A 3D food service designer who is also a Revit software user can offer the following services to clients in the food and hospitality industry:

1. Concept Development: Creating initial designs and concepts for food service establishments using Revit software to create 3D models and visualizations.
2. Interior Design: Designing the interior of restaurants, cafes, and other food service establishments using Revit software to create a detailed 3D model of the space.
3. Kitchen 
4. Layout and Equipment Selection: Using Revit software to design a kitchen layout that is efficient and functional, and selecting the best equipment for the kitchen based on the menu and kitchen layout.
5. Structural and MEP Engineering: Using Revit software for structural and MEP engineering, including HVAC, electrical, and plumbing design, to ensure that the food service establishment is safe, efficient, and up to code
6. Project Management: Managing the project from start to finish, ensuring that it stays on track, and communicating with the client throughout the process.
7. Construction Documents: Using Revit software to create detailed construction documents that are accurate and easily understood by contractors and builders
8. Virtual Reality and Augmented Reality: Using Revit software and other tools to create immersive experiences for customers, such as virtual tours of the establishment or interactive menu items.

Overall, a 3D food service designer who is also a Revit software user can provide a complete design and construction package for food service establishments, from initial concept development to construction documents and project management.