public static IEnumerator <BTResult> FindAndEatSomething(Animal agent, Behavior <Animal> noNearbyFoodBehavior, Func <IEnumerable <Vector3> > getFoodSources, float hungerRestoredPerEat)
{
var lastFoodSearchPos = Vector3.Zero;
var foodSources = new Queue <Vector3>();
//While we're still hungry and don't have prey
while (agent.Hunger > Brain.HungerToStopEating)
{
foodSources.Clear();
while (foodSources.Count == 0)
{
//Look for food sources, if we havent checked already and found it empty or just killed an enemy animal
if (Vector3.WrappedDistance(lastFoodSearchPos, agent.Position) > 10 || (agent.TryGetMemory(Animal.IsAnimalKilledMemory, out bool isKilled) && isKilled))
{
foodSources.AddRange(getFoodSources());
lastFoodSearchPos = agent.Position;
agent.RemoveMemory(Animal.IsAnimalKilledMemory);
}
else //None found, get outta here
{
yield return(new BTResult(noNearbyFoodBehavior.Do(agent), "No food in 10m radius of last query. Moving till we're > 10m from last query."));
}
}
//Food sources available, find paths to them.
var routeProps = new RouteProperties()
{
MaxTargetLocationHeightDelta = agent.Species.ClimbHeight
};
while (foodSources.Count > 0 && Vector3.WrappedDistance(lastFoodSearchPos, agent.Position) < 10)
{
// Low-effort search for the first option or any other option visited while trying to hit the first with randomizing it in that area
var route = AIUtil.GetRouteToAny(agent.FacingDir, agent.Position, foodSources, agent.Species.GetTraversalData(true), out var targetPosition, 100, 20, agent.Species.HeadDistance, routeProps);
var target = targetPosition.Round;
var distanceToTarget = Vector3.WrappedDistanceSq(agent.Position, target);
// Move to target if it's far away
if (distanceToTarget > 2f)
{
if (!route.HasValue)
{
break;
}
agent.SetRoute(route.Value, AnimalState.LookingForFood, route.Value.EndPosition.Round);
yield return(BTResult.RunningChanged("walking to food"));
// Stop walking to food if the distance to it has changed or it disappeared
var agentTarget = agent.Target;
if (agentTarget == null || Vector3.WrappedDistanceSq(agentTarget.Value, target) > 2f)
{
break;
}
}
// Start eating food if it's close to us
if (Vector3.WrappedDistanceSq(target, agent.Position) <= 2f)
{
agent.ClearRoute();
agent.LookAt(target);
agent.ChangeState(AnimalState.Eating, 5, false);
agent.Hunger -= hungerRestoredPerEat;
yield return(BTResult.RunningChanged("chowing down"));
agent.LookAt(null);
lastFoodSearchPos = Vector3.Zero;
//Don't actually destroy the plant, because that's handled in the world layer simulation.
//var plant = EcoSim.PlantSim.GetPlant(targetPlantPosition.WorldPosition3i + Vector3i.Up);
//if (plant != null) EcoSim.PlantSim.DestroyPlant(plant, DeathType.EatenByAnimal);
}
}
}
}