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A drummer loosens the lugs on a drum head and hits it for a low flabby thud. After tightening the lugs, the next hit rings brighter and sharper.

C2-1-09 Event Transition · source_body principle: Tension -> Pitch (Mechanics)
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 drum
  • a drummer

Event: a drum head is struck

Audio presence

  • a drum

Sound: a drum hit

Key standards

Visual physical commonsense (V-PC)

  • The drum head is struck twice, and between the two strikes the drum's lugs are visibly turned by hand or with a tool.

Audio physical commonsense (A-PC)

  • The second drum hit is noticeably brighter and higher in pitch than the first drum hit.

Cross-modal physical commonsense (AV-PC)

  • Each drum hit sound aligns in time with a visible strike on the drum head.
  • The brighter and higher-pitched hit follows the lug-tightening adjustment.
  • The lower and flabbier hit follows the lug-loosening adjustment.