Hi. I can´t find documentation about Wind Directional Source, I only found out that strength is limited to [0, 1] values.
I would like to understand the difference between speed of wind and strength of wind.
Thank you.
As can be seen in the UE4 engine source code below the Direction and strength make up the X,Y,Z components and W is the speed component. For this function Speed is never used and this is only used for clothing on skeletal meshes.
http://i.imgur.com/TEYolfh.png
But in this function, used for speed tree, it sets the speed tree’s strength to be the speed parameter and the speed tree’s velocity is the X,Y,Z from this function as shown in the two screen shots below. So the strength or speed depends on how you are using it. So from what I can tell the speed is only used for speed tree’s wind generator. Look in the engine source for “FSpeedTreeWind” if you want to see how it is used. It is a full-on wind generator.
Strength controls how multiple wind sources are combined when there are multiple. You can make one source apply more, even if another source is closer. Speed is how fast the wind is.
Little confusing with the SpeedTree SDK, where strength is the wind’s strength (aka speed). But that isn’t revealed anywhere in the GUI. Speed is what you should edit, and SpeedTree expects values between 0 and 1.