Transparent Cube For Character how to make a transparent cube so that my character walks inside a building or house and you can see the interior partially, where my character is walking ?

in the reference image i make a blender render with transparency


the house is complete no have cuts
the character is inside the house
the cube is transparent


NOTE:
Now ... I have a basic idea to start from, but I do not know if BGE accepts the same form that I use to render, since I use a Boolean Difference modifier, and I do not know completely if these modifiers can be applied to blender game engine

I have seen it in some YouTube videos but I do not know if it is in BGE, and I would like to know if I can do it, it would be great, in logic bricks please, preferably, I'm still a python brute, I have a hard time not thinking about c / c ++

reference Link reading
You can accomplish this effect using material nodes, a mesh, a spot lamp, and a camera.
Blend-File (made in UPBGE 0.2x)
https://blend-exchange.com/b/bOl2J557
Explanation
When the spot lamp's shadow, which is casted by the mesh, hits the surface of the building, the casted shadow will act as an alpha (transparency) mask for the building.
Screenshot (nodes setup)

Tutorial
https://youtu.be/4Seqm826oWk