void Awake()
{
_pheromoneConfiguration = GetComponent <GlobalPheromoneConfiguration> ();
_type = PheromoneTypes.None;
_canReleasePheromone = false;
_placementTimer = 0.0f;
}
Vector3 FindMovmementDirection(PheromoneTypes pheromoneType)
{
Pheromone pheromone = _closestPheromone;
Vector3 movementVector = new Vector3();
Vector3 position = transform.position;
// check that pheromone still exists
if (!pheromone)
{
return(Vector3.zero);
}
Vector3 pheromonePosition = pheromone.transform.position;
Vector3 pheromoneVector = (pheromonePosition - position).normalized;
// find angle of pheromone
float pheromoneAngle = Vector3.Dot(transform.forward, pheromoneVector);
if (pheromoneAngle > _currentSmellAngle)
{
// weight added to concentration
movementVector += pheromoneVector * pheromone.currentConcentration;
}
if (pheromoneType == PheromoneTypes.Fear || pheromoneType == PheromoneTypes.Pain)
{
return(-movementVector);
}
return(movementVector);
}
public void Initialize(PheromoneTypes type, float intensity, float diameter, float diffusionRate, float minimumConcentration, Color color)
{
this.type = type;
startIntensity = intensity;
_diffusionRate = diffusionRate;
_minimumConcentration = minimumConcentration;
diffusionSphere.transform.localScale = new Vector3(diameter, diameter, diameter);
// max radius = (n / (3/4 * PI * c))^(1/3)
float maxRadius = Mathf.Pow(startIntensity / (0.75f * Mathf.PI * _minimumConcentration), 1f / 3f);
float ttl = maxRadius / _diffusionRate;
// Initialize particle system
var main = particleSystem.main;
main.startLifetime = ttl; //Mathf.Pow ((0.75f * _startIntensity) / (_minimumConcentration * Mathf.PI), 1f / 3f) / diffusionRate + 3.0f;
main.startSpeed = diffusionRate * 0.5f;
main.startColor = color;
ParticleSystem.EmissionModule emission = particleSystem.emission;
emission.rate = new ParticleSystem.MinMaxCurve(0f);
ParticleSystem.ShapeModule shape = particleSystem.shape;
shape.radius = diameter * 0.5f;
particleSystem.Emit((int)(50.0f * startIntensity));
_currentVisibility = true;
calculateCurrentConcentration();
}
// Update is called once per frame
// updates movement based on pheromones
void Update()
{
_currentSmellAngle = Mathf.Cos(_boidConfiguration.smellAngle);
// vector for pheromones set depending on nearest
PheromoneTypes type = PheromoneTypes.None;
Vector3 movementDirection = Vector3.zero;
// check if pheromone still exists
if (!_closestPheromone)
{
return;
}
else
{
type = _closestPheromone.type;
}
switch (type)
{
case PheromoneTypes.Food:
// returns attraction vector
movementDirection = FindMovmementDirection(type);
canAttractBoid = true;
break;
case PheromoneTypes.Fear:
// returns repellent vector
movementDirection = FindMovmementDirection(type);
canAttractBoid = false;
break;
default:
break;
}
// if movement direction changes
if (movementDirection.sqrMagnitude > 0.0f)
{
// set direction of the boid weight depends on movement sign
if (canAttractBoid)
{
boid.toPheromone = movementDirection * .05f;
}
else if (!canAttractBoid)
{
boid.toPheromone = movementDirection * .99f;
}
}
}
// call to place specific type of pheromone
public void PlacePheromone(Vector3 position, PheromoneTypes type)
{
PheromoneConfiguration pheromoneConfiguration = _pheromoneConfiguration.configs[type];
float initialIntensity = pheromoneConfiguration.initialIntensity;
float initialScale = pheromoneConfiguration.initialRadius;
float diffusionRate = pheromoneConfiguration.diffusionRate;
float minimumConcentration = pheromoneConfiguration.minimumConcentration;
Color color = pheromoneConfiguration.color;
// instantiates the pheromone prefab in position
GameObject newPheromone = Instantiate(pheromonePrefab, position, new Quaternion()) as GameObject;
// initialize and visualizes new pheromone gameobject through pheromone script
newPheromone.GetComponent <Pheromone>().Initialize(type, initialIntensity, initialScale, diffusionRate, minimumConcentration, color);
}
public void SetPheromoneType(PheromoneTypes type)
{
_type = type;
}
