How to walk over a surface in AR / VR world?

Development Platform & Builds XR Development
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Hello, I am new to the unreal engine but I do have some background in developing ArKit 3.0 app. My idea is to design a surface / Mesh which will open in a camera as an AR world and user can walk over the mesh / Surface in AR World and see the other static objects around them.

You can imagine in the following steps:

  1. Users open the app.

  2. Start the AR world to open up the camera.

  3. Users tap on the screen to load the mesh.

  4. Users see a door and as soon as they enter into it.

  5. They can walk over the surface and see all the objects (It should feel like that they are moving into the surface).

  6. They can come out from the door.

I followed some AR tutorials on Unreal and was able to place the shapes on a plane. I can’t figure out what to search for the above requirements. Any help would be appreciable.