bool AAIController::BuildPathfindingQuery(const FAIMoveRequest& MoveRequest, FPathFindingQuery& Query) const
{
bool bResult = false;
UNavigationSystem* NavSys = UNavigationSystem::GetCurrent(GetWorld());
const ANavigationData* NavData = (NavSys == nullptr) ? nullptr :
MoveRequest.IsUsingPathfinding() ? NavSys->GetNavDataForProps(GetNavAgentPropertiesRef()) :
NavSys->GetAbstractNavData();
if (NavData)
{
FVector GoalLocation = MoveRequest.GetGoalLocation();
if (MoveRequest.IsMoveToActorRequest())
{
const INavAgentInterface* NavGoal = Cast<const INavAgentInterface>(MoveRequest.GetGoalActor());
if (NavGoal)
{
const FVector Offset = NavGoal->GetMoveGoalOffset(this);
GoalLocation = FQuatRotationTranslationMatrix(MoveRequest.GetGoalActor()->GetActorQuat(), NavGoal->GetNavAgentLocation()).TransformPosition(Offset);
}
else
{
GoalLocation = MoveRequest.GetGoalActor()->GetActorLocation();
}
}
FSharedConstNavQueryFilter NavFilter = UNavigationQueryFilter::GetQueryFilter(*NavData, this, MoveRequest.GetNavigationFilter());
Query = FPathFindingQuery(*this, *NavData, GetNavAgentLocation(), GoalLocation, NavFilter);
Query.SetAllowPartialPaths(MoveRequest.IsUsingPartialPaths());
if (PathFollowingComponent)
{
PathFollowingComponent->OnPathfindingQuery(Query);
}
bResult = true;
}
else
{
UE_VLOG(this, LogAINavigation, Warning, TEXT("Unable to find NavigationData instance while calling AAIController::BuildPathfindingQuery"));
}
return bResult;
}
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;
}
FPathFollowingRequestResult AAIController::MoveTo(const FAIMoveRequest& MoveRequest, FNavPathSharedPtr* OutPath)
{
// both MoveToActor and MoveToLocation can be called from blueprints/script and should keep only single movement request at the same time.
// this function is entry point of all movement mechanics - do NOT abort in here, since movement may be handled by AITasks, which support stacking
SCOPE_CYCLE_COUNTER(STAT_MoveTo);
UE_VLOG(this, LogAINavigation, Log, TEXT("MoveTo: %s"), *MoveRequest.ToString());
FPathFollowingRequestResult ResultData;
ResultData.Code = EPathFollowingRequestResult::Failed;
if (MoveRequest.IsValid() == false)
{
UE_VLOG(this, LogAINavigation, Error, TEXT("MoveTo request failed due MoveRequest not being valid. Most probably desireg Goal Actor not longer exists"), *MoveRequest.ToString());
return ResultData;
}
if (PathFollowingComponent == nullptr)
{
UE_VLOG(this, LogAINavigation, Error, TEXT("MoveTo request failed due missing PathFollowingComponent"));
return ResultData;
}
ensure(MoveRequest.GetNavigationFilter() || !DefaultNavigationFilterClass);
bool bCanRequestMove = true;
bool bAlreadyAtGoal = false;
if (!MoveRequest.IsMoveToActorRequest())
{
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, INVALID_NAVEXTENT, &AgentProps))
{
UE_VLOG_LOCATION(this, LogAINavigation, Error, MoveRequest.GetGoalLocation(), 30.f, FColor::Red, TEXT("AAIController::MoveTo failed to project destination location to navmesh"));
bCanRequestMove = false;
}
MoveRequest.UpdateGoalLocation(ProjectedLocation.Location);
}
bAlreadyAtGoal = bCanRequestMove && PathFollowingComponent->HasReached(MoveRequest);
}
else
{
bAlreadyAtGoal = bCanRequestMove && PathFollowingComponent->HasReached(MoveRequest);
}
if (bAlreadyAtGoal)
{
UE_VLOG(this, LogAINavigation, Log, TEXT("MoveTo: already at goal!"));
ResultData.MoveId = PathFollowingComponent->RequestMoveWithImmediateFinish(EPathFollowingResult::Success);
ResultData.Code = EPathFollowingRequestResult::AlreadyAtGoal;
}
else if (bCanRequestMove)
{
FPathFindingQuery PFQuery;
const bool bValidQuery = BuildPathfindingQuery(MoveRequest, PFQuery);
if (bValidQuery)
{
FNavPathSharedPtr Path;
FindPathForMoveRequest(MoveRequest, PFQuery, Path);
const FAIRequestID RequestID = Path.IsValid() ? RequestMove(MoveRequest, Path) : FAIRequestID::InvalidRequest;
if (RequestID.IsValid())
{
bAllowStrafe = MoveRequest.CanStrafe();
ResultData.MoveId = RequestID;
ResultData.Code = EPathFollowingRequestResult::RequestSuccessful;
if (OutPath)
{
*OutPath = Path;
}
}
}
}
if (ResultData.Code == EPathFollowingRequestResult::Failed)
{
ResultData.MoveId = PathFollowingComponent->RequestMoveWithImmediateFinish(EPathFollowingResult::Invalid);
}
return ResultData;
}