Scene formats explained
Understand the Gaussian splat behind your scene
JST-2 can decode its world representation into 3D Gaussian splats. For the studio’s scene workflow, the downloadable spatial asset is an SPZ file. It serves a different purpose from the panorama preview.
A scene rendered from spatial elements
Gaussian splatting represents a scene using many spatial elements with properties that control their appearance during rendering. A renderer projects and blends those elements to form a view. This differs from drawing the connected triangles of a conventional polygon mesh.
In JST-2, Physics-Native Tokens are the model’s internal representation of persistent parts with position, attributes and dynamics. Viggle describes decoding those tokens into images or Gaussian splats. The exported splat should not be confused with direct access to the model’s internal tokens.
Keep the panorama, SPZ and mesh concepts distinct
A panorama is an image of the surroundings. An SPZ is a packaged Gaussian-splat asset for a compatible spatial renderer. A polygon mesh describes surfaces with vertices and faces. These representations support different editing and viewing workflows.
A successful SPZ download therefore does not guarantee OBJ, FBX or STL output. Creating a usable mesh from a splat requires a separate process with its own quality limitations. For printing, simulation or mesh editing, establish the required geometry before choosing your generation workflow.
Explore generated content without generating it again
The official JST-2 release describes local browser rendering of decoded splats. Once a scene exists, viewing it from another angle does not require rerunning the model. Generating new scene content is a separate operation that does require inference.
Use a renderer that supports the returned file format. A browser being able to display the panorama does not prove it can load the SPZ. Loading behavior and interactive performance also depend on the asset, the rendering implementation and the device used to view it.
Inspect the viewpoints your project actually needs
Review foreground edges, thin structures and gaps between objects while moving through relevant viewpoints. Floating elements or incomplete surfaces can become more obvious away from the initial camera. A good panorama is useful evidence of appearance, but insufficient evidence of a robust spatial result.
Keep the original downloaded asset when testing other tools. Confirm that a receiving application supports SPZ specifically rather than assuming all Gaussian-splat formats are interchangeable. Viggle lists higher splat counts for finer detail as upcoming, so do not assume that future version is the current output.
Questions & answers
Is an SPZ file a 3D model?
It is a spatial scene asset based on Gaussian splats. In the broad sense it represents 3D content, but it is not the same as a polygon mesh with editable faces. Specify the representation when discussing requirements with another tool or team.
Can I upload any SPZ file to this page?
No. This page explains the format and links to scene generation. It does not offer a general-purpose file opener. To view a downloaded scene elsewhere, choose software that explicitly supports its format.
Does an SPZ automatically contain collision geometry?
Do not assume it does. A splat describes renderable appearance; usable collision geometry is a separate requirement for an interactive application. JST-2’s physics-native terminology does not guarantee that every downloaded scene contains a complete collision setup.
Check the original sources.
Reviewed . Model claims are attributed to Viggle; practical suggestions are editorial guidance.