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Second Life Creation

llWind

vector llWind(vector Offset)

Returns the wind velocity at the object position + Offset.

Parameters
Offset (vector)
Technical Details
  • Return Type: vector
  • Energy: 10

Basic Wind Velocity

Section titled “Basic Wind Velocity”
default
{
    touch_start(integer num)
    {
        llSay(0, "Wind velocity: " + (string)llWind(ZERO_VECTOR));
    }
}

Wind as Angle and Speed

Section titled “Wind as Angle and Speed”

This example interprets the wind vector as a compass direction and speed in meters per second:

// 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

Section titled “Notes”

The offset parameter allows you to query wind velocity at positions relative to the prim’s current location.

Issues

Section titled “Issues”
  • Wind effects rendered by the viewer may not always match the actual wind velocity returned by this function

See Also

Section titled “See Also”
  • llCloud
  • Weather systems in Second Life
  • Moderated in-world wind techniques