llAirPressure()

float llAirPressure(vector offset)

Returns the air pressure at the current position + offset.

How air pressure works:

* The X and Y values in the vector are irrelevant (air pressure is based on absolute height).
* It returns a float value of air pressure in KiloPascal.

The math for this function is easy enough to implement, but can anyone see any real use for it? Other than the obvious air pressure gauge. Would making it an actual LSL function prompt anyone to use it more often then calculating the pressure via math? I am rather curious if I am alone or not in my quest for more LSL weather functions, post if you have any thoughts on this function please and its potential usefulness or unusefulness.

~Cid

What would you use this for?

would it be possible to just fudge it by asserting a connection between cloud density and height?

*thinks*
wait doesn't this require alot of complex math? as currents of air would create local low pressures.
Why would i want this?

The moon direction function sounds interesting and useful for those who want to create night time shadows.

Not really since 1000 meters up has the same cloud density as 100000 meters up. The bulk of cloud density seems to be between 180-200 meters absolute sim height.


The way I see it there are two ways of doing it.

1. A close guess without taking llWind into account. (The probable choice sense it would be less resource intensive).

2. Use llWind data extrapolated on top of the base line readings for the current altitude. This would probably need a throttle on it so you can't call it too often, perhaps 0.2 seconds.

Either way both do require a small bit of "Advanced Math" but it isn't too dificult to achive via LSL. I have on older script that does 1., and a newer one that does 2. while taking llWind into account. They are "doable" already, I would just like to see if anyone besides 3-4 people would be interested in it as an actual function. If a small group are, I will hound LL to get it on there for ages if I have to.



I'm still working on that one too. I can't find a good reason "for it", but I also can not find a reason "against it" especially since it is already doable.



Yes! I'm hoping that if we get this function, LL may toss around the idea of speeding up the moon's orbit and rotating it, so that we can have moon cycles as well as a more dynamic sky overall.

Could be interesting for some vehicles, such as hot air balloons. You could create a realistic balloon whose lift characteristics and ultimate max height was determined by the vagaries of the surrounding air pressure systems. Couple this with some kind of system for simulating updrafts/downdrafts from wind direction and ground slope data, and you could come up with some pretty realistic gliders, too. It's a shame you can't remotely detect prim and ground colors. Thermals rising off of the huge black-box clubs and lengths of black asphalt Linden roads could be fun, too.

Is there a demand for this? Who knows.

Thank you, I knew there had to be *some* reason to have it. Now I can grab on to it like a pitbull.

I'll weigh in on this!

I'd be much more excited to have llGetTemperature(). Then we could analyze the seasons, and know when to dress more warmly.

Sure, pressure would be nice, too...

I built a small orbital tracker, it has discovered that the sun and the moon don't follow the same course in the sky! Very curious orbits, but explains the 3:1 day:night cycle very clearly. You can see the tracker on a platform around Alice (128,20,700) or so. It's near one of the platform corners. It has rendered a simple model of the heavens.

llGetCelestialBodyDirection(string celestialBodyName)...

llFluidDynamics(integer brainASplode);

Need I say more?

llWaterPressure would rock too. I've always wanted to build a realistic sub. Been too lazy to work out the math for the depths. Not to mention too lazy to build any subs.

You can stop by the weather archives in Neualtenburg to see the temperature. You need air pressure to calculate temperature. The seasons themselves are goverened by the sun direction and its slight movement throughout the SL year.

I'm activly working on this one.... just as soon as I can figure out the saturated vapor pressure for SL!

I decided to go ahead and do this and put off evaportation rates for later. This is a close approximation to water Pressure.

float Water_Pressure;
vector Position;
default
{
    touch_start(integer total_number)
    {
        Position = llGetPos();
        if(llWater(ZERO_VECTOR) > Position.z)
        {
            Water_Pressure = (9.8 * (llWater(ZERO_VECTOR) - Position.z));
            llSay(0, "Current water pressure is :" + (string)Water_Pressure + " Pascal");
        }
    }
}