Contents
Unreal Engine 5.8 · Focused reference
Debugging patterns
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Isolation ladder
- Confirm the Skeletal Mesh uses the expected AnimBP and Skeleton.
- Play the Montage in its editor and preview the intended Section path/Slot.
- Confirm the matching Slot node lies on the evaluated AnimGraph path.
- Play without layering; then restore Layered Blend per Bone/masks.
- Log play return, active montage/instance, current Section, position, weight, and callbacks.
- Disable root motion and notifies separately to isolate pose versus gameplay/movement faults.
- Test standalone, listen server, owning client, simulated client, and dedicated server.
| Symptom | First check |
|---|---|
| Montage reports playing but invisible | missing/bypassed Slot node, wrong Slot/Group |
| Upper body affects legs | layer branch bone/mask and mesh skeleton |
| Stops unexpectedly | competing montage in same Slot Group, ability cancel |
| Combo never advances | Section names, current Section, next-section relink timing |
| Loop never exits | wrong From Section, relink after boundary, stale input |
| Notify callback absent | playback node type, Montage Notify type, Slot/link/filter settings |
| End event missing | interruption/cancel path not handled |
| Mesh snaps to capsule | root motion disabled/mode mismatch/root lock |
| Server/client differ | playback trigger and gameplay state not replicated/predicted coherently |
| Works at normal rate only | notify window/section boundary tied to frames rather than semantics |
Acceptance suite: early/late cancel, overlapping action request, same-group interruption, death/stun, owner destruction, extreme play rate, low FPS, root-motion obstacle, network latency/loss, and every terminal callback.
Sources and version
Documentation target: Unreal Engine 5.8. Confirm behavior in your installed engine; no per-procedure test result is implied.
Read this system’s sources and verification notes →
Canonical reference and AI copy
unreal-animation-montages/references/debugging-patterns.md