LlWind: Difference between revisions
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More testing and observations. |
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{{LSL_Function | {{LSL_Function | ||
|inject-2={{LSL Function/offset|offset|noZ=*|sim=*}} | |||
|func=llWind | |func=llWind | ||
|sort=Wind | |sort=Wind | ||
| Line 9: | Line 10: | ||
|p1_name=offset | |p1_name=offset | ||
|func_footnote | |func_footnote | ||
|return_text=that is the wind velocity at the prim position + | |return_text=that is the wind velocity at the prim's [[llGetPos|position]] + {{LSLPT|offset}} | ||
|spec | |spec | ||
|caveats | |caveats | ||
|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) | |||
** This low resolution tends to result in smooth gradients of wind, however sudden and strong changes in wind speed and direction are possible. | |||
** Vortexes and are also possible, sometimes multiple in the same region. | |||
* 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. | |||
* Maximum wind speed can reach at least 20m/s. | |||
|examples= | |examples= | ||
< | <syntaxhighlight lang="lsl2"> | ||
default | default | ||
{ | { | ||
| Line 21: | Line 31: | ||
} | } | ||
} | } | ||
</ | </syntaxhighlight> | ||
<syntaxhighlight lang="lsl2"> | |||
// 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"); | |||
} | |||
} | |||
</syntaxhighlight> | |||
|helpers | |helpers | ||
|also_functions={{LSL DefineRow||[[llCloud]]}} | |also_functions={{LSL DefineRow||[[llCloud]]}} | ||
|also_articles={{LSL DefineRow||{{LSLGC|Weather}}|SL Weather information}} | |also_articles={{LSL DefineRow||{{LSLGC|Weather}}|SL Weather information}} | ||
{{LSL DefineRow||[[User:Dora_Gustafson/moderated_world_wind|Moderated in-world wind]]}} | |||
|notes | |notes | ||
|issues={{Issue|SVC-3131|llWind() and viewer wind effects do not match}} | |issues={{Issue/V1|SVC-3131|llWind() and viewer wind effects do not match}} | ||
|haiku={{Haiku|Softly blowing breeze|Calmly rustling through the tree|A gentle whisper}} | |||
|cat1=Region | |cat1=Region | ||
|cat2=Weather | |cat2=Weather | ||
Latest revision as of 09:01, 23 October 2025
| LSL Portal | Functions | Events | Types | Operators | Constants | Flow Control | Script Library | Categorized Library | Tutorials |
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)
- This low resolution tends to result in smooth gradients of wind, however sudden and strong changes in wind speed and direction are possible.
- Vortexes and are also possible, sometimes multiple in the same region.
- 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.
- Maximum wind speed can reach at least 20m/s.
See Also
Deep Notes
Signature |
|---|
function vector llWind( vector offset ); |
Haiku |
|---|
|
Softly blowing breeze
|