Awesome! I had been working on a similar project couldn't figure out the snow on the trees for the life of me! It's great to see how you approached it. The work look great! Thanks for sharing your process.
I believe author would be surprised that it's not american, but soviet bunker :)
Houdini 16 brought tons of new possibilities that make the solution from SideFX great for game development. We’ve recently talked to Alexander Dracott about the features of Houdini 16 and how they can change your standard World Machine workflow, but there is more. Check out this talk by Scott Keating about all the new features found in Houdini 16 that will help game developers create procedural game art.
It is a nice in-depth look that covers all the essential things you should know about the new version. Have you tried using Houdini 16 for your game art? Make sure to share your results with us.