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87 lines
3.0 KiB
Plaintext
87 lines
3.0 KiB
Plaintext
/*
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* Author: esteldunedain
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* Update temperature of a weapon.
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*
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* Argument:
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* 0: Unit <OBJECT>
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* 1: Weapon <STRING>
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* 2: Heat increment (J) <NUMBER>
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*
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* Return value:
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* Current temperature <NUMBER>
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*
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* Example:
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* [player, currentWeapon player, 2000] call ace_overheating_fnc_updateTemperature
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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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params ["_unit", "_weapon", "_heatIncrement"];
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TRACE_3("params",_unit,_weapon,_heatIncrement);
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// get old values
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// each weapon has it's own variable. Can't store the temperature in the weapon since they are not objects unfortunately.
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private _tempVarName = format [QGVAR(%1_temp), _weapon];
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private _timeVarName = format [QGVAR(%1_time), _weapon];
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private _temperature = _unit getVariable [_tempVarName, 0];
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private _lastTime = _unit getVariable [_timeVarName, 0];
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private _barrelMass = 0.50 * (getNumber (configFile >> "CfgWeapons" >> _weapon >> "WeaponSlotsInfo" >> "mass") / 22.0) max 1.0;
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_fnc_cooling = {
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params ["_temperature", "_barrelMass", "_totalTime"];
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// If a long time passed since the last shot, there's no need to calculate anything; the weapon should be cool
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if (_totalTime > 1800) exitWith {0};
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//AR-15 (0.00570m bullet diameter) (barrel diameter usually 0.75" or 0.008255m radius)
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//Steel Denisty = 7850 m^3 / kg
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//Area of a cylinder (2/r)*(Pi * r^3 + V) - for a 0.008255m radius barrel -> Area = 210(1/meters) * Volume
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//Adjusted volume for being hollowed out is ~1.1x
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//So Area = 210 * 1.1 * (mass / 7850) = mass * 0.029427 (for steel near that diameter)
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private _barrelSurface = _barrelMass * 0.029427;
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TRACE_4("cooling",_temperature,_totalTime,_barrelMass,_barrelSurface);
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private _time = 0;
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while {true} do {
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private _deltaTime = (_totalTime - _time) min 20;
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_temperature = _temperature - (
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// Convective cooling
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25 * _barrelSurface * _temperature
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// Radiative cooling
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+ 0.4 * 5.67e-8 * _barrelSurface *
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( (_temperature + 273.15)*(_temperature + 273.15)
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* (_temperature + 273.15)*(_temperature + 273.15)
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- 273.15 * 273.15 * 273.15 *273.15 )
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) * _deltaTime / (_barrelMass * 466);
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if (_temperature < 1) exitWith {0};
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if (isNil "_temperature") exitWith {
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diag_log text format ["[ACE] ERROR: _totalTime = %1; _time = %2; _deltaTime = %3;", _totalTime, _time, _deltaTime];
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0
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};
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_time = _time + _deltaTime;
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if (_time >= _totalTime) exitWith { _temperature max 0 };
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};
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};
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// Calculate cooling
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_temperature = [_temperature, _barrelMass, ACE_time - _lastTime] call _fnc_cooling;
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TRACE_1("cooledTo",_temperature);
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// Calculate heating
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// Steel Heat Capacity = 466 J/(Kg.K)
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_temperature = _temperature + _heatIncrement / (_barrelMass * 466);
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// Publish the temperature variable
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[_unit, _tempVarName, _temperature, TEMP_TOLERANCE] call EFUNC(common,setApproximateVariablePublic);
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// Store the update time locally
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_unit setVariable [_timeVarName, ACE_time];
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_temperature
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