FAIRequestID AAIController::RequestPathAndMove(const FAIMoveRequest& MoveRequest, FPathFindingQuery& Query)
{
FAIRequestID RequestID;
UNavigationSystem* NavSys = UNavigationSystem::GetCurrent(GetWorld());
if (NavSys)
{
FPathFindingResult PathResult = NavSys->FindPathSync(Query);
if (PathResult.Result != ENavigationQueryResult::Error)
{
if (PathResult.IsSuccessful() && PathResult.Path.IsValid())
{
if (MoveRequest.IsUsingPathfinding())
{
if (MoveRequest.HasGoalActor())
{
PathResult.Path->SetGoalActorObservation(*MoveRequest.GetGoalActor(), 100.0f);
}
PathResult.Path->EnableRecalculationOnInvalidation(true);
}
RequestID = RequestMove(MoveRequest, PathResult.Path);
}
}
else
{
UE_VLOG(this, LogAINavigation, Error, TEXT("Trying to find path to %s resulted in Error"), *GetNameSafe(MoveRequest.GetGoalActor()));
}
}
return RequestID;
}
bool AAIController::PreparePathfinding(const FAIMoveRequest& MoveRequest, FPathFindingQuery& Query)
{
UNavigationSystem* NavSys = UNavigationSystem::GetCurrent(GetWorld());
if (NavSys)
{
ANavigationData* NavData = MoveRequest.IsUsingPathfinding() ?
NavSys->GetNavDataForProps(GetNavAgentPropertiesRef()) :
NavSys->GetAbstractNavData();
FVector GoalLocation = MoveRequest.GetGoalLocation();
if (MoveRequest.HasGoalActor())
{
const INavAgentInterface* NavGoal = Cast<const INavAgentInterface>(MoveRequest.GetGoalActor());
if (NavGoal)
{
const FVector Offset = NavGoal->GetMoveGoalOffset(this);
GoalLocation = FRotationTranslationMatrix(MoveRequest.GetGoalActor()->GetActorRotation(), NavGoal->GetNavAgentLocation()).TransformPosition(Offset);
}
else
{
GoalLocation = MoveRequest.GetGoalActor()->GetActorLocation();
}
}
Query = FPathFindingQuery(this, NavData, GetNavAgentLocation(), GoalLocation, UNavigationQueryFilter::GetQueryFilter(NavData, MoveRequest.GetNavigationFilter()));
Query.SetAllowPartialPaths(MoveRequest.IsUsingPartialPaths());
if (PathFollowingComponent)
{
PathFollowingComponent->OnPathfindingQuery(Query);
}
return true;
}
return false;
}
EPathFollowingRequestResult::Type AAIController::MoveTo(const FAIMoveRequest& MoveRequest)
{
SCOPE_CYCLE_COUNTER(STAT_MoveTo);
UE_VLOG(this, LogAINavigation, Log, TEXT("MoveTo: %s"), *MoveRequest.ToString());
EPathFollowingRequestResult::Type Result = EPathFollowingRequestResult::Failed;
bool bCanRequestMove = true;
bool bAlreadyAtGoal = false;
if (!MoveRequest.HasGoalActor())
{
if (MoveRequest.GetGoalLocation().ContainsNaN() || FAISystem::IsValidLocation(MoveRequest.GetGoalLocation()) == false)
{
UE_VLOG(this, LogAINavigation, Error, TEXT("AAIController::MoveTo: Destination is not valid! Goal(%s)"), TEXT_AI_LOCATION(MoveRequest.GetGoalLocation()));
bCanRequestMove = false;
}
// fail if projection to navigation is required but it failed
if (bCanRequestMove && MoveRequest.IsProjectingGoal())
{
UNavigationSystem* NavSys = UNavigationSystem::GetCurrent(GetWorld());
const FNavAgentProperties& AgentProps = GetNavAgentPropertiesRef();
FNavLocation ProjectedLocation;
if (NavSys && !NavSys->ProjectPointToNavigation(MoveRequest.GetGoalLocation(), ProjectedLocation, AgentProps.GetExtent(), &AgentProps))
{
UE_VLOG_LOCATION(this, LogAINavigation, Error, MoveRequest.GetGoalLocation(), 30.f, FLinearColor::Red, TEXT("AAIController::MoveTo failed to project destination location to navmesh"));
bCanRequestMove = false;
}
MoveRequest.UpdateGoalLocation(ProjectedLocation.Location);
}
bAlreadyAtGoal = bCanRequestMove && PathFollowingComponent &&
PathFollowingComponent->HasReached(MoveRequest.GetGoalLocation(), MoveRequest.GetAcceptanceRadius(), !MoveRequest.CanStopOnOverlap());
}
else
{
bAlreadyAtGoal = bCanRequestMove && PathFollowingComponent &&
PathFollowingComponent->HasReached(*MoveRequest.GetGoalActor(), MoveRequest.GetAcceptanceRadius(), !MoveRequest.CanStopOnOverlap());
}
if (bAlreadyAtGoal)
{
UE_VLOG(this, LogAINavigation, Log, TEXT("MoveToActor: already at goal!"));
// make sure previous move request gets aborted
PathFollowingComponent->AbortMove(TEXT("Aborting move due to new move request finishing with AlreadyAtGoal"), FAIRequestID::AnyRequest);
PathFollowingComponent->SetLastMoveAtGoal(true);
OnMoveCompleted(FAIRequestID::CurrentRequest, EPathFollowingResult::Success);
Result = EPathFollowingRequestResult::AlreadyAtGoal;
}
else if (bCanRequestMove)
{
FPathFindingQuery Query;
const bool bValidQuery = PreparePathfinding(MoveRequest, Query);
const FAIRequestID RequestID = bValidQuery ? RequestPathAndMove(MoveRequest, Query) : FAIRequestID::InvalidRequest;
if (RequestID.IsValid())
{
bAllowStrafe = MoveRequest.CanStrafe();
Result = EPathFollowingRequestResult::RequestSuccessful;
}
}
if (Result == EPathFollowingRequestResult::Failed)
{
if (PathFollowingComponent)
{
PathFollowingComponent->SetLastMoveAtGoal(false);
}
OnMoveCompleted(FAIRequestID::InvalidRequest, EPathFollowingResult::Invalid);
}
return Result;
}