void UCrowdFollowingComponent::FollowPathSegment(float DeltaTime)
{
if (!bEnableCrowdSimulation)
{
Super::FollowPathSegment(DeltaTime);
return;
}
if (bUpdateDirectMoveVelocity)
{
const FVector CurrentTargetPt = DestinationActor.IsValid() ? DestinationActor->GetActorLocation() : GetCurrentTargetLocation();
const FVector AgentLoc = GetCrowdAgentLocation();
const FVector NewDirection = (CurrentTargetPt - AgentLoc).GetSafeNormal();
const bool bDirectionChanged = !NewDirection.Equals(CrowdAgentMoveDirection);
if (bDirectionChanged)
{
CurrentDestination.Set(Path->GetBaseActor(), CurrentTargetPt);
CrowdAgentMoveDirection = NewDirection;
MoveSegmentDirection = NewDirection;
UCrowdManager* Manager = UCrowdManager::GetCurrent(GetWorld());
Manager->SetAgentMoveDirection(this, NewDirection);
UE_VLOG(GetOwner(), LogCrowdFollowing, Log, TEXT("Updated direct move direction for crowd agent."));
}
}
UpdateMoveFocus();
}
void UCrowdFollowingComponent::FollowPathSegment(float DeltaTime)
{
if (!bEnableCrowdSimulation)
{
Super::FollowPathSegment(DeltaTime);
return;
}
if (bUpdateDirectMoveVelocity && DestinationActor.IsValid())
{
const FVector CurrentTargetPt = DestinationActor->GetActorLocation();
const float DistSq = (CurrentTargetPt - GetCurrentTargetLocation()).SizeSquared();
if (DistSq > FMath::Square(10.0f))
{
UCrowdManager* Manager = UCrowdManager::GetCurrent(GetWorld());
const FVector AgentLoc = GetCrowdAgentLocation();
CurrentDestination.Set(Path->GetBaseActor(), CurrentTargetPt);
CrowdAgentMoveDirection = (CurrentTargetPt - AgentLoc).GetSafeNormal();
MoveSegmentDirection = CrowdAgentMoveDirection;
Manager->SetAgentMoveDirection(this, MoveSegmentDirection);
UE_VLOG(GetOwner(), LogCrowdFollowing, Log, TEXT("Updated direct move direction for crowd agent."));
}
}
UpdateMoveFocus();
}
void UCrowdFollowingComponent::SetMoveSegment(int32 SegmentStartIndex)
{
if (!bEnableCrowdSimulation)
{
Super::SetMoveSegment(SegmentStartIndex);
return;
}
PathStartIndex = SegmentStartIndex;
LastPathPolyIndex = PathStartIndex;
if (Path.IsValid() == false || Path->IsValid() == false || GetOwner() == NULL)
{
return;
}
FVector CurrentTargetPt = Path->GetPathPoints()[1].Location;
FNavMeshPath* NavMeshPath = Path->CastPath<FNavMeshPath>();
FAbstractNavigationPath* DirectPath = Path->CastPath<FAbstractNavigationPath>();
if (NavMeshPath)
{
#if WITH_RECAST
if (NavMeshPath->PathCorridor.IsValidIndex(PathStartIndex) == false)
{
// this should never matter, but just in case
UE_VLOG(GetOwner(), LogCrowdFollowing, Error, TEXT("SegmentStartIndex in call to UCrowdFollowingComponent::SetMoveSegment is out of path corridor array's bounds (index: %d, array size %d)")
, PathStartIndex, NavMeshPath->PathCorridor.Num());
PathStartIndex = FMath::Clamp<int32>(PathStartIndex, 0, NavMeshPath->PathCorridor.Num() - 1);
}
// cut paths into parts to avoid problems with crowds getting into local minimum
// due to using only first 10 steps of A*
// do NOT use PathPoints here, crowd simulation disables path post processing
// which means, that PathPoints contains only start and end position
// full path is available through PathCorridor array (poly refs)
ARecastNavMesh* RecastNavData = Cast<ARecastNavMesh>(MyNavData);
const int32 PathPartSize = 15;
const int32 LastPolyIdx = NavMeshPath->PathCorridor.Num() - 1;
int32 PathPartEndIdx = FMath::Min(PathStartIndex + PathPartSize, LastPolyIdx);
FVector PtA, PtB;
const bool bStartIsNavLink = RecastNavData->GetLinkEndPoints(NavMeshPath->PathCorridor[PathStartIndex], PtA, PtB);
const bool bEndIsNavLink = RecastNavData->GetLinkEndPoints(NavMeshPath->PathCorridor[PathPartEndIdx], PtA, PtB);
if (bStartIsNavLink)
{
PathStartIndex = FMath::Max(0, PathStartIndex - 1);
}
if (bEndIsNavLink)
{
PathPartEndIdx = FMath::Max(0, PathPartEndIdx - 1);
}
bFinalPathPart = (PathPartEndIdx == LastPolyIdx);
if (!bFinalPathPart)
{
RecastNavData->GetPolyCenter(NavMeshPath->PathCorridor[PathPartEndIdx], CurrentTargetPt);
}
else if (NavMeshPath->IsPartial())
{
RecastNavData->GetClosestPointOnPoly(NavMeshPath->PathCorridor[PathPartEndIdx], Path->GetPathPoints()[1].Location, CurrentTargetPt);
}
// not safe to read those directions yet, you have to wait until crowd manager gives you next corner of string pulled path
CrowdAgentMoveDirection = FVector::ZeroVector;
MoveSegmentDirection = FVector::ZeroVector;
CurrentDestination.Set(Path->GetBaseActor(), CurrentTargetPt);
LogPathPartHelper(GetOwner(), NavMeshPath, PathStartIndex, PathPartEndIdx);
UE_VLOG_SEGMENT(GetOwner(), LogCrowdFollowing, Log, MovementComp->GetActorFeetLocation(), CurrentTargetPt, FColor::Red, TEXT("path part"));
UE_VLOG(GetOwner(), LogCrowdFollowing, Log, TEXT("SetMoveSegment, from:%d segments:%d%s"),
PathStartIndex, (PathPartEndIdx - PathStartIndex)+1, bFinalPathPart ? TEXT(" (final)") : TEXT(""));
UCrowdManager* CrowdManager = UCrowdManager::GetCurrent(GetWorld());
if (CrowdManager)
{
CrowdManager->SetAgentMovePath(this, NavMeshPath, PathStartIndex, PathPartEndIdx);
}
#endif
}
else if (DirectPath)
{
// direct paths are not using any steering or avoidance
// pathfinding is replaced with simple velocity request
const FVector AgentLoc = MovementComp->GetActorFeetLocation();
bFinalPathPart = true;
bCheckMovementAngle = true;
bUpdateDirectMoveVelocity = true;
CurrentDestination.Set(Path->GetBaseActor(), CurrentTargetPt);
CrowdAgentMoveDirection = (CurrentTargetPt - AgentLoc).GetSafeNormal();
MoveSegmentDirection = CrowdAgentMoveDirection;
UE_VLOG(GetOwner(), LogCrowdFollowing, Log, TEXT("SetMoveSegment, direct move"));
UE_VLOG_SEGMENT(GetOwner(), LogCrowdFollowing, Log, AgentLoc, CurrentTargetPt, FColor::Red, TEXT("path"));
UCrowdManager* CrowdManager = UCrowdManager::GetCurrent(GetWorld());
if (CrowdManager)
{
CrowdManager->SetAgentMoveDirection(this, CrowdAgentMoveDirection);
}
}
else
{
UE_VLOG(GetOwner(), LogCrowdFollowing, Error, TEXT("SetMoveSegment, unknown path type!"));
}
}