
For example, if we open the Excavator HUD mechanism, from the Excavator equipment in the demo scenes, with the Vortex Studio Editor, we can see a couple of HUD text and HUD Image.
If we take the HUD Text Time, the prefab you create in the Unity Editor must have the same name: Time

Creating a HUD Prefab

The root GameObject of the HUD prefab must be a Canvas and it must have a Vortex HUD component:

1. Create a Canvas GameObject.
   
   
   
2. Rename the Canvas GameObject to the HUD extension name and add a Vortex HUD component.
   
   
   
3. Set the HUD Type (to Text for this case) and set the Overlay Canvas.
   The Render Mode of the Overlay Canvas must be set to Screen Space - Overlay
   and the Overlay Canvas will be used to set the Target Display according to the HUD extension Viewport Name.
   
   
   
4. Add a Text GameObject and set it as the Main Text.
   
5. Create a folder, into the Assets folder, with the same name as the Vortex document containing the HUD extension.
   Drag and drop the GameObject in the folder to create the prefab.
   
   
   
6. You can adjust the prefab Text GameObject from the prefab editor.
   

HUD Image prefab creation is the same thing except it doesn't need the Text component and the HUD Type must be Image.

Creating an Asset Bundle

Once the HUD prefabs are created, they can be packaged in an asset bundle so that they can be loaded by VortexUnityApp, or your own similar Unity application with Vortex Integration.

The process for generating an asset bundle is described in this section. 

In order to get VortexUnityApp to load the asset bundle properly, the asset bundle file should be placed in the same folder where is stored the Vortex file that contains the HUD extensions.
For example, for the Excavator HUD, we would have:

Vortex Image Looper

Vortex Image Looper component:

The Image Looper loops through a list of images and displays them on the Image component of the same GameObject. On activation, the first image is shown.

When adding an Image Looper to a GameObject, an Image component is added if it is not already present.

Nothing have to be set on the Image component, the Vortex Image Looper will take care of it.

Here is a Vortex Image Looper in action: