Compare AI explorable world generators, understand mesh, splat, and proprietary outputs, and export a world for sharing, XR, Unity, or Unreal.
Direct answer
Choose an AI explorable world generator by what remains after generation: Marble favors persistent editable worlds, Echo and SpatialGen favor splat scenes, Hunyuan World uses its own world package, and Skybox provides a surrounding environment rather than a full simulator.
| Model | World type | Current output lane | Best next step |
|---|---|---|---|
| Marble 1.1 | Persistent editable world | SPZ or GLB on the site; provider also documents PLY | Share, view in VR, record, or import with the correct plugin |
| Echo 2 | Generated splat world | SPZ or SOG | Open in a compatible splat runtime |
| AHOLO Spatial Gen | Spatial splat scene | SPZ or PLY | Inspect scale and renderer compatibility |
| Hunyuan World 1.0 | Provider-specific world | WORLD or DRC | Use its documented viewer or conversion path |
| Skybox AI World Mesh | Surrounding environment or mesh | GLB where available | Use as environment shell and verify geometry limits |
Output formats
SPZ stores compressed 3D Gaussian splats rather than a conventional polygon mesh. It retains splat attributes such as position, scale, rotation, opacity, color, and spherical harmonics while reducing file size. Use an SPZ-compatible splat viewer and confirm coordinate-system handling before moving the scene between tools.
SOG means Spatially Ordered Gaussians. It is a lossy, compact container made from a metadata file and compressed image data that stores the properties of a Gaussian-splat scene. Treat the download as a file set and keep its files together when hosting or importing it.
PLY is an openly documented format for vertices and optional polygon faces with custom per-element properties. In a world-generation workflow, a PLY may contain Gaussian-splat point attributes rather than a ready-made triangle mesh. Inspect the header and use a compatible splat tool before assuming it will behave like an OBJ or GLB.
DRC is a raw file compressed with Google Draco, a library for meshes and point clouds. It is optimized for storage and transmission, but it is not a complete scene package by itself: materials, textures, cameras, and other world data may be delivered separately or omitted.
WORLD labels the primary scene file returned by the Hunyuan World provider; it is not a universal interchange standard like glTF. Preserve the original filename and any companion files, then use the provider's documented workflow or convert the result before opening it in a general 3D tool.
A world GLB uses the same binary glTF container as an object GLB, but the contents can be very different: it may be an environment mesh, depth mesh, or a provider-specific scene export. It does not automatically preserve the view-dependent appearance or navigational behavior of a Gaussian-splat world.
Define explorable
An explorable world may mean a hosted scene with camera movement, a Gaussian splat rendered from novel views, a textured mesh imported into an engine, or an interactive stream generated moment by moment. Write down whether the result must persist, be editable, download as a file, support VR, or contain gameplay before choosing a model.
Marble is the strongest fit when persistence, composition, sharing, and documented export matter. Echo and SpatialGen produce splat-oriented scenes. Hunyuan World uses provider-specific packages. Skybox AI can create a convincing environment shell, but a shell is not evidence of walkable geometry, physics, or simulation.
Choose the output
A GLB mesh fits familiar DCC and engine workflows, but generated visual geometry may need cleanup and may differ from collision geometry. SPZ and PLY preserve splat appearance and can look strong from many views, yet require compatible renderers and are not edited like conventional polygons. SOG, WORLD, and DRC should be treated as provider-specific until the target tool documents support.
If the goal is only to show the world, a hosted share link or recorded video may be faster than conversion. If the goal is gameplay, confirm that the export provides a useful visual layer and build collision, navigation, triggers, and logic separately.
Export and validate
Use the site output badge first, then consult the provider export panel and documentation. Marble documents mesh and Gaussian-splat exports plus Unity and Unreal plugin paths. For other providers, verify the current viewer, license, coordinate system, and whether conversion loses appearance before committing to a pipeline.
Walk the expected route and inspect holes, stretched surfaces, floating geometry, scale changes, occluded regions, and loading time. Test close views and edge views that were absent from the source image. A world is ready to share only when navigation and failure boundaries are understandable to the visitor.
Marble is the clearest current choice when you need a persistent public workflow and documented exports. Splat-focused or proprietary models may be better when their visual representation and runtime match your project.
Usually not. The export can provide a visual world, but gameplay projects still need collision, navigation, interaction, performance work, and engine-specific validation.
Decision tables
Discussion
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