void UBehaviorTreeGraph::RemoveOrphanedNodes()
{
UBehaviorTree* BTAsset = CastChecked<UBehaviorTree>(GetOuter());
// Obtain a list of all nodes that should be in the asset
TSet<UBTNode*> AllNodes;
for (int32 Index = 0; Index < Nodes.Num(); ++Index)
{
UBehaviorTreeGraphNode* MyNode = Cast<UBehaviorTreeGraphNode>(Nodes[Index]);
if (MyNode)
{
UBTNode* MyNodeInstance = Cast<UBTNode>(MyNode->NodeInstance);
if (MyNodeInstance)
{
AllNodes.Add(MyNodeInstance);
}
for (int32 iDecorator = 0; iDecorator < MyNode->Decorators.Num(); iDecorator++)
{
UBehaviorTreeGraphNode_CompositeDecorator* SubgraphNode = Cast<UBehaviorTreeGraphNode_CompositeDecorator>(MyNode->Decorators[iDecorator]);
if (SubgraphNode)
{
TArray<UBTDecorator*> NodeInstances;
TArray<FBTDecoratorLogic> DummyOps;
SubgraphNode->CollectDecoratorData(NodeInstances, DummyOps);
for (int32 SubIdx = 0; SubIdx < NodeInstances.Num(); SubIdx++)
{
AllNodes.Add(NodeInstances[SubIdx]);
}
}
else
{
UBTNode* MyDecoratorNodeInstance = MyNode->Decorators[iDecorator] ? Cast<UBTNode>(MyNode->Decorators[iDecorator]->NodeInstance) : NULL;
if (MyDecoratorNodeInstance)
{
AllNodes.Add(MyDecoratorNodeInstance);
}
}
}
for (int32 iService = 0; iService < MyNode->Services.Num(); iService++)
{
UBTNode* MyServiceNodeInstance = MyNode->Services[iService] ? Cast<UBTNode>(MyNode->Services[iService]->NodeInstance) : NULL;
if (MyServiceNodeInstance)
{
AllNodes.Add(MyServiceNodeInstance);
}
}
}
}
// Obtain a list of all nodes actually in the asset and discard unused nodes
TArray<UObject*> AllInners;
const bool bIncludeNestedObjects = false;
GetObjectsWithOuter(BTAsset, AllInners, bIncludeNestedObjects);
for (auto InnerIt = AllInners.CreateConstIterator(); InnerIt; ++InnerIt)
{
UBTNode* Node = Cast<UBTNode>(*InnerIt);
if (Node && !AllNodes.Contains(Node))
{
Node->SetFlags(RF_Transient);
Node->Rename(NULL, GetTransientPackage(), REN_DontCreateRedirectors | REN_NonTransactional | REN_ForceNoResetLoaders);
}
}
}
void CreateChildren(UBehaviorTree* BTAsset, UBTCompositeNode* RootNode, const UBehaviorTreeGraphNode* RootEdNode, uint16* ExecutionIndex, uint8 TreeDepth)
{
if (RootEdNode == NULL)
{
return;
}
RootNode->Children.Reset();
RootNode->Services.Reset();
// collect services
if (RootEdNode->Services.Num())
{
for (int32 i = 0; i < RootEdNode->Services.Num(); i++)
{
UBTService* ServiceInstance = RootEdNode->Services[i] ? Cast<UBTService>(RootEdNode->Services[i]->NodeInstance) : NULL;
if (ServiceInstance)
{
if (Cast<UBehaviorTree>(ServiceInstance->GetOuter()) == NULL)
{
ServiceInstance->Rename(NULL, BTAsset);
}
ServiceInstance->InitializeNode(RootNode, *ExecutionIndex, 0, TreeDepth);
*ExecutionIndex += 1;
RootNode->Services.Add(ServiceInstance);
}
}
}
// gather all nodes
int32 ChildIdx = 0;
for (int32 PinIdx = 0; PinIdx < RootEdNode->Pins.Num(); PinIdx++)
{
UEdGraphPin* Pin = RootEdNode->Pins[PinIdx];
if (Pin->Direction != EGPD_Output)
{
continue;
}
// sort connections so that they're organized the same as user can see in the editor
Pin->LinkedTo.Sort(FCompareNodeXLocation());
for (int32 Index = 0; Index < Pin->LinkedTo.Num(); ++Index)
{
UBehaviorTreeGraphNode* GraphNode = Cast<UBehaviorTreeGraphNode>(Pin->LinkedTo[Index]->GetOwningNode());
if (GraphNode == NULL)
{
continue;
}
UBTTaskNode* TaskInstance = Cast<UBTTaskNode>(GraphNode->NodeInstance);
if (TaskInstance && Cast<UBehaviorTree>(TaskInstance->GetOuter()) == NULL)
{
TaskInstance->Rename(NULL, BTAsset);
}
UBTCompositeNode* CompositeInstance = Cast<UBTCompositeNode>(GraphNode->NodeInstance);
if (CompositeInstance && Cast<UBehaviorTree>(CompositeInstance->GetOuter()) == NULL)
{
CompositeInstance->Rename(NULL, BTAsset);
}
if (TaskInstance == NULL && CompositeInstance == NULL)
{
continue;
}
// collect decorators
TArray<UBTDecorator*> DecoratorInstances;
TArray<FBTDecoratorLogic> DecoratorOperations;
CollectDecorators(BTAsset, GraphNode, DecoratorInstances, DecoratorOperations, true, RootNode, ExecutionIndex, TreeDepth, ChildIdx);
// store child data
RootNode->Children.AddZeroed();
FBTCompositeChild& ChildInfo = RootNode->Children[ChildIdx];
ChildInfo.ChildComposite = CompositeInstance;
ChildInfo.ChildTask = TaskInstance;
ChildInfo.Decorators = DecoratorInstances;
ChildInfo.DecoratorOps = DecoratorOperations;
ChildIdx++;
UBTNode* ChildNode = CompositeInstance ? (UBTNode*)CompositeInstance : (UBTNode*)TaskInstance;
if (ChildNode && Cast<UBehaviorTree>(ChildNode->GetOuter()) == NULL)
{
ChildNode->Rename(NULL, BTAsset);
}
InitializeInjectedNodes(GraphNode, RootNode, *ExecutionIndex, TreeDepth, ChildIdx);
// special case: subtrees
UBTTask_RunBehavior* SubtreeTask = Cast<UBTTask_RunBehavior>(TaskInstance);
if (SubtreeTask)
{
*ExecutionIndex += SubtreeTask->GetInjectedNodesCount();
}
ChildNode->InitializeNode(RootNode, *ExecutionIndex, 0, TreeDepth);
*ExecutionIndex += 1;
VerifyDecorators(GraphNode);
if (CompositeInstance)
{
CreateChildren(BTAsset, CompositeInstance, GraphNode, ExecutionIndex, TreeDepth + 1);
CompositeInstance->InitializeComposite((*ExecutionIndex) - 1);
}
}
}
}