Why do AI-generated videos often look good but break physics?

Google researchers with University of Copenhagen and Oxford introduced VGGRPO a new method that trains a latent geometry model to directly read scene depth and motion from a video diffusion model’s internal representations.

Then it uses reinforcement learning to reward smooth camera paths and consistent 3D geometry.

Result: VGGRPO outperforms prior approaches in camera stability, geometry consistency, and overall quality while eliminating expensive VAE decoding.