RECAST: From Log Replay to Closed-Loop Driving Simulation with View-Complete Actors
This study addresses the challenge of viewpoint-induced rendering artifacts and unreliable observations for dynamic actors in closed-loop driving simulation. To this end, it proposes a two-stage model adaptation strategy based on 3D Gaussian Splatting. By leveraging image-to-3D priors, the method generates view-consistent complete actors from single frames and registers them into the scene, thereby enabling planner-in-the-loop closed-loop interactive simulation. Furthermore, the RECAR dataset is constructed to facilitate controllable evaluation beyond logged trajectories. Experimental results demonstrate that the proposed approach significantly reduces the Fréchet distance while improving the CLIP score. In closed-loop evaluations, the method achieves a collision-free rate of 63% and increases the average Time-to-Collision (TTC) to 2.15 seconds, indicating substantially enhanced safety and realism in autonomous driving simulation.