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A person speaks next to a powerful waterfall. Their voice is almost completely drowned out by the waterfall's continuous roar.

C1-3-16 Steady State · sound_persistence principle: Environmental Masking (Wave)
Seedance 2.0ByteDance · proprietary
Kling 3.0 OmniKuaishou · proprietary
Veo 3.1Google · proprietary
LTX-2.3Lightricks · open
Ovi 1.1character.ai · open
JavisDiT++JavisDiT · open
MagiHumanGAIR-NLP · open
Per-prompt rubric

Basic standards

Visual presence

  • a person
  • a waterfall

Event: a person speaks next to a waterfall

Audio presence

  • a person
  • a waterfall

Sound: ['human speech', 'waterfall roar']

Key standards

Visual physical commonsense (V-PC)

  • The waterfall shows continuous flowing water, and the person visibly moves their mouth while speaking next to it.

Audio physical commonsense (A-PC)

  • The waterfall roar is substantially louder than the voice throughout, and the speech is largely unintelligible.

Cross-modal physical commonsense (AV-PC)

  • The visible mouth movements of the person coincide in time with faint voice segments underneath the dominant waterfall roar.