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35 lines
847 B
Plaintext
35 lines
847 B
Plaintext
#include "script_component.hpp"
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/*
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* Author: Ruthberg
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* Calculates the terrain roughness length at a given world position
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*
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* Arguments:
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* world position <posASL>
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*
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* Return Value:
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* roughness length <NUMBER>
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*
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* Example:
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* (getPosASL player) call ace_weather_fnc_calculateRoughnessLength
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*
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* Public: No
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*/
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// Source: http://es.ucsc.edu/~jnoble/wind/extrap/index.html
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#define ROUGHNESS_LENGTHS [0.0002, 0.0005, 0.0024, 0.03, 0.055, 0.1, 0.2, 0.4, 0.8, 1.6]
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private _windSource = _this vectorDiff ((vectorNormalized wind) vectorMultiply 25);
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private _nearBuildings = count (_windSource nearObjects ["Building", 50]);
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private _isWater = surfaceIsWater _windSource;
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if (_nearBuildings == 0 && _isWater) exitWith {
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0.0005
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};
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if (_nearBuildings >= 10) exitWith {
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1.6
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};
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ROUGHNESS_LENGTHS select (2 + (_nearBuildings min 6))
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