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A person walks up wooden stairs with warm hollow footsteps. Then walks onto a metal staircase, and each footfall rings brighter and more metallic.

C2-1-31 Event Transition · source_body principle: Material Comparison (Material)
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
  • wooden stairs
  • a metal staircase

Event: a person walks up stairs

Audio presence

  • footsteps

Sound: footstep impacts

Key standards

Visual physical commonsense (V-PC)

  • The person walks up both a wooden staircase and a metal staircase within the clip, with natural gait and plausible foot placement on each.

Audio physical commonsense (A-PC)

  • The wooden-stair footsteps have a warm hollow timbre and the metal-stair footfalls have a distinctly brighter, more metallic ringing timbre.

Cross-modal physical commonsense (AV-PC)

  • Each footstep sound coincides in time with a visible foot landing on its corresponding surface.
  • The warm hollow timbre corresponds to footsteps on the wooden staircase.
  • The brighter, more metallic ringing corresponds to footsteps on the metal staircase.