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A diver clacks two stones together underwater. The sound comes out sharp, bright, and slightly muffled.

C1-3-11 Steady State · sound_persistence principle: Liquid as Medium (Fluid)
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 diver
  • two stones
  • water

Event: a diver clacks two stones together underwater

Audio presence

  • two stones

Sound: stones clacking

Key standards

Visual physical commonsense (V-PC)

  • A diver underwater visibly strikes two stones together with a clacking contact motion.

Audio physical commonsense (A-PC)

  • The audible clack has a sharp bright stone-on-stone character with slight underwater muffling.

Cross-modal physical commonsense (AV-PC)

  • The clack onset coincides temporally with the visible contact of the two stones.