AEyeXActorBase* AEyeXPlayerController::FindByBoxedLineTrace(FHitResult& OutHit, const FSceneView* const View, const FVector2D& GazePoint,
const FCollisionObjectQueryParams& ObjectParams, const FCollisionQueryParams& TraceParams)
{
UWorld* World = GetWorld();
if (!World) return nullptr;
// Set up a box around the gaze point
FVector2D Corners[4];
GetBoxCorners(GazePoint, BoxSize * GetApproximatePixelsPerMillimeter(), Corners);
// First check center point
AEyeXActorBase* EyeXActor = nullptr;
FVector Start, End;
FEyeXUtils::GetStartAndEndOfLineTrace(View, MaxDistance, GazePoint, /*out*/ Start, /*out*/ End);
if (World->LineTraceSingleByObjectType(OutHit, Start, End, ObjectParams, TraceParams))
{
EyeXActor = Cast<AEyeXActorBase>(OutHit.GetActor());
}
else
{
// If center point missed we perform traces in a box around the gaze point
// and choose the closest EyeXActor hit by the traces
TArray<AEyeXActorBase*> EyeXActors;
for (int i = 0; i < 4; ++i)
{
FVector BoxStart, BoxEnd;
FEyeXUtils::GetStartAndEndOfLineTrace(View, MaxDistance, Corners[i], /*out*/ BoxStart, /*out*/ BoxEnd);
if (World->LineTraceSingleByObjectType(OutHit, BoxStart, BoxEnd, ObjectParams, TraceParams))
{
AEyeXActorBase* Actor = Cast<AEyeXActorBase>(OutHit.GetActor());
if (!Actor) continue;
EyeXActors.Add(Actor);
}
VisualizeHitTestPoint(bVisualizeDetection, World, BoxStart);
}
if (EyeXActors.Num() > 0)
{
FEyeXUtils::ActorDistanceComparer Comparer(PlayerCameraManager);
EyeXActors.Sort(Comparer);
EyeXActor = EyeXActors[0];
}
}
VisualizeHit(bVisualizeDetection, World, OutHit);
VisualizeGazePoint(bVisualizeDetection, World, Start);
return EyeXActor;
}
AEyeXActorBase* AEyeXPlayerController::FindByFrustumIntersection(FHitResult& OutHit, const FSceneView* const View, const FVector2D& GazePoint,
const FCollisionObjectQueryParams& ObjectParams, const FCollisionQueryParams& TraceParams)
{
UWorld* World = GetWorld();
if (!World) return nullptr;
FVector2D Corners[4];
GetBoxCorners(GazePoint, BoxSize * GetApproximatePixelsPerMillimeter(), Corners);
// First do a ray cast from the gaze point to determine if something is blocking.
// If we happen to find an AEyeXActorBase, we're done
FVector Start, End;
FEyeXUtils::GetStartAndEndOfLineTrace(View, MaxDistance, GazePoint, /*out*/ Start, /*out*/ End);
AEyeXActorBase* EyeXActor = nullptr;
if (World->LineTraceSingleByObjectType(OutHit, Start, End, ObjectParams, TraceParams))
{
EyeXActor = Cast<AEyeXActorBase>(OutHit.GetActor());
}
else
{
// Calculate frustum using the SceneView
FConvexVolume Frustum;
FEyeXMathHelpers::CalculateFrustum(Corners, View, Frustum);
// Check frustum intersection with EyeX Actors
TArray<AEyeXActorBase*> EyeXActors;
GetEyeXActorsSortedByDistance(EyeXActors);
for (AEyeXActorBase* Actor : EyeXActors)
{
if (FEyeXMathHelpers::IntersectsFrustum(OutHit, Actor, Frustum))
{
EyeXActor = Actor;
break;
}
}
}
VisualizeHit(bVisualizeDetection, World, OutHit);
VisualizeGazePoint(bVisualizeDetection, World, Start);
return EyeXActor;
}
AEyeXActorBase* AEyeXPlayerController::FindByLineTrace(FHitResult& OutHit, const FSceneView* const View, const FVector2D& GazePoint,
const FCollisionObjectQueryParams& ObjectParams, const FCollisionQueryParams& TraceParams)
{
UWorld* World = GetWorld();
if (!World) return nullptr;
AEyeXActorBase* EyeXActor = nullptr;
FVector Start, End;
FEyeXUtils::GetStartAndEndOfLineTrace(View, MaxDistance, GazePoint, /*out*/ Start, /*out*/ End);
if (World->LineTraceSingleByObjectType(OutHit, Start, End, ObjectParams, TraceParams))
{
EyeXActor = Cast<AEyeXActorBase>(OutHit.GetActor());
}
VisualizeHit(bVisualizeDetection, World, OutHit);
VisualizeGazePoint(bVisualizeDetection, World, Start);
return EyeXActor;
}
