CRITICALFailure Reference

Luma Dream Machine Anatomy Artifact — Pre-Generation Risk Reference

Technical Classification

Anatomical Topology & Coherence Failure

Luma Dream Machine's diffusion denoiser produces non-manifold mesh geometry for human anatomy in close-up and motion-heavy shots. The failure is most reproducible in hands (extra or fused fingers, paddle-shaped palms), joints (elbows or knees hinging backwards), and multi-character interactions where occlusion handling breaks down. 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 or leg phasing through torso
✕Fingers fusing into a paddle shape
✕Joint disappearing during fast motion

Real generation examples

Prompt used

"Close-up of a hand typing on a keyboard"

Failure observed @ 0:01

Right hand grew a seventh finger at 0:01; thumb hinged backwards at 0:03

Prompt used

"Two friends hugging in a park"

Failure observed @ 0:04

Arms fused through torsos during hug at 0:04

Documentation strength

If you need to escalate

VERY HIGH — anatomy failures are a recognised critical mode; Luma support refunds with the generation ID and 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 Luma support response credits for anatomy artifacts?

Yes. Anatomy failures are recognised as a known critical mode. Submit the generation ID, the technical term "Anatomical Topology & Coherence Failure", and a timestamped failure point through the Luma billing portal.

Why does Luma 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 Luma 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.

Catch it before you generate

AVA scores this failure mode against your prompt in real time

Free Chrome extension. Analyzes your prompt as you type, flags failure-prone patterns specific to this model, and tells you what to rewrite — before you commit credits to a generation that will fail.

Install free All 105 failure modes

AVA Pro · founders' round

$50 for 6 months of unlimited scoring across all failure modes + personal failure-history dashboard. Locks in $13/mo grandfathered after.

Claim $50 founders