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 :)
Basefount Technology has updated its crowd simulation software for Maya called Miarmy. Let’s have a look at the possibilities of v6.2.
Easy Cache Editing Solution
After simulation and caching, we can easily fix some small bugs in simulation by grouping and editing tools. And in the new version, we support layer cache and allow the agents inside being able to adapt terrain.
Redshift Full Support
Redshift renderer can now read the shader of each geometry and render everything correctly.
We can use logic to control the action agents will select to transit to next action in transition map along with exit trigger.
Colorize and Randomize Real Time Display
Before rendering, we can use the real-time display tool to preview and verify agents geometries. And in this new version, we introduced randomize geometry and color on the display geometries.
More details can be found here.