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35 lines
836 B
Plaintext
35 lines
836 B
Plaintext
/*
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* Author: Ruthberg
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*
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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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* 0: _this - world position <posASL>
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*
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* Return Value:
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* 0: roughness length <NUMBER>
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*
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* Public: No
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*/
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#include "script_component.hpp"
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private ["_roughness_lengths", "_windSource", "_nearBuildings", "_isWater"];
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// Source: http://es.ucsc.edu/~jnoble/wind/extrap/index.html
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_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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_windSource = _this vectorDiff ((vectorNormalized ACE_wind) vectorMultiply 25);
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_nearBuildings = count (_windSource nearObjects ["Building", 50]);
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_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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