// Add separation or alignment forces if applicable.
private void separationAndAlignment()
{
// position and distance of fish at index
Vector3 pos = fish[fish_index].transform.position;
Quaternion rot = fish[fish_index].transform.rotation;
float dist = Vector3.Distance(transform.position, pos);
fish_script fishScript = fish[fish_index].GetComponent <fish_script>();
// if not this fish
if (dist > 0f && fishScript.isAlive == true)
{
// if within separation
if (dist <= separation_distance)
{
// compute the scale of separationt
float scale = separation_strength / dist;
// add a separation force between this fish and its neighbour
rigidbody.AddForce(scale * Vector3.Normalize(transform.position - pos));
}
else if (dist < cohesion_distance && dist > separation_distance) // if within cohesive distance but not separation
// compute the cohesive position
{
cohesion_pos = cohesion_pos + pos * (1f / (float)fish.Length);
// alignment - small rotations are applied based on the alignments of the neighbours
transform.rotation = Quaternion.RotateTowards(transform.rotation, rot, 10f);
}
// Wander forwards.
rigidbody.AddForce(transform.forward * speed);
}
}
// Find the closest fish to me.
private void findClosestFish()
{
GameObject fish = fishes[fish_index];
fish_script fishScript = fish.GetComponent <fish_script>();
if (fishScript.isAlive)
{
Vector3 fishPosition = fish.transform.position;
float fishDistance = Vector3.Distance(transform.position, fishPosition);
if (fishDistance < closestFishDistance)
{
closestFish = fish;
closestFishDistance = fishDistance;
}
}
fish_index++;
if (fish_index >= fishes.Length)
{
fish_index = 0;
finalClosestFish = closestFish;
closestFishDistance = 50f;
}
}
// Chase the closest fish.
private void chaseFish()
{
if (hunger >= hunger_threshold)
{
fish_script closestFishScript = finalClosestFish.GetComponent <fish_script>();
float step = 4.0f * Time.deltaTime;
Vector3 fishPosition = closestFish.transform.position;
float fishDistance = Vector3.Distance(transform.position, fishPosition);
Vector3 targetDir = fishPosition - transform.position;
Vector3 newDir = Vector3.RotateTowards(transform.forward, targetDir, step, 0.0F);
rigidbody.AddForce(-speed * Vector3.Normalize(transform.position - fishPosition));
transform.rotation = Quaternion.LookRotation(newDir);
// If the fish is quite close, eat the fish.
if (fishDistance < 2.0f)
{
closestFishScript.eatenByShark();
foodLevel += closestFishScript.foodValue;
}
}
}
public void set_fish_speed(float speed)
{
fish_script a_fish_script = (fish_script)fish.GetComponent(typeof(fish_script));
a_fish_script.fish_rotate_speed = speed;
}
