Do you want to compare different 3D models side by side in a 3D viewer? Here's how you can do it easily.

1. Open the 3D viewer software on your computer or mobile device.

2. Once the 3D viewer is open, look for the option to 'Add Model' or 'Open Model' in the menu. Click on this option to select the first 3D model you want to open.

3. After the first model is loaded, you can now look for the option to 'Add Another Model' or 'Open Another Model'. Click on this option to select the second 3D model you want to open.

4. The 3D viewer should now display both models side by side, allowing you to compare and analyze them simultaneously.

5. You can repeat the process to add more models to the 3D viewer for better comparison and analysis.

Opening multiple models in a 3D viewer can be helpful for architecture, product design, and engineering, as it allows you to compare different design iterations or variations. It can also be useful for 3D artists and game developers who want to view and analyze multiple 3D assets at the same time.

By following the simple steps above, you can easily open and view multiple 3D models in a 3D viewer for better comparison and analysis. Whether you're a professional designer, engineer, or hobbyist, this feature can enhance your workflow and make it easier to compare different 3D designs. Try it out and see how it can benefit your 3D design projects!