Determine if unit is outside a building?

[surfer 42]

As the title says I would like to run a test for units that are not inside buildings. This is what I've got but it's far from being perfect:

{
if ((_x distance (nearestbuilding getpos _x)) > 10) then
	{
// get damaged by heavy rain etc.
}
} forEach allUnits;

Unfortunately this doesn't account if the building is small or large, so on small buildings 10 m from the center you're still standing inside. Vice versa for large buildings.

I'm sure there's a more elegant way. Thanks for sharing! :-)

Edited July 16, 2014 by Surfer

[Grumpy Old Man 3545]

You could use lineIntersectsObjs to draw a line from unit position to 20m above the units position and let the filter detect any buildings.

This way units will still get damaged when standing under a tree (doesn't really offer too much protection from rain etc.)

Might be what you're looking for.

[surfer 42]

Thanks, Grumpy Old Man,

How would I have to adapt the below code to get it to work, please? I know the +[0,0,20] is adding to the end of the array which is wrong but don't know how to achieve what I want.

 if	(lineintersectsobjs [getpos _x, (getpos _x +[0,0,20])]) = nul then
	{
	hint "unit is outside building";
	};
} foreach allUnits;

[Grumpy Old Man 3545]

You'd want to use getposATL or ASL since both are way faster, especially when checking on multiple units.

As starting position you use:

getposATL _x;

Endposition:

[(getposATL _x select 0),(getposATL _x select 1),(getposATL _x select 2)+20];

Cheers

[squeeze 22]

Have you tried boundingbox on a house object, I haven't used that command in years but I think it's worth a look at

[surfer 42]

@Grumpy Old Man, I think we are close but there's an error in this and I'm not experienced enough to find it. Can you help once more please?

 {
if	((lineintersectsobjs [getposATL _x, [(getposATL _x select 0),(getposATL _x select 1),(getposATL _x select 2)+20]]) == []) then
{
	// bad things coming if you didn't find shelter
	};
} foreach allunits;

[5133p39 14]

some time ago i put together a function to test something, maybe you can alter it to your purpose...

private ["_unitPos","_offsetASL","_X","_Y","_Z","_o","_objects","_result"];
// usage:   _unit call fIsUnitUnderRoof;
// returns objNull, or the house/object the unit is underneath
#define BEAM_LENGTH 10

_unitPos = getPosASL _this;
_offsetASL = _unitPos Distance (getPosATL _this); // TODO: for debugging, remove later
_unitPos Set [2, (_unitPos select 2) + 1.3]; // add something so the beam wont start at character feet where it could intersect with building stairs or furniture
_X = _unitPos select 0;
_Y = _unitPos select 1;
_Z = _unitPos select 2;
_o = objNull;
_result = objNull;

// Simplified calculation of triangle points offsets from the centroid (player pos)
// offset A = [    0,    -1]
// offset B = [-0.95, +0.65]
// offset C = [+0.95, +0.65]

_objects = lineIntersectsWith [[_X,_Y - 1,_Z], [_X,_Y - 1,_Z + BEAM_LENGTH], _this, _this, true]; // point A
drawLine3D [[_X,_Y - 1,_Z - _offsetASL], [_X,_Y - 1,_Z + BEAM_LENGTH - _offsetASL], [0,0,1,1]]; // TODO: for debugging, remove later
if (count _objects > 0) then {
_o = _objects select 0;
_objects = lineIntersectsWith [[_X - 0.95,_Y + 0.65,_Z], [_X - 0.95, _Y + 0.65, _Z + BEAM_LENGTH], _this, _this, true];  // point B
drawLine3D [[_X - 0.95,_Y + 0.65,_Z - _offsetASL], [_X - 0.95, _Y + 0.65, _Z + BEAM_LENGTH - _offsetASL], [0,0,1,1]]; // TODO: for debugging, remove later
if (count _objects > 0) then {
	if (_o == _objects select 0) then {
		_objects = lineIntersectsWith [[_X + 0.95,_Y + 0.65,_Z], [_X + 0.95, _Y + 0.65, _Z + BEAM_LENGTH], _this, _this, true];  // point C
		drawLine3D [[_X + 0.95,_Y + 0.65,_Z - _offsetASL], [_X + 0.95, _Y + 0.65, _Z + BEAM_LENGTH - _offsetASL], [0,0,1,1]]; // TODO: for debugging, remove later
		if (count _objects > 0) then {
			if (_o == _objects select 0) then {_result = _o};
		};
	};
};

};

drawLine3D [[_X, _Y -1, 0.1], [_X -0.95, _Y +0.65, 0.1], [0,0,1,10]]; // TODO: for debugging, remove later
drawLine3D [[_X -0.95, _Y +0.65, 0.1], [_X +0.95, _Y +0.65, 0.1], [0,0,1,1]]; // TODO: for debugging, remove later
drawLine3D [[_X, _Y -1, 0.1], [_X +0.95, _Y +0.65, 0.1], [0,0,1,1]]; // TODO: for debugging, remove later

_result

[IndeedPete 1038]

@Grumpy Old Man, I think we are close but there's an error in this and I'm not experienced enough to find it. Can you help once more please?

 {
if	((lineintersectsobjs [getposATL _x, [(getposATL _x select 0),(getposATL _x select 1),(getposATL _x select 2)+20]]) == []) then
{
	// bad things coming if you didn't find shelter
	};
} foreach allunits;

Can you post the error?

[surfer 42]

Don't know how to copy & paste from the error, so I'm writing it down:

|#| == type Array, expected Number in line 2

---------- Post added at 10:31 ---------- Previous post was at 10:28 ----------

Thanks Squeeze, I found some old code regarding boundigbox but I hoped there would be a more streamlined option.

Also thanks, 5133p39, but this code to me is just "$%&§$&"§%&/%/$%/$%/""§$", hehe :confused:

[IndeedPete 1038]

Ah, as expected, the comparison (==) fails. Try (untested):

{
if (count(lineIntersectsObjs [(getposATL _x), [(getposATL _x select 0),(getposATL _x select 1),((getposATL _x select 2) + 20)]]) == 0) then {
	// bad things coming if you didn't find shelter
   };
} forEach allUnits;

[Larrow 2821]

Remember to use ASL co-ordinatess else you will find your results are wrong. Either GetPosASL or ATLtoASL (GetPosATL #).

Have you tried boundingbox on a house object, I haven't used that command in years but I think it's worth a look at

I thought about suggesting that aswell Squeeze, trouble is on alot of houses the bounding area extends way past the model.

[surfer 42]

Thanks to Larrow I've changed the getpos to ASL and now it works like a charm! It's not restricted to houses for cover but trees and roofs and probably a lot of other stuff all give cover which is absolutely fine for me. I'm super happy now! Thanks everybody! This community rocks!!!

Here's the working code:

{
if (count(lineIntersectsObjs [(getposASL _x), [(getposASL _x select 0),(getposASL _x select 1),((getposASL _x select 2) + 20)]]) == 0) then
{
	// bad things happening if you didn't find cover
   };
} forEach allUnits;

Edited July 16, 2014 by Surfer