private void OnCollisionEnter(Collision collision)
{
if (mState != AlState.MovingToFood && mState != AlState.LookingForFood)
{
//ignore the collision if the life form doesn't actively wants to eat
return;
}
//check if collusion object still exists
if (collision != null && collision.gameObject != null)
{
//is it food?
Food f = collision.gameObject.GetComponent <Food>();
if (f != null && f.IsEaten == false)
{
if (status._Eaten < Config.Status.MAX_FOOD)
{
if (VERBOSE_LOG)
{
Debug.Log(this.gameObject.name + " ate " + f.name);
}
//Using Destroy alone will make the results undeterministic as it
//depends on the CPU time / FPS when the object will actually be deleted
f.Eat();
f.gameObject.SetActive(false);
Destroy(f.gameObject);
status._Eaten++;
if (status._Eaten == Config.Status.MAX_FOOD)
{
mState = AlState.Napping;
}
}
}
}
}
public void SimulationStep(int step)
{
if (step % Simulation.STEPS_PER_SEC == 0)
{
mRandomDir = GetRandomDir();
}
if (mState == AlState.LookingForFood)
{
//move into random direction
Move(mRandomDir);
//Check if we find any fod
Collider[] res = Physics.OverlapSphere(this.mRb.position, properties._ViewDistance, Food.GetLayerMask());
if (res != null && res.Length > 0)
{
//sort based on distance
Array.Sort(res, (Collider a, Collider b) => {
float dista = Vector3.Distance(this.mRb.position, a.attachedRigidbody.position);
float distb = Vector3.Distance(this.mRb.position, b.attachedRigidbody.position);
if (distb == dista)
{
return(0);
}
else if (distb < dista)
{
return(1);
}
else
{
return(-1);
}
});
//target closest food we find. Unity doesn't remove food immediately that is eaten
//so we also have to make sure we don't target food that was already eaten
foreach (var c in res)
{
Food f = c.GetComponent <Food>();
if (f.IsEaten == false)
{
//found food!
mState = AlState.MovingToFood;
mTarget = res[0].GetComponent <Food>();
if (VERBOSE_LOG)
{
float distance = Vector3.Distance(mTarget.rb.position, this.mRb.position);
Debug.Log(this.mRb.position + " found food at " + mTarget.rb.position + " " + distance);
}
}
}
}
}
else if (mState == AlState.MovingToFood)
{
if (mTarget != null && mTarget.IsEaten == false)
{
Vector3 dir = mTarget.rb.position - mRb.position;
dir.y = 0;
dir.Normalize();
Move(dir);
}
else
{
mState = AlState.LookingForFood;
}
}
if (this.mState != AlState.Dead)
{
//it fell off the platform -> dead
if (this.mRb.position.y < -10)
{
this.mState = AlState.Dead;
}
//died due to a change in status
if (status.IsAlive == false)
{
this.mState = AlState.Dead;
}
if (this.mState == AlState.Dead)
{
this.mRb.constraints = RigidbodyConstraints.None;
this.mRb.AddRelativeForce(new Vector3(0, 0, 1), ForceMode.Force);
}
}
}