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Selador Cellardoor
Registered User
Join date: 16 Nov 2003
Posts: 3,082
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02-11-2006 17:33
It appears from a recent thread about a sailing script that wind in second life does have a direction. But all I can find is llWind, a function that returns the wind velocity at a particular point.
Is there a way of determining wind direction that I have overlooked?
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Cid Jacobs
Theoretical Meteorologist
Join date: 18 Jul 2004
Posts: 4,304
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02-11-2006 17:36
default
{
state_entry()
{
llSetTimerEvent(1);
}
timer()
{
llSetLocalRot(llRotBetween(<1.0, 0.0, 0.0>, llWind(<0.0, 0.0, 0.0>)));
}
} |
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Selador Cellardoor
Registered User
Join date: 16 Nov 2003
Posts: 3,082
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02-11-2006 17:38
That's great - thank you.
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Cid Jacobs
Theoretical Meteorologist
Join date: 18 Jul 2004
Posts: 4,304
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02-11-2006 17:38
From: Selador Cellardoor That's great - thank you. No problem  . |
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Sky Honey
Coder
Join date: 16 May 2005
Posts: 105
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02-11-2006 20:12
From: Selador Cellardoor It appears from a recent thread about a sailing script that wind in second life does have a direction. But all I can find is llWind, a function that returns the wind velocity at a particular point.
Is there a way of determining wind direction that I have overlooked? Selador maybe you've already realized this from Cid's reply, but it took me way too long to understand this myself so I'll reiterate it here: a vector quantity can actually represent a speed and a direction. A velocity vector has x, y and z components that are the speed the object is moving in each of those planes. llVecNorm converts it into a unit vector, essentially removing the speed part to make the direction easier to work with. llVecMag combines the x,y and z speeds into the "net" speed of the object as a float. If that's a crappy explanation, please someone correct it! |