Nvidia built a Holodeck
https://blogs.nvidia.com/blog/2017/10/10/holodeck-design-lab-of-the-future/ 'Nvidia Holodeck' is a real product – and it's almost what you're expecting, though not intended strictly for Starship crew use: Oh and they've also built AI into it to.... "Holodeck is also AI-ready, meaning that you can train agents and deploy them in the virtual space to test your designs against anticipated real-world conditions, including virtual operators and incidental personnel and staff who might interact with any machinery or other objects being prototyped before they’re built." https://blogs.nvidia.com/blog/2017/10/10/holodeck-design-lab-of-the-future/ https://blogs.nvidia.com/blog/2017/05/10/holodeck/ https://www.nvidia.com/en-us/design-visualization/technologies/holodeck/