If you've been working on a design in Chief Architect and want to share it with others in an interactive 3D format, you can easily export your file for use in a 3D viewer. Here's how to do it:

1. In Chief Architect, open the project file that you want to export for the 3D viewer.

2. Once the file is open, go to the 'File' menu and select 'Export' and then '3D Viewer'.

3. A dialog box will appear allowing you to customize the export settings. You can choose the level of detail, the type of lighting, and other display options. Make your selections and click 'OK' to proceed.

4. Choose a location on your computer to save the exported file, and then click 'Save'.

5. Your project file will be exported in a format that is compatible with 3D viewers, allowing others to view and interact with your design in an immersive 3D environment.

By following these simple steps, you can easily share your Chief Architect designs with clients, colleagues, or anyone else who wants to experience your vision in 3D. Whether you're working on a residential interior, commercial development, or any other architectural project, exporting your Chief Architect file for 3D viewing is a great way to showcase your work and get valuable feedback. So don't hesitate to take advantage of this feature and bring your designs to life in a whole new way!