"The Tree and Fire Systems are part of the Intel Smoke Framework, a multi-threaded game engine.

"The Tree and Fire Systems are part of the Intel Smoke Framework, a multi-threaded game engine. Procedurally generated trees and procedurally generated fire were inspired by the need to generate a virtual burning forest."

At last someone addressed that need!
https://software.intel.com/en-us/articles/procedural-trees-and-procedural-fire-in-a-virtual-world/