CRITICALFailure Reference

Seedance Anatomy Artifact — Pre-Generation Risk Reference

Technical Classification

Anatomical Topology & Coherence Failure

Seedance 1 Pro's diffusion denoiser produces non-manifold mesh geometry for human anatomy in close-up and motion-heavy shots. The failure is reliably reproducible in hand close-ups (extra or fused fingers, paddle-shaped palms), articulated joint motion (elbows or knees hinging backwards), and multi-character physical contact (limb-through-torso). Output is unusable for any human-subject commercial work.

How to identify this failure

✕Six or seven fingers on a single hand
✕Elbow articulating backwards mid-motion
✕Arm phasing through torso during contact
✕Fingers fusing into a paddle shape
✕Joint disappearing during fast motion

Real generation examples

Prompt used

"Close-up of a guitarist's hands on the fretboard"

Failure observed @ 0:02

Left hand grew a seventh finger at 0:02; thumb hinged backwards at 0:04

Prompt used

"Two friends shaking hands in an office"

Failure observed @ 1:02

Hands merged into a single 9-finger mass during the shake at 1:02

Documentation strength

If you need to escalate

VERY HIGH — anatomy failures are a recognised critical mode; Seedance support refunds with the generation ID + timestamped artifact.

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 Seedance refund credits for anatomy artifacts?

Yes. Submit the generation ID, the technical term "Anatomical Topology & Coherence Failure", and a timestamped failure point. The failure mode is recognised and routinely refunded.

Why does Seedance generate extra fingers?

Diffusion video models lack an explicit skeletal prior — finger count is statistical, not enforced. Close-up hand shots and articulated motion push the model into low-probability regions where topology fails.

How can I avoid Seedance anatomy failures?

Avoid close-up hand shots, finger-detail actions (typing, playing instruments), and multi-character physical contact. AVA flags high-risk anatomy prompts before submission.

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