- I generated a noise map for the terrain, which I use to set the height of each vertex
- Using the same noise map I texture the terrain blue,green, grey at different height thresholds
- I modified the frost mesh to also use the same height map, offset slightly so it's just under the ground. As the frost spreads it moves up and pokes through the ground
- I then used the colors to make the frost spread quickly on water and slower on rock
And a quick change of a seed value generates a new map, causing the frost to spread in a completely different way:
I will spawn the trees you need to build and fuel your defenses on the green, you won't be able to build on the blue, but you'll want to keep your structures on the grey where the frost moves slowest
And if you want to follow along and see what open ideas/questions I have, you can view my trello here