Marble 1.1 Plus is World Labs' highest-fidelity world model. Give it one input (a text prompt, a single image, a 360 panorama, 2 to 8 photos of a scene, or a walkthrough video) and it builds a navigable 3D Gaussian-splat world, dynamically expanding its coverage to produce larger, explorable spaces when the scene allows. It returns a compact .spz splat you can traverse and export to triangle or collider mesh. Best for expansive hero environments: open landscapes, sprawling towns, and cinematic sets for games, film, virtual production, and VR.