mirror of
https://github.com/acemod/ACE3.git
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66 lines
2.2 KiB
Plaintext
66 lines
2.2 KiB
Plaintext
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#include "script_component.hpp"
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private ["_windSpeed", "_windDir", "_height", "_newWindSpeed", "_windSource", "_roughnessLength"];
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fnc_polar2vect = {
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private ["_mag2D"];
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_mag2D = (_this select 0) * cos((_this select 2));
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[_mag2D * sin((_this select 1)), _mag2D * cos((_this select 1)), (_this select 0) * sin((_this select 2))];
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};
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_windSpeed = vectorMagnitude ACE_wind;
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_windDir = (ACE_wind select 0) atan2 (ACE_wind select 1);
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// Wind gradient
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if (_windSpeed > 0.05) then {
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_height = (ASLToATL _this) select 2;
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_height = 0 max _height min 20;
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if (_height < 20) then {
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_roughnessLength = _this call FUNC(calculateRoughnessLength);
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_windSpeed = _windSpeed * ln(_height / _roughnessLength) / ln(20 / _roughnessLength);
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};
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};
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// Terrain effect on wind
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if (_windSpeed > 0.05) then {
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_newWindSpeed = 0;
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{
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_windSource = [100, _windDir + 180, _x] call fnc_polar2vect;
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if (!(terrainIntersectASL [_this, _this vectorAdd _windSource])) exitWith {
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_newWindSpeed = cos(_x * 9) * _windSpeed;
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};
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_windSource = [100, _windDir + 180 + _x, 0] call fnc_polar2vect;
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if (!(terrainIntersectASL [_this, _this vectorAdd _windSource])) exitWith {
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_newWindSpeed = cos(_x * 9) * _windSpeed;
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};
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_windSource = [100, _windDir + 180 - _x, 0] call fnc_polar2vect;
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if (!(terrainIntersectASL [_this, _this vectorAdd _windSource])) exitWith {
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_newWindSpeed = cos(_x * 9) * _windSpeed;
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};
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} forEach [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
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_windSpeed = _newWindSpeed;
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};
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// Obstacle effect on wind
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if (_windSpeed > 0.05) then {
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_newWindSpeed = 0;
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{
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_windSource = [20, _windDir + 180, _x] call fnc_polar2vect;
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if (!(lineIntersects [_this, _this vectorAdd _windSource])) exitWith {
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_newWindSpeed = cos(_x * 2) * _windSpeed;
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};
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_windSource = [20, _windDir + 180 + _x, 0] call fnc_polar2vect;
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if (!(lineIntersects [_this, _this vectorAdd _windSource])) exitWith {
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_newWindSpeed = cos(_x * 2) * _windSpeed;
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};
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_windSource = [20, _windDir + 180 - _x, 0] call fnc_polar2vect;
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if (!(lineIntersects [_this, _this vectorAdd _windSource])) exitWith {
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_newWindSpeed = cos(_x * 2) * _windSpeed;
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};
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} forEach [0, 5, 10, 15, 20, 25, 30, 35, 40, 45];
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_windSpeed = _newWindSpeed;
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};
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_windSpeed = 0 max _windSpeed;
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_windSpeed
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