LlWind

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/LSL

Wind

llWind

Summary

Function: vector llWind( vector offset );

0.0	Forced Delay
10.0	Energy

Returns a vector that is the wind velocity at the prim's position + offset

• vector

offset

–

offset relative to the prim's position and expressed in local coordinates

The requested position needs to be in the same region. Only the x and y coordinates in offset are important, the z component is ignored.

Examples

default
{
    touch_start(integer num)
    {
        llSay(0, "Wind velocity: " + (string)llWind(ZERO_VECTOR));
    }
}

// wind interpretation as angle and speed
default
{
    state_entry()
    {
        vector windVector = llWind( ZERO_VECTOR);
        float windSpeed = llVecMag( windVector);
        float windDirection = llAtan2( windVector.y, windVector.x);
        integer compassWind = ( 450 - (integer)( RAD_TO_DEG*windDirection))%360;
        llOwnerSay( "\nWind direction: "+(string)compassWind+"°\nWind speed: "+(string)windSpeed+" m/S");
    }
}

Notes

• Each region simulates its own wind with a random seed value, and chaos is scaled by the region's sun position.
  • While the simulation is performed on a 16x16 grid, the wind has perfect resolution anywhere between those cells. (interpolated)
• Neighboring regions influence each other at the connecting border, which may lead to cascading changes for either region.
• Regions without neighbors exhibit very uniform wind across the whole region.
  • Wind will occasionally change direction over time, but eventually stabilizes toward the new direction.

See Also

Functions

•

llCloud

Articles

•	Weather	–	SL Weather information
•	Moderated in-world wind

Deep Notes

Signature
function vector llWind( vector offset );

Haiku
Softly blowing breeze Calmly rustling through the tree A gentle whisper