Overview of the Light4D framework. Our training-free approach employs a time-aware paradigm in a latent flow-matching process. Using a multi-phase adaptive schedule λ(t), we prioritize 3D geometric completion via the EX-4D backbone before injecting illumination cues through IC-Light.

Design of Temporal Consistent Attention (TCA). TCA enforces temporal coherence through a dual-path mechanism that interpolates between standard self-attention (Path A) for frame-specific structure and a consistent path (Path B) that regularizes appearance context via Gaussian-weighted sliding window aggregation.