private void Awake()
{
flock = GetComponent <Boids>();
}
public void Update()
{
/* Flock simulation */
Vector3 center = new Vector3();
Vector3 inertia = new Vector3();
Vector3 tmp = new Vector3();
int proximate;
float t;
t = Time.deltaTime;
if (t > 0.1)
{
t = 0.1f; // Limit the extrapolation to something reasonable
}
/* Get the overall characteristics of all the boids in the simulation */
Boids[] allFlocks;
if (globalInfluence) // My flock is influenced by the other flocks
{
allFlocks = this.transform.parent.GetComponentsInChildren <Boids>();
}
else // My flock ignores all the other flocks
{
allFlocks = new Boids[1];
allFlocks[0] = this;
}
int totalBoidsCount = 0;
foreach (Boids anyboids in allFlocks)
{
for (int i = 0; i < anyboids.numberLocalBoids; i++)
{
center = anyboids.boids[i].transform.localPosition + center; /* Flock center */
inertia = anyboids.boids[i].GetComponent <BoidState>().velocity + inertia; /* Flock inertia */
totalBoidsCount++;
}
}
center = center * (1.0f / (totalBoidsCount)); /* Take average to get flock center */
inertia = inertia * (inertia_factor * t);
/* This loop iterates over local boids only because we simulate change only to the local ones */
for (int i = 0; i < numberLocalBoids; i++)
{
Vector3 lcenter = new Vector3();
/* Flock Pull */
tmp = center - boids[i].transform.localPosition;
tmp = tmp * (pull_factor * t);
boids[i].GetComponent <BoidState>().velocity = tmp + boids[i].GetComponent <BoidState>().velocity;
/* Flock Inertia */
boids[i].GetComponent <BoidState>().velocity = inertia + boids[i].GetComponent <BoidState>().velocity;
/* Neighbor Avoidance */
proximate = 0;
foreach (Boids anyboids in allFlocks)
{
for (int j = 0; j < anyboids.numberLocalBoids; j++)
{
if (!(anyboids == this && i == j))
{
tmp = boids[i].transform.localPosition - anyboids.boids[j].transform.localPosition;
if (tmp.magnitude < proximity_distance)
{
proximate++;
lcenter = tmp + lcenter;
}
}
}
}
if (proximate > 0)
{
lcenter = lcenter * (proximity_factor * t);
boids[i].GetComponent <BoidState>().velocity = lcenter + boids[i].GetComponent <BoidState>().velocity;
}
/* Max velocity */
float speed = boids[i].GetComponent <BoidState>().velocity.magnitude;
if (speed > max_velocity)
{
boids[i].GetComponent <BoidState>().velocity *= max_velocity / speed;
}
/* Calc new position */
boids[i].transform.localPosition = boids[i].transform.localPosition + (boids[i].GetComponent <BoidState>().velocity *t);
/* World limits */
for (int j = 0; j < 3; j++)
{
if (boids[i].transform.localPosition[j] > bounds.center[j] + bounds.extents[j])
{
boids[i].GetComponent <BoidState>().velocity[j] *= -1f;
}
if (boids[i].transform.localPosition[j] < bounds.center[j] - bounds.extents[j])
{
boids[i].GetComponent <BoidState>().velocity[j] *= -1f;
}
}
}
}