Circle zoo

Imagine zoo that designed like a a lot of bridge connected circle spaces. At biggest radius we have predators that like to run at huge open spaces. At lower radius we will have animals that dont need so much space like turtles etc, That way animals that like to run will have endless way to run.

SpeedTree optimization

All we know that on proper distance SpeedTree convert mesh into a billboard. And there is a lot of billoboards rendered at same time that dramatically use GPU resources. What if cover all non transparent area of billboards with polygons like 2D game do and save fillrate.