Wind in SL --> in 'Debug/HUD info/Wind' : why 2 wind vectors ?

HI,
In 'Debug/HUD info/Wind' I see 2 entries for wind vectors. One is 'RWind' ( see the 'R' )and the other simply 'Wind'. What's the difference ??
Tech-info :
Client v1.11.3(1) Aug 8 2006 14:55:13 - Mac PowerPC

Looks to me that RWind vec is the relative velocity with respect to your avatar whereas Wind vector is the Wind in global coordinates at your avatars position. Similarly, RWind vel is the relative wind velocity (magnitude of the vector) and Wind velocity is the global again.

Hi nand, thanks for your insightful answer. I also did get an answer from one of Lindens :

"
...

I think what you are describing is referring to rotation values
(RWIND).. if you look at the clouds they go round and don't float across
borders.It does have three numbers, which would be enough for rotation
(essentially the direction of wind as X, Y Z), while the WIND one is
simply speed.

Hope this information helps.

Regards,

Cleopetra Linden

...

"

I believe my answer is the correct one (though I would, wouldn't I). Standing in a sim facing East (use mouselook and look at the hoizon with mini-map or the full map to align your view with East) you will not that the numbers for RWind vec and Wind vector are equal. Now turn 180degrees to look at West, x and y components of RWind are now negated but the magnitude is equal to Wind vector. Finally, turn to North or South and you will see that the x component and y component switch and are plus/minus depending upon North or south (I forget and can't check now as I'm at work).

To recap:
When standing still
Facing East
RWind = <x,y,z> Wind = <x,y,z>
Facing West
RWind = <-x,-y,z> Wind = <x,y,z>
Facing South/North
RWind = <+-y, +-x,z> Wind = <x,y,z>
Facing North/South
RWind = <-+y, -+x,z> Wind = <x,y,z>

Note that the RWind value is dependant upon the angle you are looking from, if you look up the RWind value will compensate, hence why I mentioned looking to the horizon.

More information on the Cloud/Wind relationship can be found in the wiki at:
http://secondlife.com/badgeo/wakka.php?wakka=weather
Though I remember reading some more in-depth notes on this I'm afraid I don't know where.