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Reduce or eliminate backblast cause by terrain depending on relative slope. Fix #294

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This commit is contained in:
esteldunedain 2015-04-03 18:22:04 -03:00
parent d1d6252299
commit 2b4d806925
1 changed files with 28 additions and 2 deletions
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30
addons/overpressure/functions/fnc_getDistance.sqf
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@ -15,15 +15,18 @@
EXPLODE_3_PVT(_this,_posASL,_direction,_maxDistance);
private ["_distance", "_interval", "_line", "_intersections"];
private ["_distance", "_interval", "_line", "_intersections", "_terrainIntersect", "_lastTerrainIntersect"];
_distance = _maxDistance;
_interval = _distance;
_line = [_posASL, []];
_terrainIntersect = false;
_lastTerrainIntersect = false;
while {
_interval > 0.1
} do {
_lastTerrainIntersect = _terrainIntersect;
_interval = _interval / 2;
_line set [1, _posASL vectorAdd (_direction vectorMultiply _distance)];
@ -32,9 +35,32 @@ while {
_x isKindOf "Static" || {_x isKindOf "AllVehicles"}
} count (lineIntersectsWith _line);
_distance = _distance + ([1, -1] select (_intersections > 0 || {terrainIntersectASL _line})) * _interval;
_terrainIntersect = if (_intersections > 0) then {
false
} else {
terrainIntersectASL _line
};
_distance = _distance + ([1, -1] select (_intersections > 0 || _terrainIntersect)) * _interval;
if (_distance > _maxDistance) exitWith {_distance = 999};
};
if (_distance > _maxDistance) exitWith {_distance};
// If the intersection was with the terrain, check slope
if (_terrainIntersect || _lastTerrainIntersect) exitWith {
private ["_slope","_angle"];
_slope = surfaceNormal (_posASL vectorAdd (_direction vectorMultiply _distance));
// Calculate the angle between the terrain and the back blast direction
_angle = 90 - acos (- (_slope vectorDotProduct _direction));
//systemChat format ["Angle: %1", _angle];
// Angles is below 25º, no backblast at all
if (_angle < 25) exitWith {_distance = 999};
// Angles is below 45º the distance is increased according to the difference
if (_angle < 45) exitWith {_distance = _distance * (5 - 4 * sqrt ((_angle - 25)/20))};
// Angles above 45º create full backblast
};
_distance