protected override void OnUpdate()
{
var race = GetSingleton <Race>();
if (!race.IsInProgress())
{
return;
}
var updateCarLapSystem = EntityManager.World.GetExistingSystem <UpdateCarLapProgress>();
var controlPoints = updateCarLapSystem.ControlPoints;
Dependency = Entities.WithAll <Car>().ForEach((ref Car car, ref CarInputs inputs, in AI opponent,
in LocalToWorld localToWorld, in LapProgress lapProgress,
in Translation translation) =>
{
var controlPointIndex = lapProgress.CurrentControlPoint;
var controlPointProgress = lapProgress.CurrentControlPointProgress;
var firstControlPointIndex = controlPointIndex == 0 ? controlPoints.Length - 1 : controlPointIndex - 1;
var closestPoint = SplineUtils.GetPoint(controlPoints, firstControlPointIndex, controlPointProgress);
var tangent = SplineUtils.GetTangent(controlPoints, firstControlPointIndex, controlPointProgress);
var targetPoint = closestPoint + tangent * 4f +
math.cross(tangent, new float3(0f, 1f, 0f)) * opponent.NormalDistanceFromTrack;
var current = new float2(translation.Value.x, translation.Value.z);
var target = new float2(targetPoint.x, targetPoint.z);
var wantedDirection = target - current;
var currentDirection = new float2(localToWorld.Forward.x, localToWorld.Forward.z);
var angleCurrentDirection = math.atan2(currentDirection.y, currentDirection.x);
angleCurrentDirection = math.degrees(angleCurrentDirection);
var angleWantedDirection = math.atan2(wantedDirection.y, wantedDirection.x);
angleWantedDirection = math.degrees(angleWantedDirection);
var angleDiff = angleWantedDirection - angleCurrentDirection;
// Steer the car to follow the curve of the track
if (angleDiff < 180f && angleDiff > -180f)
{
inputs.HorizontalAxis = angleDiff > 0f ? -1f : 1f;
}
else
{
inputs.HorizontalAxis = angleDiff > 0f ? 1f : -1f;
}
// AI cars always accelerate to full speed
inputs.AccelerationAxis = 1f;
}).WithReadOnly(controlPoints).ScheduleParallel(Dependency);
void DrawCurve(float3[] controlPoints)
{
var lineCount = 50;
for (int i = 1; i <= lineCount; i++)
{
var previousRatio = (i - 1) / (float)lineCount;
var ratio = i / (float)lineCount;
using (NativeArray <float3> points = new NativeArray <float3>(controlPoints, Allocator.Temp))
{
var previousPosition = SplineUtils.GetPoint(points, 0, previousRatio);
var currentPosition = SplineUtils.GetPoint(points, 0, ratio);
Gizmos.DrawLine(previousPosition, currentPosition);
}
}
}
protected override JobHandle OnUpdate(JobHandle inputDeps)
{
var race = GetSingleton <Race>();
if (!race.IsRaceStarted)
{
return(inputDeps);
}
var updateCarLapSystem = World.GetExistingSystem <UpdateCarLapProgress>();
if (!updateCarLapSystem.AreControlPointsInitialized)
{
return(inputDeps);
}
var controlPoints = updateCarLapSystem.ControlPoints;
return(Entities.ForEach((ref LapProgress lapProgress, ref Translation translation) =>
{
var controlPointIndex = lapProgress.CurrentControlPoint;
var controlPointProgress = lapProgress.CurrentControlPointProgress;
var firstControlPointIndex = controlPointIndex == 0 ? controlPoints.Length - 1 : controlPointIndex - 1;
var closestPoint = SplineUtils.GetPoint(controlPoints, firstControlPointIndex, controlPointProgress);
var distanceFromCenterOfTrackSq = math.distancesq(closestPoint, translation.Value);
var maxDistanceFromCenterOfRoad = 6.4f;
if (distanceFromCenterOfTrackSq > maxDistanceFromCenterOfRoad * maxDistanceFromCenterOfRoad)
{
var clampedPosition = closestPoint +
math.normalize(translation.Value - closestPoint) *
maxDistanceFromCenterOfRoad;
translation.Value.xz = clampedPosition.xz;
}
}).WithReadOnly(controlPoints).Schedule(inputDeps));
}