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Fix StateRootNodeIndex mapping: use (Count - 1 - index) for reverse ChildProperties order

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Co-authored-by: LoogLong <86428208+LoogLong@users.noreply.github.com>
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copilot-swe-agent[bot] 2026-03-04 03:33:25 +00:00
parent e3030cb0a0
commit c2ea844f0c
1 changed files with 4 additions and 1 deletions
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5
FModel/ViewModels/AnimGraphViewModel.cs
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@ -653,6 +653,8 @@ public class AnimGraphViewModel
metadata.StateNames.Add(stateName); metadata.StateNames.Add(stateName);
// Mark root node via StateRootNodeIndex // Mark root node via StateRootNodeIndex
// UE stores node indices in reverse order relative to ChildProperties,
// so the actual index into animNodeProps is (Count - 1 - stateRootIndex).
if (!stateStruct.TryGetValue(out int stateRootIndex, "StateRootNodeIndex") || if (!stateStruct.TryGetValue(out int stateRootIndex, "StateRootNodeIndex") ||
stateRootIndex < 0 || stateRootIndex >= animNodeProps.Count) stateRootIndex < 0 || stateRootIndex >= animNodeProps.Count)
{ {
@ -660,7 +662,8 @@ public class AnimGraphViewModel
continue; continue;
} }
var rootPropName = animNodeProps[stateRootIndex].name; var mappedIndex = animNodeProps.Count - 1 - stateRootIndex;
var rootPropName = animNodeProps[mappedIndex].name;
metadata.StateRootPropNames.Add(rootPropName); metadata.StateRootPropNames.Add(rootPropName);
if (nodeByName.TryGetValue(rootPropName, out var rootNode)) if (nodeByName.TryGetValue(rootPropName, out var rootNode))
rootNode.AdditionalProperties["BelongsToStateMachine"] = machineName; rootNode.AdditionalProperties["BelongsToStateMachine"] = machineName;