Veo 3.1: Model ignores negative prompts for non-humanoid character anatomy

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Hello, I’m working on a 3D animation project using Veo 3.1 in Google Labs Flow. My characters are non-biological, leg-only spheres (based on provided reference sheets).

The Problem: > The model consistently generates arms, hands, and shoulders during dialogue and action sequences, directly violating strict negative prompts.

Steps taken:

  1. Provided high-quality reference images showing armless characters.

  2. Included explicit instructions: “No arms”, “No hands”, “Armless”, “Leg-only entities”.

  3. Used technical terms like “Hermetically sealed spherical bodies” and “Zero upper appendages”.

Despite this, the model persists in adding human-like limbs. It appears the model’s training on human gesticulation is overriding the input constraints. Is there a way to “hard-lock” character anatomy to prevent the AI from hallucinating these limbs?

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