public override Vector3 CalculateNeighborContribution(Vehicle other)
{
Vector3 steering = Vector3.zero;
// add in steering contribution
// (opposite of the offset direction, divided once by distance
// to normalize, divided another time to get 1/d falloff)
Vector3 offset = other.Position - Vehicle.Position;
var offsetSqrMag = offset.sqrMagnitude;
if (offsetSqrMag <= _maximumSeparationSquared)
{
steering = (offset / -offsetSqrMag);
if (_multiplierInsideComfortDistance != 1 && offsetSqrMag < _comfortDistanceSquared)
{
steering *= _multiplierInsideComfortDistance;
}
if (_vehicleRadiusImpact > 0)
{
steering *= other.ScaledRadius * Vehicle.ScaledRadius * _vehicleRadiusImpact;
}
}
return steering;
}
public override Vector3 CalculateNeighborContribution(Vehicle other)
{
// accumulate sum of forces leading us towards neighbor's positions
var distance = other.Position - Vehicle.Position;
var sqrMag = distance.sqrMagnitude;
if (sqrMag < _comfortDistanceSquared)
{
distance = Vector3.zero;
}
else
{
distance *= 1 / sqrMag;
}
return distance;
}
public override Vector3 CalculateNeighborContribution(Vehicle other)
{
// accumulate sum of neighbors' velocities
return other.Velocity;
}
protected virtual void Awake()
{
_vehicle = this.GetComponent<Vehicle>();
ReportedArrival = true; // Default to true to avoid unnecessary notifications
}
public float PredictNearestApproachTime(Vehicle other)
{
return PredictNearestApproachTime(other, Velocity);
}
/// <summary>
/// Predicts the time until nearest approach between this and another vehicle
/// </summary>
/// <returns>
/// The nearest approach time.
/// </returns>
/// <param name='other'>
/// Other vehicle to compare against
/// </param>
public float PredictNearestApproachTime(Vehicle other, Vector3 myVelocity)
{
// imagine we are at the origin with no velocity,
// compute the relative velocity of the other vehicle
Vector3 otherVelocity = other.Velocity;
Vector3 relVelocity = otherVelocity - myVelocity;
float relSpeed = relVelocity.magnitude;
// for parallel paths, the vehicles will always be at the same distance,
// so return 0 (aka "now") since "there is no time like the present"
if (relSpeed == 0) return 0;
// Now consider the path of the other vehicle in this relative
// space, a line defined by the relative position and velocity.
// The distance from the origin (our vehicle) to that line is
// the nearest approach.
// Take the unit tangent along the other vehicle's path
Vector3 relTangent = relVelocity / relSpeed;
// find distance from its path to origin (compute offset from
// other to us, find length of projection onto path)
Vector3 relPosition = Position - other.Position;
float projection = Vector3.Dot(relTangent, relPosition);
return projection / relSpeed;
}
/// <summary>
/// Calculates if a vehicle is in the neighborhood of another
/// </summary>
/// <param name="other">
/// Another vehicle to check against<see cref="Vehicle"/>
/// </param>
/// <param name="minDistance">
/// Minimum distance <see cref="System.Single"/>
/// </param>
/// <param name="maxDistance">
/// Maximum distance <see cref="System.Single"/>
/// </param>
/// <param name="cosMaxAngle">
/// Cosine of the maximum angle between vehicles (for performance)<see cref="System.Single"/>
/// </param>
/// <returns>
/// True if within the neighborhood, or false if otherwise<see cref="System.Boolean"/>
/// </returns>
/// <remarks>Originally SteerLibrary.inBoidNeighborhood</remarks>
public bool IsInNeighborhood(Vehicle other, float minDistance, float maxDistance, float cosMaxAngle)
{
bool result = false;
if (other != this)
{
Vector3 offset = other.Position - Position;
float distanceSquared = offset.sqrMagnitude;
// definitely in neighborhood if inside minDistance sphere
if (distanceSquared < (minDistance * minDistance))
{
result = true;
}
else
{
// definitely not in neighborhood if outside maxDistance sphere
if (distanceSquared > (maxDistance * maxDistance))
{
result = false;
}
else
{
// otherwise, test angular offset from forward axis
Vector3 unitOffset = offset / (float) Mathf.Sqrt (distanceSquared);
float forwardness = Vector3.Dot(Transform.forward, unitOffset);
result = forwardness > cosMaxAngle;
}
}
}
return result;
}
/// <summary>
/// Returns the distance from the this vehicle to another
/// </summary>
/// <returns>
/// The distance between both vehicles' positions. If negative, they are overlapping.
/// </returns>
/// <param name='other'>
/// Vehicle to compare against.
/// </param>
public float DistanceFromPerimeter(Vehicle other)
{
var diff = Position - other.Position;
return diff.magnitude - ScaledRadius - other.ScaledRadius;
}
/// <summary>
/// Given the time until nearest approach (predictNearestApproachTime)
/// determine position of each vehicle at that time, and the distance
/// between them
/// </summary>
/// <returns>
/// Distance between positions
/// </returns>
/// <param name='other'>
/// Other vehicle to compare against
/// </param>
/// <param name='time'>
/// Time to estimate.
/// </param>
/// <param name='ourPosition'>
/// Our position.
/// </param>
/// <param name='hisPosition'>
/// The other vehicle's position.
/// </param>
/// <param name='ourForward'>
/// Forward vector to use instead of the vehicle's.
/// </param>
public float ComputeNearestApproachPositions(Vehicle other, float time,
ref Vector3 ourPosition,
ref Vector3 hisPosition,
float ourSpeed,
Vector3 ourForward)
{
Vector3 myTravel = ourForward * ourSpeed * time;
Vector3 otherTravel = other.Transform.forward * other.Speed * time;
ourPosition = Position + myTravel;
hisPosition = other.Position + otherTravel;
return Vector3.Distance(ourPosition, hisPosition);
}
/// <summary>
/// Given the time until nearest approach (predictNearestApproachTime)
/// determine position of each vehicle at that time, and the distance
/// between them
/// </summary>
/// <returns>
/// Distance between positions
/// </returns>
/// <param name='other'>
/// Other vehicle to compare against
/// </param>
/// <param name='time'>
/// Time to estimate.
/// </param>
/// <param name='ourPosition'>
/// Our position.
/// </param>
/// <param name='hisPosition'>
/// The other vehicle's position.
/// </param>
public float ComputeNearestApproachPositions(Vehicle other, float time,
ref Vector3 ourPosition,
ref Vector3 hisPosition)
{
return ComputeNearestApproachPositions(other, time, ref ourPosition, ref hisPosition, Speed, Transform.forward);
}
public override Vector3 CalculateNeighborContribution(Vehicle other)
{
// accumulate sum of neighbor's heading
return other.Transform.forward;
}