BulletTime ablation: Time-RoPE alone beats RoPE + AdaLN on PSNR, zero new parameters
GordonWetzstein · x · 2026-09-09
A surprising finding from BulletTime: changing positional encoding can outperform adding learned conditioning. In time-control ablations, Time-RoPE alone beat standard RoPE + AdaLN on PSNR with no learnable parameters; combining both worked best. BulletTime also decouples frame index from world time for explicit time/camera control.
Related event: Stanford's BulletTime Decouples Frame Index from World Time(2 posts)→
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