← all videos

A metal triangle is struck once and the bright ringing tone sustains, slowly fading until it disappears into silence.

C1-3-01 Steady State · sound_persistence principle: Attenuation & Decay (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 metal triangle
  • a beater

Event: a metal triangle is struck with a beater

Audio presence

  • a metal triangle

Sound: a metal triangle ring

Key standards

Visual physical commonsense (V-PC)

  • The beater visibly strikes the metal triangle on its body.
  • The object struck is a metal triangle, formed as a bent metal rod with an open triangular loop.

Audio physical commonsense (A-PC)

  • The ringing tone sustains after the strike and then decays to silence before the clip ends.
  • The ringing tone has the bright, sustained, metallic timbre of a struck triangle.

Cross-modal physical commonsense (AV-PC)

  • The ringing tone onset aligns temporally with the visible strike of the triangle.