/// <summary>
/// Handle train physics update
///
/// </summary>
public void FixedUpdate()
{
//Call if we are the first in the train
if (previous == null)
{
if (isDerailed)
{
var r = GetComponent <Rigidbody>();
if (r != null)
{
_velocity = r.velocity.magnitude;
}
return;
}
float trainBrakeForce = 0;
float trainMass = 0;
float trainEngineForce = 0;
float trainDragForce = 0;
TrainController trailer = this;
while (trailer != null)
{
trainBrakeForce += trailer.GetBrakeForce();
trainMass += trailer.GetMass();
trainDragForce += trailer.GetDragForce();
TrainEngineController engine = trailer as TrainEngineController;
if (engine != null)
{
trainEngineForce += engine.GetTractiveForce();
}
trailer = trailer.next;
}
//Debug.Log("Train Mass " + trainMass + " kg");
// Add engine effort
Velocity += (trainEngineForce / trainMass) * Time.fixedDeltaTime;
// Calculate and subtract drag and braking
float brakeValue = -(float)trackVehicle.direction * (trainBrakeForce / trainMass) * Time.fixedDeltaTime;
trainDragForce *= -(float)trackVehicle.direction;
// Combine drag and brake into single value
float dragValue = brakeValue + (trainDragForce / trainMass) * Time.fixedDeltaTime;
// Stop train from reversing due to brake force...
if (trackVehicle.direction == Direction.Forward && Velocity + dragValue < 0.0f)
{
Velocity = 0.0f;
}
else
{
Velocity += dragValue;
}
//Set the velocity on the entire train
TrainController t = next;
while (t != null)
{
t.Velocity = Velocity;
t = t.next;
}
// Update positions
OnFixedUpdate();
}
}
