CRITICALFailure Reference

Vidu Anatomy Artifact — Pre-Generation Risk Reference

Technical Classification

Anatomical Topology & Coherence Failure

Anatomical Topology & Coherence Failure on Vidu (ShengShu) occurs when the diffusion-transformer model produces skeletal configurations with non-manifold topology. Vidu's Reference-to-Video pipeline is especially prone to this when the source reference contains partial occlusion of limbs — the model invents geometry that violates real-world articulation. This is most severe in dance, sports, and multi-character prompts at clips longer than 4 seconds.

How to identify this failure

✕Extra arm or leg appearing mid-clip on Vidu
✕Elbow or knee bending backward against natural articulation
✕Limb passing through torso or another character
✕Joint geometry collapsing into a single mesh
✕Reference-to-Video output adds limbs that weren't in the reference image

Real generation examples

Prompt used

"Three dancers in unison performing a contemporary piece, stage lighting"

Failure observed @ 2.4s

Middle dancer grew a third arm at 2.4s, leg geometry collapsed at 5.1s

Prompt used

"Basketball player driving to the basket, slow motion"

Failure observed @ 1.8s

Player's left arm bent backward at the elbow at 1.8s, finger count became 6

Documentation strength

If you need to escalate

HIGH — Vidu support (ShengShu) approves credit refunds for limb artifacts when the Generation ID and timestamped failure are provided in the audit report.

AVA is a pre-purchase prevention tool, not a post-purchase recovery tool. Platforms generally do not guarantee credit refunds for output-quality failures; goodwill credits are at each platform's discretion. The strength rating reflects how well-formed your support ticket can be, not a promised outcome.

Prevention + documentation steps

01
Score your prompt before you generate
Run your prompt through AVA's pre-flight scoring against the Anatomical Topology & Coherence Failure pattern. Green light = generate. Yellow/red = rewrite using the suggested fix before you commit credits.
02
Capture Generation ID + timestamp if it failed anyway
Find the Generation ID in the URL or share link. Note the exact time when the Anatomical Topology & Coherence Failure first appears (e.g. "failure first visible at 1.2s"). Timestamped evidence is significantly stronger than a general complaint.
03
Use the correct technical term in your support ticket
Describe this failure as "Anatomical Topology & Coherence Failure". This term maps to a recognised internal workflow in the support system and routes the ticket to the right team.
04
Submit via the correct support channel
Runway has no direct email intake. Pro+ plan: open the in-app AI Assistant (help widget bottom-right of app.runwayml.com), describe the failure with the technical term, attach evidence. Free/Standard plan: human support isn't available — your channel is Discord #community-help with @On Call - Moderators.

Frequently asked questions

Does Vidu refund credits for anatomy failures?

Yes. Vidu's support team has been responsive to support tickets when the report includes a Generation ID, the correct technical term ("Anatomical Topology & Coherence Failure"), and a timestamp of the visible failure. AVA generates this report automatically.

Which Vidu prompts are highest risk for anatomy failures?

Multi-character scenes, sports, dance, and Reference-to-Video where the reference image has partial-limb occlusion. AVA's L1 scanner flags these before you spend credits.

Is Vidu 2.0 better than Vidu 1.5 for anatomy?

Marginally — Vidu 2.0 improved hand and finger fidelity, but limb-count hallucination on multi-character prompts is statistically similar. Treat both versions as anatomy-risky for human-figure prompts.

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