private void FixedUpdate() { if (m_Target == null || !m_Driving) { // Car should not be moving, // use handbrake to stop m_CarController.Move(0, 0, -1f, 1f); } else { Vector3 fwd = transform.forward; if (m_Rigidbody.velocity.magnitude > m_CarController.MaxSpeed * 0.1f) { fwd = m_Rigidbody.velocity; } float desiredSpeed = m_CarController.MaxSpeed; // now it's time to decide if we should be slowing down... switch (m_BrakeCondition) { case BrakeCondition.TargetDirectionDifference: { // the car will brake according to the upcoming change in direction of the target. Useful for route-based AI, slowing for corners. // check out the angle of our target compared to the current direction of the car float approachingCornerAngle = Vector3.Angle(m_Target.forward, fwd); // also consider the current amount we're turning, multiplied up and then compared in the same way as an upcoming corner angle float spinningAngle = m_Rigidbody.angularVelocity.magnitude * m_CautiousAngularVelocityFactor; // if it's different to our current angle, we need to be cautious (i.e. slow down) a certain amount float cautiousnessRequired = Mathf.InverseLerp(0, m_CautiousMaxAngle, Mathf.Max(spinningAngle, approachingCornerAngle)); desiredSpeed = Mathf.Lerp(m_CarController.MaxSpeed, m_CarController.MaxSpeed * m_CautiousSpeedFactor, cautiousnessRequired); break; } case BrakeCondition.TargetDistance: { // the car will brake as it approaches its target, regardless of the target's direction. Useful if you want the car to // head for a stationary target and come to rest when it arrives there. // check out the distance to target Vector3 delta = m_Target.position - transform.position; float distanceCautiousFactor = Mathf.InverseLerp(m_CautiousMaxDistance, 0, delta.magnitude); // also consider the current amount we're turning, multiplied up and then compared in the same way as an upcoming corner angle float spinningAngle = m_Rigidbody.angularVelocity.magnitude * m_CautiousAngularVelocityFactor; // if it's different to our current angle, we need to be cautious (i.e. slow down) a certain amount float cautiousnessRequired = Mathf.Max(Mathf.InverseLerp(0, m_CautiousMaxAngle, spinningAngle), distanceCautiousFactor); desiredSpeed = Mathf.Lerp(m_CarController.MaxSpeed, m_CarController.MaxSpeed * m_CautiousSpeedFactor, cautiousnessRequired); break; } case BrakeCondition.NeverBrake: break; } // Evasive action due to collision with other cars: // our target position starts off as the 'real' target position Vector3 offsetTargetPos = m_Target.position; // if are we currently taking evasive action to prevent being stuck against another car: if (Time.time < m_AvoidOtherCarTime) { // slow down if necessary (if we were behind the other car when collision occured) desiredSpeed *= m_AvoidOtherCarSlowdown; // and veer towards the side of our path-to-target that is away from the other car offsetTargetPos += m_Target.right * m_AvoidPathOffset; } else { // no need for evasive action, we can just wander across the path-to-target in a random way, // which can help prevent AI from seeming too uniform and robotic in their driving offsetTargetPos += m_Target.right * (Mathf.PerlinNoise(Time.time * m_LateralWanderSpeed, m_RandomPerlin) * 2 - 1) * m_LateralWanderDistance; } // use different sensitivity depending on whether accelerating or braking: float accelBrakeSensitivity = (desiredSpeed < m_CarController.CurrentSpeed) ? m_BrakeSensitivity : m_AccelSensitivity; // decide the actual amount of accel/brake input to achieve desired speed. float accel = Mathf.Clamp((desiredSpeed - m_CarController.CurrentSpeed) * accelBrakeSensitivity, -1, 1); // add acceleration 'wander', which also prevents AI from seeming too uniform and robotic in their driving // i.e. increasing the accel wander amount can introduce jostling and bumps between AI cars in a race accel *= (1 - m_AccelWanderAmount) + (Mathf.PerlinNoise(Time.time * m_AccelWanderSpeed, m_RandomPerlin) * m_AccelWanderAmount); // calculate the local-relative position of the target, to steer towards Vector3 localTarget = transform.InverseTransformPoint(offsetTargetPos); // work out the local angle towards the target float targetAngle = Mathf.Atan2(localTarget.x, localTarget.z) * Mathf.Rad2Deg; // get the amount of steering needed to aim the car towards the target float steer = Mathf.Clamp(targetAngle * m_SteerSensitivity, -1, 1) * Mathf.Sign(m_CarController.CurrentSpeed); // feed input to the car controller. m_CarController.Move(steer, accel, accel, 0f); // if appropriate, stop driving when we're close enough to the target. if (m_StopWhenTargetReached && localTarget.magnitude < m_ReachTargetThreshold) { m_Driving = false; } } }
/// <summary> /// Update. /// </summary> void Update() { // LR float h = 0; if (handleMode) { h = Input.GetAxis("Handle"); } else if (keyboardMode) { h = CrossPlatformInputManager.GetAxis("Horizontal"); } // Straight float v = 0; if (pedalMode) { v = Input.GetAxis("Accel") * (-1f); v = (v + 1) * 0.5f; } else if (keyboardMode) { v = CrossPlatformInputManager.GetAxis("Vertical"); } // Brake float s = 0; if (pedalMode) { s = Input.GetAxis("Brake") * (-1f); s = (s + 1) * 0.5f; } else if (keyboardMode) { s = CrossPlatformInputManager.GetAxis("Space"); } // Back = backtrigger + straight bool b = CrossPlatformInputManager.GetButton("BackTrigger"); // Decide bool d = CrossPlatformInputManager.GetButtonUp("Decide"); // Reset Orientation if (CrossPlatformInputManager.GetButton("Reset")) { InputTracking.Recenter(); } if (s > 0) { m_Car.Move(h, 0, 0, s); // Stop } else { if (v == 0) { m_Car.Move(h, 0, 0, 0); // Do nothing } else { if (!b) { m_Car.Move(h, v, 0, 0); // Go } else { m_Car.Move(h, 0, (-1) * v, 0); // Back } } } if (d && push) { push = false; GameController.instance.ChangeGameScene(gameObject.name); StartCoroutine(PreventSuccessionPush()); } }