/// <summary>
/// Applies the Steering Force to the current Velocity and Speed values
/// </summary>
/// <param name="gameTime"></param>
/// <remarks>Override this method to modify how the computed Steering Force is applied</remarks>
public virtual void ApplySteeringForce(GameTime gameTime)
{
Vector3 newAcceleration = _steeringForce / Mass;
if (gameTime.ElapsedGameTime.TotalSeconds > 0)
{
float smoothRate = MathHelper.Clamp(9 * (float)gameTime.ElapsedGameTime.TotalSeconds, 0.15f, 0.4f);
MathExtensions.BlendIntoAccumulator(smoothRate, newAcceleration, ref _acceleration);
}
Velocity += _acceleration * (float)gameTime.ElapsedGameTime.TotalSeconds;
if (MaxSpeed > 0)
{
Velocity = Vector3Extensions.Truncate(Velocity, MaxSpeed);
}
if (MinSpeed > 0)
{
Velocity = Vector3Extensions.Extend(Velocity, MinSpeed);
}
if (Velocity.LengthSquared() > 0.000000001f)
{
if (SmoothRotation)
{
Velocity = AdjustVelocityForSmoothRotation(gameTime);
}
VelocityForward = Vector3.Normalize(Velocity);
VelocityRight = Vector3.Normalize(Vector3.Cross(VelocityForward, VelocityUp));
VelocityUp = Vector3.Normalize(Vector3.Cross(VelocityRight, VelocityForward));
if (UsesBanking)
{
// the length of this global-upward-pointing vector controls the vehicle's
// tendency to right itself as it is rolled over from turning acceleration
var globalUp = new Vector3(0, 0.25f, 0);
Vector3 accelerationUp = _acceleration * 0.05f;
Vector3 bankUp = accelerationUp + globalUp;
bankUp.Z = 0f;
float smoothRate = (float)gameTime.ElapsedGameTime.TotalSeconds * 3;
Vector3 tempUp = VelocityUp;
MathExtensions.BlendIntoAccumulator(smoothRate, bankUp, ref tempUp);
VelocityUp = Vector3.Normalize(tempUp);
VelocityRight = Vector3.Normalize(Vector3.Cross(VelocityForward, VelocityUp));
}
}
Speed = Velocity.Length();
}