====== ArmA 1 Ambient Life Configs ======

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**ArmA 1** aka Armed Assault (ArmA)


====== Ambient Life Distribution ======

Ambien life is the birds, insects and possible other animals that are created/spawned around players area.

There is a probabilistic way to define ambient life distribution, depending on current time, place and weather conditions, defined in **CfgWorlds**.

Layer cost and species probability use Simple Expressions.

Ambient Parameters which can be used inside of expressions:

As far as probabilities are considered, for each Species class, the probabilities need sum to one. In the following example, for instance:
<code>
probability = "deadBody + (1 - deadBody) * (0.5 - forest * 0.1 - meadow * 0.2)";
probability = "(1 - deadBody) * (0.5 - forest * 0.1 + meadow * 0.2)";
probability = "(1 - deadBody) * (0.2 * forest)";
</code>

Which really sums into one, as one can easily check:
<code>
sum = deadBody + (1 - deadBody) * (0.5 - 0.1 * forest - 0.2 * meadow + 0.5 - 0.1 * forest + 0.2 * meadow + 0.2 * forest) =
    = deadBody + (1 - deadBody) * 1 = 1
</code>

More complete example follows:
<code>
class CfgWorlds
{
	class DefaultWorld
	{
		// ambient life configuration
		class Ambient
		{
			class SmallInsects
			{
				radius=3; // radius in meters, where ambient lives (distance from the player)
				cost="(10-5*hills)*(1-night)*(1-rain)*(1-sea)*(1-( (windy*2) min 1))"; //total number of all species
				// species configuration
				class Species
				{
					class HouseFly
					{
						probability="deadBody+(1-deadBody)*(0.5-forest*0.1-meadow*0.2)";
						cost=1; //when the fly lives, it pays this cost to the total sum cost SmallInsects::cost
					};
					class HoneyBee
					{
						probability="(1-deadBody)*(0.5-forest*0.1+meadow*0.2)";
						cost=1;
					};
					class Mosquito
					{
						probability="(1-deadBody)*(0.2*forest)";
						cost=1;
					};
				};
			};
		...
		};
	};
};
</code>

====== Basic ambient behaviour ======

Basic ambient behaviour is defined in cfgVehicles.hpp
<code>
class CfgNonAIVehicles
{
	class Bird
	{
		scope = private;
		model="";
		simulation = SeaGull; //which CPP class simulate ambient behaviour
		reversed = false;     //default is not reversed (ambients are oriented in other way, than a man)
		//straightDistance,minHeight,avgHeight and maxHeight can be overiden by randomMove fsm function
		minHeight=5;
		avgHeight=10;
		maxHeight=50;
		straightDistance=50;  // random move will use this to set the maximum distance, where to fly
		minSpeed=-0.5; // m/s
		maxSpeed=20;   // m/s
		acceleration = 7; //m/s^2
		turning = 1; // angular acceleration - relative (the higher, the more maneuvrable)
		flySound[]={"",db-30,1, 1};
		singSound[]={"",db-30,1, 1};
		canBeShot=true;  //birds can, insect cannot
		airFriction2[]={25,12,2.5};    //defines the matrix for computing friction
		airFriction1[]={1500,700,100}; //multiplying columns changes friction in given coordinate
		airFriction0[]={40,20,60};
	};
...
};
</code>

====== Ambient behaviour specialization ======

For particular species, default Bird or Insect values, defined in cfgVehicles.hpp can be specialized:
<code>
class CfgNonAIVehicles
{
	class Insect;
	class Bird;
	class ButterFly: Insect
	{
		model = "aglais_urticae.p3d";
		fsm[] = {"Butterfly"};     //there could be more FSMs for layered FSM system, but it is not implemented yet
		moves = CfgMovesButterfly; //animation subject is described on other place in wiki
		//straightDistance,minHeight,avgHeight and maxHeight can be overiden by randomMove fsm function
		straightDistance=2; // random move will use this to set the maximum distance, where to fly
		minHeight=-0.10;  // allow landing
		avgHeight=0.3;    // these Height values are used in random movement
		maxHeight=1.5;
		minSpeed=-0.1;    // autopilot tries to make ambient fly within this range
		maxSpeed=1;       // but it is modulated only in Z coordinate, yet (side speed is still problem)
		acceleration = 5; // m/s^2 this acceleration is used whenever possible. Ambient cannot fly with less effort.
		turning = 5;      // turning ability (less value, less turning ability)
		reversed = false; // model is oriented in other way, than a man. With true value, ambient flies backwards.
		autocenter = false; //important for proper rtm animation (bones mounted on proper place)
	};
...
};
</code>

====== Ambient Parameters ======

**Rain** 0..1 rain intensity\\
**Night** 0..1 night "intensity"\\
**Meadow** 0..1 how much does the surrounding have a character of a meadow\\
**Trees** 0..1 how many tress are growing in the area\\
**Hills** 0..1 how much is the place "hilly" (160 ASL -> 0, 400 ASL -> 1)\\
**Houses** 0..1 how many houses or other building are around\\
**Windy** 0..1 wind streght (0 m/s ->0, 20 m/s -> 1)\\
**Forest** 0..1 forest density\\
**DeadBody** 0..1 is the place close to a dead body? (0 m ->1, 10 m -> 0)\\
**Sea** 0..1 is the place close to a sea? (0 m->1, approx. 100 m->0)\\

Parameters can be combined into Simple Expressions, like:
<code>
meadow*(1-rain)*(1-night)
(10-5*rain)*(1-sea)*(windy factor [0.2,0.5])
</code>