Skyrim utilizes the Creation Engine, a game engine developed internally by Bethesda. SpeedTree was used to produce flora for previous games; instead of this, flora is produced using Bethesda's own technology. The developer states that this allows more detail in flora the technology allows designers to assign tree branches different weights, determining how wind affects the tree. Wind also affects the game world in other areas too, such as by determining the flow and direction of water in rivers and streams. The engine allows snow to fall dynamically, scanning the game world and then determining where and how snow falls upon the terrain. Character and creature animations in Skyrim are generated with Havok's Behavior toolset. It allows characters to fluidly cycle between walking, jogging and running, as well as increasing the efficiency of the third-person camera