Simple Xenko Game and its .NET Core server that process remotely physics raycasts.
Press space or right click to "fire" and server will check if the sphere is hit.
Make sure to run the server first then the game.
Setting both projects as startup projects works fine too (right click on solution -> Set Startup Projects).
Right now the server uses Xenko API manually to load a scene, as a quick proof of concept.
Later it might be easier to have a HeadlessGame type to automatize loading of scene without graphics API and still be able to process specific C# scripts.