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A drummer hits the center of a snare drum, producing a full warm tone. Then hits near the edge with the same force, producing a thinner, brighter sound.

C2-1-23 Event Transition · source_body principle: Combined Frequency Factors (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 snare drum
  • a drumstick
  • a drummer

Event: a drummer strikes a snare drum

Audio presence

  • a snare drum

Sound: a snare drum hit

Key standards

Visual physical commonsense (V-PC)

  • The drumstick strikes the snare drum twice, with the first strike near the center of the drum head and the second strike near the edge of the same head.

Audio physical commonsense (A-PC)

  • The second hit near the edge is noticeably thinner and brighter in timbre than the first hit near the center.
  • Each hit has the characteristic snare drum impact timbre.

Cross-modal physical commonsense (AV-PC)

  • Each hit sound aligns in time with a visible strike of the drumstick on the snare drum.
  • The brighter and thinner hit corresponds to the edge strike.
  • The full warm hit corresponds to the center strike.