/// <summary>
/// Computes current position and orientation in the curve
/// </summary>
/// <param name="gameTime">Game time</param>
/// <param name="manipulator">Manipulator to update</param>
public override void UpdateManipulator(GameTime gameTime, Manipulator3D manipulator)
{
if (this.HasPath)
{
var target = this.path.GetNextControlPoint(this.path.Length);
var position = manipulator.Position;
float dToTarget = (target - position).Length();
if (dToTarget > this.ArrivingThreshold)
{
float maxSpeed = this.MaximumSpeed * gameTime.ElapsedSeconds;
this.pathTime += maxSpeed;
var next = this.path.GetPosition(this.pathTime);
this.Velocity = next - position;
manipulator.SetPosition(next, true);
manipulator.LookAt(next + this.Velocity, false, 0, true);
}
else
{
this.Clear();
}
}
}
/// <summary>
/// Updates the manipulator's view and position
/// </summary>
/// <param name="gameTime">Game time</param>
/// <param name="manipulator">Manipulator</param>
public override void UpdateManipulator(GameTime gameTime, Manipulator3D manipulator)
{
if (this.HasPath)
{
var target = this.path.GetNextControlPoint(this.path.Length);
var position = manipulator.Position;
float dToTarget = (target - position).Length();
if (dToTarget > this.ArrivingThreshold)
{
float maxSpeed = this.MaximumSpeed * gameTime.ElapsedSeconds;
float maxForce = this.MaximumForce * gameTime.ElapsedSeconds;
var next = this.path.GetNextControlPoint(this.pathTime + maxSpeed);
// A vector pointing from the location to the target
var desired = (next - position);
float dToNext = desired.Length();
if (dToNext != 0)
{
if (dToTarget < this.ArrivingRadius)
{
var m = Map(dToTarget, 0, this.ArrivingRadius, 0, maxSpeed);
desired = Vector3.Normalize(desired) * m;
}
else
{
desired = Vector3.Normalize(desired) * maxSpeed;
}
// Steering = Desired minus Velocity
var steer = desired - this.Velocity;
// Limit to maximum steering force
steer = steer.Limit(maxForce);
// Update velocity
this.Velocity += steer;
// Limit speed
this.Velocity = this.Velocity.Limit(maxSpeed);
this.pathTime += this.Velocity.Length();
var newPosition = this.path.GetPosition(this.pathTime);
var newNormal = this.path.GetNormal(this.pathTime);
manipulator.SetPosition(newPosition, true);
manipulator.LookAt(newPosition + (newPosition - position), newNormal, true, 0.1f);
}
}
else
{
this.Clear();
}
}
}