i am doing a graduation project at university, our project is an indoor navigation application. with the initial idea of ​​making everything as minimalist as possible, i am doing it by creating a map based on coordinates and using QR codes to determine the user's location. currently i am marking important corners to initialize the space that the user can move and the coordinates of the doors of the rooms the user can go to. QR codes will be pasted in each room so that the application can determine the user's current location. after the user scans the QR and selects the destination, the application will draw directions on the camera in real time. currently i am using simd_float3 to store the coordinates for the rooms, the current problem is that i don't know how to convert from simd_float3 to the appropriate coordinate system to be able to draw directions on the camera. i tried to search many resources about this and found that unity is a reasonable choice but i am trying to write an application using only swift. I really appreciate everyone's comments. Have a nice day!

Edit: Thank for you guys reply

the application's main function is to give guidance for navigating from room to room. it don't have to show or draw any map to display to user. All I have to do is to make sure that the camera should show the correct guidance to user to moving from room to room. My base idea is get the coordinates of space's corner which is available path that user can walk in it then mark a coordinate for each door room as a start/end point. when user provides start/end point, I will calculate and find path by A* algorithm or provide a fixed path to it and display it on the camera by line in real time. for now, I'm getting the coordinates by pick it from the image of the building's blueprint by gimp to get x and y value and calculating the ratio between the drawing and the actual size to get correct distance between two points. I have tried to redraw it and it completely fit with the image. I'm using ARKit and SceneKit to draw lines between points for navigation but now I have no idea to make the coordinates that I have fit with the real world. Here is the struct I use to save data

struct AvailablePath {
    let corner: [CGPoint]
}

struct RoomCoordinate {
    let roomName: String
    let coordinate: CGPoint
}

struct MapData {
    let availablePath: AvailablePath
    let coordinates: [RoomCoordinate]
}

I'm completely lost in how to using these in ARKit and SceneKit and have no idea how to do despite finding solutions hopelessly. This morning when I woke up, this idea came into my mind and I hope that you guys can give me some opinion. I need to provide more specific data to above structs so when the application read the data, it would know more information like the direction, distance... I also think that I need pictures of surrounding point so when user open the camera, the application could detect the environment and get correct directions.

Thank you so much and have a nice day, cheer