Hi Mikhail!
Thank you for the quick and detailed response!
You can create one material and replace textures in it using Replace Texture puzzles, no coding needed.
Could you point me to some detailed tutorials? I am studying arts and only know very little coding. I found this video of Yuri explaining how to switch textures https://www.youtube.com/watch?v=yYOyUwRveAU, but I do not understand how I do this at the beginning of the presentation with all the pictures.
Ten better to bake it, point lights with shadows extremely reduce performance of the application.
How do I bake them? I guess I have to create a texture for the floor and the wall. Do I still have the spotlights on the floor then?
Thanks for all your help!