Global Motion Corresponder for 3D Point-Based Scene Interpolation under Large Motion

Existing dynamic scene interpolation methods typically assume that the motion between consecutive time steps is small enough so that displacements can be locally approximated by linear models. In practice, even slight deviations from this small-motion assumption can cause conventional techniques to fail. In this paper, we introduce Global Motion Corresponder (GMC), a novel approach that robustly handle large motion and achieves smooth transitions. GMC learns a unary potential field that predicts SE(3) mappings into a shared canonical space, balancing correspondence, spatial and semantic smoothness, and local rigidity. We demonstrate that our method significantly outperforms existing baselines on 3D scene interpolation when the two states undergo large global motions. Furthermore, our method enables extrapolation where other baseline methods cannot.