public static Vector3 Evade(SteeringActor actor, SteeringActor pursuer)
{
SteeringBehaviours.Forces attributes = actor.GetAttributes().Forces;
Vector3 toPursuer = pursuer.GetPosition() - actor.GetPosition();
float lookAhreadTime = toPursuer.magnitude / (attributes.MaxSpeed + pursuer.GetVelocity().magnitude);
return Flee(actor, pursuer.GetPosition() + (Vector3)pursuer.GetVelocity() * lookAhreadTime);
}
public static float GetObstactleAvoidanceLookAheadDist(SteeringActor actor)
{
return 1.0f + actor.GetVelocity().magnitude * 2.0f;
}
public static Vector3 Pursuit(SteeringActor actor, SteeringActor evader)
{
SteeringBehaviours.Forces attributes = actor.GetAttributes().Forces;
Vector3 toEvader = evader.GetPosition() - actor.GetPosition();
Vector3 thisHeading = actor.GetVelocity();
thisHeading.Normalize();
Vector3 evaderHeading = evader.GetVelocity();
evaderHeading.Normalize();
float relativeHeading = Vector3.Dot(thisHeading, evaderHeading);
float tresholdAngleAcos = Mathf.Acos(attributes.PursuitThresholdAngle);
if (Vector3.Dot(toEvader, thisHeading) > 0 && (relativeHeading < -tresholdAngleAcos))
{
return Seek(actor, evader.GetPosition());
}
// the look ahead time is proportional to the distance between the evader
// and the pursuer; and is inversely proportional to the sum of the agents velocities
float lookAheadTime = toEvader.magnitude / (attributes.MaxSpeed + evader.GetVelocity().magnitude);
// Now seek to the predicted future position of the evader
return Seek(actor, evader.GetPosition() + (Vector3) evader.GetVelocity() * lookAheadTime);
}
