If you're using Windows 10 and want to view and interact with 3D models and images, the 3D Viewer app is a great tool for you. Here's how to use it:

1. Open the 3D Viewer app: You can find the 3D Viewer app by searching for it in the Start menu or by opening it from the Windows Accessories folder in the Start menu.

2. Import a 3D model or image: Once the app is open, you can import a 3D model or image by clicking on the 'Open' button and selecting the file you want to view.

3. Interact with the 3D model or image: You can rotate, zoom, and pan the 3D model or image using your mouse or touch gestures. This allows you to view it from different angles and perspectives.

4. Adjust settings: The 3D Viewer app also provides options to adjust settings such as lighting, background color, and rendering quality to customize your viewing experience.

5. Use Mixed Reality Viewer: If you have a compatible Windows Mixed Reality headset, you can also view your 3D models and images in a mixed reality environment for an even more immersive experience.

6. Save and share: Once you're done viewing and interacting with the 3D model or image, you can save it or easily share it with others using the built-in sharing options.

Using the 3D Viewer app in Windows 10 is a great way to explore and interact with 3D content without needing any additional software or tools. Whether you're a designer, artist, or just someone interested in 3D models and images, give it a try and see what you can create and explore!