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A basketball bounces in a large empty gymnasium. Each bounce is followed by a long bright echo from the hard wood floor and high metal ceiling.

C1-3-30 Steady State · sound_persistence principle: Reverberation (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

  • a basketball
  • a gymnasium

Event: a basketball bounces in a gymnasium

Audio presence

  • a basketball

Sound: a basketball bounce

Key standards

Visual physical commonsense (V-PC)

  • A basketball bounces inside an empty indoor gym.
  • The basketball follows a physically plausible parabolic trajectory between bounces.

Audio physical commonsense (A-PC)

  • Each bounce is followed by a bright ringing reverberation tail.
  • The reverberation character is consistent with reflections off a hard wood floor and high ceiling.

Cross-modal physical commonsense (AV-PC)

  • Each bounce sound onset aligns in time with a visible ball-floor contact.
  • The bounce sounds in the audio originate from the basketball's visible contact events.