How do you make the material inside the window visible from the outside?

Development Rendering
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1

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214893-roborecall-showwindows-b.jpg
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It’s the material used for “RoboRecall”.
Who knows how to make this?

Or, I want you to let me know the hint to make the material inside the window.

2

I am not sure if I understand your question right but to look inside the wall you just need a mask for the windows or an alpha channel

3

Personally, I never tried it, but you want to google for “cubemaps in ue4” or something. This answer might be the solution already. Would be great to hear if it worked.

4

Your answer was very helpful.
Thank you~^^