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A close-up of ice cracking on a frozen lake with sharp cracking sounds. A scientific voice-over says, "Temperature changes create internal stress."

C1-2-23 Steady State · source_anchoring principle: Non-Diegetic Sound (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

  • ice
  • a frozen lake

Event: ice cracks on a frozen lake

Audio presence

  • cracking ice
  • a narrator

Sound: ['sharp ice cracking', 'a voice-over']

Key standards

Visual physical commonsense (V-PC)

  • A frozen lake with opaque crystalline ice is visibly present.
  • The ice visibly cracks during the clip due to internal stress, with no external strike or impact.
  • The cracking opens an actual gap or fissure through the visible ice.

Audio physical commonsense (A-PC)

  • The voice-over is clean and dry with studio-recording quality and no room reverberation.

Cross-modal physical commonsense (AV-PC)

  • The voice-over plays as a non-diegetic overlay with no visible source in the scene.