Scene wallpapers support two different modes, 2D and 3D. The 2D variant allows you to create animated wallpapers from images while the 3D one is meant to be used to import 3D models. The supported objects you can put in a scene wallpaper are called renderables.
2D Scene Wallpaper
Create a new 2D scene wallpaper by entering a project name and specifying the reference resolution. You can also choose a template to easily create preset wallpapers like flags. If you plan to import an image, you can also let it read the resolution automatically from the image later. 2D wallpapers are flat and use a 2D Coordinate System.
Make sure to check out the Tutorials for scenes.
3D Scene Wallpaper
Create a new 3D scene wallpaper by entering a project name and choosing an optional template. 3D scenes are typically used to display 3D models. 3D wallpapers have perspective and use a 3D Coordinate System.
- Layers Lists all renderables in your wallpaper. Click on the red X to remove an object. They are rendered from top to bottom, click and drag them to change their order. Select an object to edit its properties (3.) or move it around the scene (5.).
- Preview Shows you a preview of your wallpaper. Click and move the mouse or press WASD to move the camera. 2D scenes allow you to zoom with the mouse wheel. Keep in mind this preview does not necessarily show how the wallpaper looks like in case you added custom camera paths. Use the options in the View menu to see how the wallpaper will looks like on different monitors.
- Properties Allows you to change different aspects of the renderable you have selected.
- Assets All assets available in your wallpaper. When you import new images or models, create new particles or add other resources, they will show up here. Drag them into the scene graph (1.) to add a new instance of them to your wallpaper.
- Gizmos Use the three gizmos here to move, scale or rotate your selected renderable.
After you are done setting up your scene wallpaper you can publish it to Steam.