private void InitializeLane(Street street, int lane, bool directionTowardsEnd)
{
float speedInLane = speedPerLaneMph[lane] * PhysicsHelper.milesPerHourToMetersPerSecond;
float safetyDistance = safetyDistanceTime * speedInLane;
var emptySections = new List <(float, float)>();
emptySections.Add((safetyDistance, street.length - safetyDistance));
int carsCount = Mathf.RoundToInt(density * street.length + Random.value);
if (density == 0)
{
carsCount = 0;
}
for (int i = 0; i < carsCount; i++)
{
// Stop if there are no more empty sections.
if (emptySections.Count == 0)
{
break;
}
// Place a car at a random position in a random empty section.
int emptySectionIndex = Random.Range(0, emptySections.Count);
(float start, float end) = emptySections[emptySectionIndex];
emptySections.RemoveAt(emptySectionIndex);
float position = Mathf.Lerp(start, end, Random.value);
AddCar(street, lane, position, directionTowardsEnd);
// Create two new empty sections, if they're long enough.
if (position - safetyDistance > start)
{
emptySections.Add((start, position - safetyDistance));
}
if (position + safetyDistance < end)
{
emptySections.Add((position + safetyDistance, end));
}
}
}
private void StopSimulatingStreet(Street street)
{
simulatedStreets.Remove(street);
foreach (CarTracker carTracker in trafficCarTrackers)
{
if (carTracker.street == street)
{
Destroy(carTracker.gameObject);
carTrackersToBeRemoved.Add(carTracker);
}
}
foreach (CarTracker carTracker in carTrackersToBeRemoved)
{
trafficCarTrackers.Remove(carTracker);
}
carTrackersToBeRemoved.Clear();
}
private void StartSimulatingStreet(Street street)
{
simulatedStreets.Add(street);
// Initialize traffic on this street.
if (street.isOneWay)
{
for (int lane = 1; lane <= street.lanesCount; lane++)
{
InitializeLane(street, lane, !street.oneWayDirectionGoesToStart);
}
}
else
{
for (int lane = 1; lane <= street.lanesCount / 2; lane++)
{
InitializeLane(street, lane, true);
InitializeLane(street, lane, false);
}
}
}
public Vector2 GetSize()
{
int widthLanesCount = 2;
int heightLanesCount = 2;
Street northSouthStreet = northStreet ?? southStreet;
Street eastWestStreet = eastStreet ?? westStreet;
if (northSouthStreet != null)
{
widthLanesCount = northSouthStreet.lanesCount;
}
if (eastWestStreet != null)
{
heightLanesCount = eastWestStreet.lanesCount;
}
float width = 2 * City.sidewalkWidth + widthLanesCount * City.laneWidth;
float height = 2 * City.sidewalkWidth + heightLanesCount * City.laneWidth;
return(new Vector2(width, height));
}
private void AddCar(Street street, int lane, float positionAlongStreet, bool directionTowardsEnd)
{
Vector3 positionStreet;
Vector3 directionStreet;
float sidePosition = City.sidewalkWidth + (lane - 0.5f) * City.laneWidth;
if (directionTowardsEnd)
{
positionStreet = new Vector3(sidePosition, 0, positionAlongStreet);
directionStreet = Vector3.forward;
}
else
{
positionStreet = new Vector3(street.width - sidePosition, 0, street.length - positionAlongStreet);
directionStreet = Vector3.back;
}
Vector3 position = street.transform.TransformPoint(positionStreet);
Vector3 direction = street.transform.TransformDirection(directionStreet);
Quaternion rotation = Quaternion.LookRotation(direction, Vector3.up);
GameObject car = Instantiate(trafficCarPrefab, position, rotation, carTrafficRoot);
CarTracker carTracker = car.GetComponent <CarTracker>();
carTracker.city = city;
trafficCarTrackers.Add(carTracker);
CarAudio carAudio = car.GetComponent <CarAudio>();
carAudio.gameMode = gameMode;
float initialSpeed = speedPerLaneMph[lane] * PhysicsHelper.milesPerHourToMetersPerSecond;
car.GetComponent <Car>().InitializeSpeed(initialSpeed);
}
protected Street AddStreet(Vector2Int fromBlock, Vector2Int toBlock, int lanesCount, bool isOneWay = false)
{
// Assert lane restrictions.
if (lanesCount != 2 && lanesCount != 4 && lanesCount != 6)
{
Debug.LogError($"Street with invalid lanes count ({lanesCount}) added.");
return(null);
}
if (isOneWay && lanesCount != 2)
{
Debug.LogError($"One way streets can only have 2 lanes.");
return(null);
}
// Create the street.
var street = new Street
{
lanesCount = lanesCount,
isOneWay = isOneWay
};
streets.Add(street);
// Determine one way direction and set start/end locations (converted from blocks to meters).
Vector2Int start = fromBlock * 100;
Vector2Int end = toBlock * 100;
void FlipDirection()
{
(start, end) = (end, start);
if (isOneWay)
{
street.oneWayDirectionGoesToStart = true;
}
}
if (fromBlock.x == toBlock.x)
{
// This is a N-S road. Flip direction if necessary.
if (fromBlock.y > toBlock.y)
{
FlipDirection();
}
}
else
{
// This is an E-W road. Flip direction if necessary.
if (fromBlock.x > toBlock.x)
{
FlipDirection();
}
}
// Create intersections if necessary and assign them to the street.
Intersection CreateIntersection(Vector2Int location)
{
var intersection = new Intersection {
position = location
};
intersections[location] = intersection;
return(intersection);
}
street.startIntersection = intersections.ContainsKey(start) ? intersections[start] : CreateIntersection(start);
street.endIntersection = intersections.ContainsKey(end) ? intersections[end] : CreateIntersection(end);
// Assign the streets to the intersections.
if (fromBlock.x == toBlock.x)
{
// This is a N-S road.
street.startIntersection.northStreet = street;
street.endIntersection.southStreet = street;
}
else
{
// This is an E-W road.
street.startIntersection.eastStreet = street;
street.endIntersection.westStreet = street;
}
return(street);
}
public int GetLanesCountInDrection(CardinalDirection direction)
{
Street street = GetStreetInOrientation(DirectionHelpers.cardinalDirectionStreetOrientations[direction]);
return(street != null ? street.lanesCount : 2);
}
public float GetStreetWidthInDrection(CardinalDirection direction)
{
Street street = GetStreetInOrientation(DirectionHelpers.cardinalDirectionStreetOrientations[direction]);
return(street != null ? street.width : (City.sidewalkWidth + City.laneWidth) * 2);
}
public bool HasStopLineForStreet(Street street)
{
if (isFourWayIntersection)
{
// Intersections with traffic lights (4-6 lanes) always have stop lines.
if (hasTrafficLights)
{
return(true);
}
// When two 4-lane streets cross, east-west has priority;
Street northSouthStreet = northStreet ?? southStreet;
Street eastWestStreet = eastStreet ?? westStreet;
if (northSouthStreet.lanesCount == 4 && eastWestStreet.lanesCount == 4)
{
return(street == northStreet || street == southStreet);
}
// When two one-way streets cross, east-west has priority;
if (northSouthStreet.isOneWay && eastWestStreet.isOneWay)
{
return(street == northStreet || street == southStreet);
}
// One-way streets crossing non-one way streets always have stop signs if entering the intersection.
if (street.isOneWay)
{
bool streetIsEnteringIfGointToStart = street == northStreet || street == eastStreet;
return(streetIsEnteringIfGointToStart && street.oneWayDirectionGoesToStart);
}
// Street with 2 lanes always has a stop sign except if the other is a one-way street.
if (street.lanesCount == 2)
{
if (street == northStreet || street == southStreet)
{
return(!eastWestStreet.isOneWay);
}
else
{
return(!northSouthStreet.isOneWay);
}
}
// This must be a higher priority road so it has no stop sign.
return(false);
}
else if (isTIntersection)
{
bool hasStopSign = false;
// Street that doesn't continue has the stop sign.
if (street == northStreet && southStreet == null)
{
hasStopSign = true;
}
if (street == southStreet && northStreet == null)
{
hasStopSign = true;
}
if (street == eastStreet && westStreet == null)
{
hasStopSign = true;
}
if (street == westStreet && eastStreet == null)
{
hasStopSign = true;
}
if (hasStopSign)
{
// Make sure this is not a one-way street that is exiting the intersection.
if (street.isOneWay)
{
bool streetIsEnteringIfGointToStart = street == northStreet || street == eastStreet;
return(streetIsEnteringIfGointToStart && street.oneWayDirectionGoesToStart);
}
else
{
return(true);
}
}
return(false);
}
else
{
return(false);
}
}
public void Generate(City city)
{
// Create the intersection game object as a child of Intersections.
gameObject = new GameObject($"Intersection ({position.x}, {position.y})");
gameObject.transform.parent = city.transform.Find("Intersections");
// Position in the game world.
Vector2 size = GetSize();
gameObject.transform.localPosition = new Vector3
{
x = position.x - size.x / 2,
z = position.y - size.y / 2
};
// Set bounds.
bounds = new Bounds
{
center = new Vector3(position.x, City.boundsBaseY + City.boundsHeight / 2, position.y),
size = new Vector3(size.x, City.boundsHeight, size.y)
};
// Place prefabs.
StreetPieces streetPieces = city.streetPieces;
GameObject road = streetPieces.Instantiate(streetPieces.roadPrefab, gameObject);
road.transform.localScale = new Vector3(size.x, 1, size.y);
// Place sidewalk corners or sides.
void CreateCorner(float rotation, float x, float z)
{
GameObject corner = streetPieces.Instantiate(streetPieces.sidewalkCornerPrefab, gameObject);
corner.transform.localScale = new Vector3(City.sidewalkWidth, 1, City.sidewalkWidth);
corner.transform.localRotation = Quaternion.Euler(0, rotation, 0);
corner.transform.localPosition = new Vector3 {
x = x, z = z
};
}
if (southStreet != null && westStreet != null)
{
CreateCorner(0, 0, 0);
}
if (northStreet != null && westStreet != null)
{
CreateCorner(90, 0, size.y);
}
if (northStreet != null && eastStreet != null)
{
CreateCorner(180, size.x, size.y);
}
if (southStreet != null && eastStreet != null)
{
CreateCorner(270, size.x, 0);
}
if (northStreet == null)
{
GameObject sidewalk = streetPieces.Instantiate(streetPieces.sidewalkPrefab, gameObject);
sidewalk.transform.localScale = new Vector3(size.x, 1, City.sidewalkWidth);
sidewalk.transform.localPosition = new Vector3 {
z = size.y - City.sidewalkWidth
};
}
if (southStreet == null)
{
GameObject sidewalk = streetPieces.Instantiate(streetPieces.sidewalkPrefab, gameObject);
sidewalk.transform.localScale = new Vector3(size.x, 1, City.sidewalkWidth);
}
if (eastStreet == null)
{
GameObject sidewalk = streetPieces.Instantiate(streetPieces.sidewalkPrefab, gameObject);
sidewalk.transform.localScale = new Vector3(City.sidewalkWidth, 1, size.y);
sidewalk.transform.localPosition = new Vector3 {
x = size.x - City.sidewalkWidth
};
}
if (westStreet == null)
{
GameObject sidewalk = streetPieces.Instantiate(streetPieces.sidewalkPrefab, gameObject);
sidewalk.transform.localScale = new Vector3(City.sidewalkWidth, 1, size.y);
}
// Place lines if one street has priority.
bool hasLinesNorthSouth = false;
bool hasLinesEastWest = false;
Street northSouthStreet = northStreet ?? southStreet;
Street eastWestStreet = eastStreet ?? westStreet;
if (isFourWayIntersection)
{
// 4-way intersections have lines where there are no stop signs on both ends.
hasLinesEastWest = !HasStopLineForStreet(eastStreet) && !HasStopLineForStreet(westStreet);
hasLinesNorthSouth = !HasStopLineForStreet(northStreet) && !HasStopLineForStreet(southStreet);
}
else if (isTIntersection)
{
// T intersections always have priority on the street that doesn't end.
hasLinesEastWest = northStreet == null || southStreet == null;
hasLinesNorthSouth = eastStreet == null || westStreet == null;
}
if (hasLinesNorthSouth)
{
var brokenLineXCoordinates = new List <float>();
if (northSouthStreet.isOneWay)
{
brokenLineXCoordinates.Add(size.x / 2);
}
else
{
GameObject centerLine = streetPieces.Instantiate(streetPieces.solidLinePrefab, gameObject);
centerLine.transform.localScale = new Vector3(1, 1, size.y);
centerLine.transform.localPosition = new Vector3 {
x = size.x / 2
};
}
for (int i = 2; i < northSouthStreet.lanesCount; i += 2)
{
float sideOffset = City.sidewalkWidth + City.laneWidth * (i / 2);
brokenLineXCoordinates.Add(sideOffset);
brokenLineXCoordinates.Add(size.x - sideOffset);
}
foreach (float xCoordinate in brokenLineXCoordinates)
{
GameObject laneLine = streetPieces.Instantiate(streetPieces.brokenLinePrefab, gameObject);
laneLine.transform.localScale = new Vector3(1, 1, size.y);
laneLine.transform.localPosition = new Vector3 {
x = xCoordinate
};
StreetPieces.ChangeBrokenLineTiling(laneLine);
}
}
if (hasLinesEastWest)
{
var brokenLineZCoordinates = new List <float>();
if (eastWestStreet.isOneWay)
{
brokenLineZCoordinates.Add(size.y / 2);
}
else
{
GameObject centerLine = streetPieces.Instantiate(streetPieces.solidLinePrefab, gameObject);
centerLine.transform.localScale = new Vector3(1, 1, size.x);
centerLine.transform.localRotation = Quaternion.Euler(0, 90, 0);
centerLine.transform.localPosition = new Vector3 {
z = size.y / 2
};
}
for (int i = 2; i < eastWestStreet.lanesCount; i += 2)
{
float sideOffset = City.sidewalkWidth + City.laneWidth * (i / 2);
brokenLineZCoordinates.Add(sideOffset);
brokenLineZCoordinates.Add(size.y - sideOffset);
}
foreach (float zCoordinate in brokenLineZCoordinates)
{
GameObject laneLine = streetPieces.Instantiate(streetPieces.brokenLinePrefab, gameObject);
laneLine.transform.localScale = new Vector3(1, 1, size.x);
laneLine.transform.localRotation = Quaternion.Euler(0, 90, 0);
laneLine.transform.localPosition = new Vector3 {
z = zCoordinate
};
StreetPieces.ChangeBrokenLineTiling(laneLine);
}
}
// Place buildings in 4 corners.
void CreateBuilding(float x, float z, float width = City.minBuildingLength, float depth = City.minBuildingLength)
{
GameObject building = streetPieces.Instantiate(streetPieces.buildingPrefab, gameObject);
building.transform.localScale = new Vector3(width, City.buildingHeights[1], depth);
building.transform.localPosition = new Vector3(x, 0, z);
}
CreateBuilding(-City.minBuildingLength, -City.minBuildingLength);
CreateBuilding(-City.minBuildingLength, size.y);
CreateBuilding(size.x, -City.minBuildingLength);
CreateBuilding(size.x, size.y);
// Place buildings in directions where there is no street.
if (northStreet == null)
{
CreateBuilding(0, size.y, width: size.x);
}
if (southStreet == null)
{
CreateBuilding(0, -City.minBuildingLength, width: size.x);
}
if (eastStreet == null)
{
CreateBuilding(size.x, 0, depth: size.y);
}
if (westStreet == null)
{
CreateBuilding(-City.minBuildingLength, 0, depth: size.y);
}
}
private void UpdateNextIntersectionDirection(Driver.Sensors sensors)
{
// We need to be on a street and not having been on a street previously (as we would have already decided where to go).
Street currentStreet = sensors.carTracker.street;
if (currentStreet != null && previousStreet == null)
{
// Determine where to go at the end of this street.
CardinalDirection currentDirection = sensors.carTracker.streetCardinalDirection;
Intersection targetIntersection = GetTargetIntersection(sensors);
// See where we might want to go.
var potentialDirections = new List <CardinalDirection>();
CardinalDirection oppositeDirection = DirectionHelpers.GetOppositeDirection(currentDirection);
foreach (CardinalDirection direction in DirectionHelpers.cardinalDirections)
{
// Don't try to go backwards by default.
if (direction == oppositeDirection)
{
continue;
}
// Direction is possible if the intersection has this street.
Street street = targetIntersection.GetStreetInDirection(direction);
if (street != null)
{
// Make sure we're not entering into a one-way street from the wrong direction.
if (street.isOneWay == false || !targetIntersection.HasStopLineForStreet(street))
{
potentialDirections.Add(direction);
}
}
}
// Only if no options were there, go back.
if (potentialDirections.Count == 0)
{
potentialDirections.Add(oppositeDirection);
}
// Choose a random option.
int randomIndex = UnityEngine.Random.Range(0, potentialDirections.Count);
// Determine exiting values.
nextIntersectionExitingCardinalDirection = potentialDirections[randomIndex];
nextIntersectionExitingDirection = DirectionHelpers.cardinalDirectionVectors[nextIntersectionExitingCardinalDirection];
nextIntersectionExitingStreet = targetIntersection.GetStreetInDirection(nextIntersectionExitingCardinalDirection);
// Figure out which lane to go into.
float angleToTarget = Vector3.SignedAngle(sensors.carTracker.streetDirection, DirectionHelpers.cardinalDirectionVectors[nextIntersectionExitingCardinalDirection], Vector3.up);
Street nextStreet = targetIntersection.GetStreetInDirection(nextIntersectionExitingCardinalDirection);
if (nextIntersectionExitingCardinalDirection == currentDirection)
{
// Be in the middle (or right) lane when going straight.
nextIntersectionExitingLane = nextStreet.validLanesCount / 2 + 1;
nextIntersectionTurningIntent = Driver.TurningIntent.Straight;
}
else if (nextIntersectionExitingCardinalDirection == oppositeDirection)
{
// Turn into leftmost lane for U-turns.
nextIntersectionExitingLane = 1;
nextIntersectionTurningIntent = Driver.TurningIntent.UTurn;
}
else if (angleToTarget < 0)
{
// Be in leftmost lane after upcoming left turns.
nextIntersectionExitingLane = 1;
nextIntersectionTurningIntent = Driver.TurningIntent.Left;
}
else
{
// Be in the rightmost lane after upcoming right turns.
nextIntersectionExitingLane = nextStreet.validLanesCount;
nextIntersectionTurningIntent = Driver.TurningIntent.Right;
}
nextIntersectionExitingPoint = nextIntersectionExitingStreet.GetCenterOfLanePosition(nextIntersectionExitingLane, 0, nextIntersectionExitingCardinalDirection);
// Store entering values.
nextIntersectionEnteringCardinalDirection = currentDirection;
nextIntersectionEnteringDirection = DirectionHelpers.cardinalDirectionVectors[currentDirection];
nextIntersectionEnteringStreet = currentStreet;
// Figure out which lane to enter the intersection from.
switch (nextIntersectionTurningIntent)
{
case Driver.TurningIntent.Straight:
// Be in the middle (or right) lane when going straight.
nextIntersectionEnteringLane = currentStreet.validLanesCount / 2 + 1;
break;
case Driver.TurningIntent.Left:
// Be in leftmost lane for upcoming left turns.
nextIntersectionEnteringLane = 1;
break;
case Driver.TurningIntent.Right:
// Be in the rightmost lane for upcoming right turns.
nextIntersectionEnteringLane = currentStreet.validLanesCount;
break;
case Driver.TurningIntent.UTurn:
// Turn from the sidewalk for U-turns.
nextIntersectionEnteringLane = 0;
break;
}
nextIntersectionEnteringPoint = nextIntersectionEnteringStreet.GetCenterOfLanePosition(nextIntersectionEnteringLane, nextIntersectionEnteringStreet.length, nextIntersectionEnteringCardinalDirection);
}
// Update street.
previousStreet = currentStreet;
}
private void UpdateTargetLaneAndDirection(Driver.Sensors sensors, Driver.Actuators actuators)
{
Street currentStreet = sensors.carTracker.street;
Intersection currentIntersection = sensors.carTracker.intersection;
float distanceToIntersection = GetDistanceToTargetIntersection(sensors);
float turningTargetDistance = Math.Max(turningTargetMinimumDistance, turningTargetTime * sensors.car.speed);
// See if we should start performing a turn.
bool performingTurn = false;
switch (nextIntersectionTurningIntent)
{
case Driver.TurningIntent.Left:
case Driver.TurningIntent.Right:
// When turning left and right, start turning when close enough to the intersection.
performingTurn = currentIntersection != null || distanceToIntersection < turningTargetDistance;
break;
case Driver.TurningIntent.UTurn:
// When performing a U-turn, start in the intersection.
performingTurn = currentIntersection != null;
break;
}
if (performingTurn)
{
DrawDebugIntersectionArc();
switch (nextIntersectionTurningIntent)
{
case Driver.TurningIntent.Left:
case Driver.TurningIntent.Right:
// For right turns, follow an arc.
float xEnter = Vector3.Dot(nextIntersectionExitingDirection, nextIntersectionEnteringPoint);
float xExit = Vector3.Dot(nextIntersectionExitingDirection, nextIntersectionExitingPoint);
float xDelta = xExit - xEnter;
float zEnter = Vector3.Dot(nextIntersectionEnteringDirection, nextIntersectionEnteringPoint);
float zExit = Vector3.Dot(nextIntersectionEnteringDirection, nextIntersectionExitingPoint);
float zDelta = zExit - zEnter;
// Place a target in front of the car.
Vector3 carPosition = sensors.car.transform.position;
Vector3 target = carPosition + sensors.car.transform.forward * turningTargetDistance;
Debug.DrawLine(carPosition + Vector3.up * 2, target + Vector3.up * 2, Color.magenta);
float xTarget = Vector3.Dot(nextIntersectionExitingDirection, target) - xEnter;
float zTarget = Vector3.Dot(nextIntersectionEnteringDirection, target) - zEnter;
// Move target onto the arc.
float zTargetFraction = zTarget / zDelta;
float xTargetFraction = xTarget / xDelta;
float angle = Mathf.Atan2(zTargetFraction, 1 - xTargetFraction);
xTargetFraction = 1 - Mathf.Cos(angle);
zTargetFraction = xTargetFraction > 1 ? 1 : Mathf.Sin(angle);
xTarget = xTargetFraction * xDelta;
zTarget = zTargetFraction * zDelta;
target = nextIntersectionEnteringPoint + nextIntersectionExitingDirection * xTarget + nextIntersectionEnteringDirection * zTarget;
// Direct the car towards the adjusted target.
actuators.targetDirection = (target - carPosition).normalized;
Debug.DrawLine(carPosition + Vector3.up * 2, target + Vector3.up * 2, Color.blue);
break;
case Driver.TurningIntent.UTurn:
// For U-turns, start by turning right as tight as possible.
if (Vector3.Angle(nextIntersectionEnteringDirection, sensors.car.transform.forward) < 45)
{
actuators.targetDirection = Quaternion.AngleAxis(90, Vector3.up) * nextIntersectionEnteringDirection;
}
else
{
actuators.targetDirection = nextIntersectionExitingDirection;
}
break;
}
actuators.targetLane = nextIntersectionExitingLane;
}
else if (currentStreet != null)
{
// If we're on a street, go to correct turning lane.
float angleToTarget = Vector3.SignedAngle(sensors.carTracker.streetDirection, DirectionHelpers.cardinalDirectionVectors[nextIntersectionExitingCardinalDirection], Vector3.up);
CardinalDirection currentDirection = sensors.carTracker.streetCardinalDirection;
CardinalDirection oppositeDirection = DirectionHelpers.GetOppositeDirection(currentDirection);
int currentLane = sensors.carTracker.currentLane;
int desiredLane = nextIntersectionEnteringLane;
if (desiredLane != currentLane)
{
// Start moving to the desired lane when close enough to the intersection.
int laneDifference = desiredLane - currentLane;
float minimumDistanceToIntersection = sensors.driverProfile.distanceForChangingLane * Mathf.Abs(laneDifference);
// For U-turns from the sidewalk, only drive onto the sidewalk in the last meters.
if (nextIntersectionTurningIntent == Driver.TurningIntent.UTurn && currentLane == 1)
{
minimumDistanceToIntersection = uTurnDriveToSidewalkDistance;
}
if (distanceToIntersection < minimumDistanceToIntersection)
{
actuators.turningIntent = nextIntersectionTurningIntent;
// Make sure the neighbor lane is free in the safe distance region before and after the car.
int neighborLane = currentLane + Math.Sign(laneDifference);
float safeDistance = CalculateSafeDistance(sensors);
Vector3 streetDirection = sensors.carTracker.streetDirection;
float carLength = sensors.car.bounds.size.z;
Vector3 origin = sensors.carTracker.GetCenterOfLanePosition(neighborLane) + (safeDistance + carLength / 2) * streetDirection + Vector3.up * sensors.car.bounds.extents.y;
float checkDistance = 2 * safeDistance + carLength;
if (!Physics.Raycast(origin, -streetDirection, checkDistance))
{
actuators.targetLane = desiredLane;
Debug.DrawRay(origin, -streetDirection * checkDistance, Color.green, 1);
}
else
{
Debug.DrawRay(origin, -streetDirection * checkDistance, Color.red);
}
}
}
actuators.targetDirection = sensors.carTracker.streetDirection;
}
}
private void Update()
{
// See if game camera is in the same location as before.
CarTracker focusedCarTracker = gameMode.currentCamera.trackedCar;
if (focusedCarTracker.street != null && focusedCarTracker.street != focusedStreet || focusedCarTracker.intersection != null && focusedCarTracker.intersection != focusedIntersection)
{
// We have moved to a different street or intersection so we need to recalculate the simulated streets and intersections.
focusedIntersection = focusedCarTracker.intersection;
focusedStreet = focusedCarTracker.street;
void AddIntersectionVicinity(Intersection intersection, int distance)
{
if (distance == 0)
{
return;
}
newSimulatedIntersections.Add(intersection);
if (intersection.northStreet != null)
{
AddStreetVicinity(intersection.northStreet, distance);
}
if (intersection.southStreet != null)
{
AddStreetVicinity(intersection.southStreet, distance);
}
if (intersection.eastStreet != null)
{
AddStreetVicinity(intersection.eastStreet, distance);
}
if (intersection.westStreet != null)
{
AddStreetVicinity(intersection.westStreet, distance);
}
}
void AddStreetVicinity(Street street, int distance)
{
if (distance == 0)
{
return;
}
newSimulatedStreets.Add(street);
AddIntersectionVicinity(street.startIntersection, distance - 1);
AddIntersectionVicinity(street.endIntersection, distance - 1);
}
if (focusedStreet != null)
{
AddStreetVicinity(focusedStreet, 3);
}
else
{
AddIntersectionVicinity(focusedIntersection, 2);
}
// Update simulated streets.
foreach (Street street in simulatedStreets)
{
if (!newSimulatedStreets.Contains(street))
{
// This street is no longer being simulated, so we can remove it, including all the cars left in it.
streetsToBeStopped.Add(street);
}
}
foreach (Street street in streetsToBeStopped)
{
StopSimulatingStreet(street);
}
streetsToBeStopped.Clear();
foreach (Street street in newSimulatedStreets)
{
if (!simulatedStreets.Contains(street))
{
// This street isn't being simulated, so start doing it.
StartSimulatingStreet(street);
}
}
newSimulatedStreets.Clear();
// Update simulated intersections.
foreach (Intersection intersection in simulatedIntersections)
{
if (!newSimulatedIntersections.Contains(intersection))
{
// This street is no longer being simulated, so we can remove it, including all the cars left in it.
intersectionsToBeStopped.Add(intersection);
}
}
foreach (Intersection intersection in intersectionsToBeStopped)
{
StopSimulatingIntersection(intersection);
}
intersectionsToBeStopped.Clear();
foreach (Intersection intersection in newSimulatedIntersections)
{
if (!simulatedIntersections.Contains(intersection))
{
// This street isn't being simulated, so start doing it.
StartSimulatingIntersection(intersection);
}
}
newSimulatedIntersections.Clear();
}
// Remove cars that left the simulation area.
foreach (CarTracker carTracker in trafficCarTrackers)
{
if (carTracker.street != null && !simulatedStreets.Contains(carTracker.street) ||
carTracker.intersection != null && !simulatedIntersections.Contains(carTracker.intersection))
{
Destroy(carTracker.gameObject);
carTrackersToBeRemoved.Add(carTracker);
}
}
foreach (CarTracker carTracker in carTrackersToBeRemoved)
{
trafficCarTrackers.Remove(carTracker);
}
carTrackersToBeRemoved.Clear();
// Add cars at the edges of the simulation areas.
foreach (Street street in simulatedStreets)
{
if (street.isOneWay)
{
if (street.oneWayDirectionGoesToStart)
{
if (!simulatedIntersections.Contains(street.endIntersection))
{
SimulateStreetEntrance(street, false);
}
}
else
{
if (!simulatedIntersections.Contains(street.startIntersection))
{
SimulateStreetEntrance(street, true);
}
}
}
else
{
if (!simulatedIntersections.Contains(street.endIntersection))
{
SimulateStreetEntrance(street, false);
}
if (!simulatedIntersections.Contains(street.startIntersection))
{
SimulateStreetEntrance(street, true);
}
}
}
}