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name: scenario-3d-worlds description: "Use when generating navigable 3D worlds or Gaussian splat scenes on Scenario via MCP: text-to-world, image-to-world, a 360 panorama or skybox turned into a walkable splat, multi-view photos or a video walkthrough reconstructed as a splat, or one object photo to splat. Keywords: World Labs Marble 1.1, 1.1 Plus, 1.0 Draft, Hunyuan World, HY World, image-to-skybox, skybox-to-splat, multiview-to-splat, TripoSplat, gaussian splatting, 3DGS, spz, world generation, explorable scene, VR." license: MIT

Scenario 3D Worlds

Overview

These models build explorable environments as 3D Gaussian splats, not polygon meshes: volumetric scenes to walk through and render in real time, with no UVs or topology to edit (Marble splats also export to triangle or collider mesh). Three vendors sit side by side: World Labs Marble in three quality tiers, Hunyuan's HY World pipeline, and TripoSplat for single objects. Discover them with search and treat model_schema_get as the contract; HY World members carried a geo restriction tag at authoring time, so hits differ by team and region.

Connection and the core loop: see the scenario skill; polygon meshes, rigging, and the 3D viewer: the scenario-3d skill; skybox-only work with no splat stage: the scenario-skyboxes skill. If a sibling skill named here is missing from your available skills, ask the user to install it (npx skills add scenario-labs/skills --skill <name>); unattended, proceed from tool schemas and flag the gap.

Quick reference

Pick the member by what you already have (input names from the live schemas):

You have	Member	Inputs
A text idea	Marble, any tier	prompt alone
One image, flat or 360	Marble	images, one entry; isPano: true if 360
2 to 8 photos of one scene	Marble	images
A walkthrough video	Marble or HY Multi-view to Splat	video
Many overlapping photos	HY Multi-view to Splat	images, 2 to 64 at authoring time
One photo of a place	HY Image to Skybox, then Skybox to Splat	image, then panorama
One photo of an object	TripoSplat	image; background removal is automatic

images and video are mutually exclusive wherever both exist; isPano applies only when exactly one image is passed. TripoSplat wants one clean object and every other member wants a scene: aiming either at the other's subject is the main failure mode.

Draft on Marble, then upgrade

The three Marble tiers (1.0 Draft, 1.1, 1.1 Plus) take identical inputs, and the same inputs with the same seed reproduce the same world on every tier. Iterate on Draft, which returned in about a minute at authoring time, then rerun the identical parameters on 1.1 (balanced) or 1.1 Plus (highest fidelity, dynamically grows larger worlds when the scene allows). The cost spread across tiers was more than tenfold at authoring time, so dry_run before committing. splatResolution picks the stored density (100k, 500k, full); disableRecaption: true stops Marble rewriting your prompt.

The HY World pipeline runs long

Image to Skybox is an image model, not a 3D one: it expands one photo of a place into a 2:1 equirectangular panorama (backend trades full fidelity against qwen speed and cost). Its output asset id goes to Skybox to Splat as panorama. There, the three trajectory toggles (applyNavTraj, applyUpRoute, applyReconIteration, default true) drive cost and time; maxSteps sharpens marginally and materially moves neither. The splat stage ran close to an hour at median at authoring time: keep re-calling jobs_wait with pending_job_ids; a timeout is not a failure and never justifies a second model_run. Multi-view to Splat is the opposite, fast and cheap: best when the camera moved through a static scene with parallax.

Worked example: graybox a level from a concept image

1. search with target="models", query="marble world", public=true. Tiers appear side by side, e.g. model_worldlabs-marble-1-0-draft (a live hit at authoring time: re-discover each session).
2. model_schema_get with the Draft id: fields, caps, and defaults before anything else.
3. upload_asset the concept image (see the scenario skill) for an asset id.
4. model_run with dry_run=true and parameters={"images": ["asset_x"], "prompt": "abandoned observatory interior, dusk light through the dome slit", "seed": 1234, "splatResolution": "full"}; repeat the dry run on the 1.1 id to see the upgrade cost.
5. model_run on Draft with wait=false, then jobs_wait with the job id, re-called with pending_job_ids on timeout.
6. asset_display the splat and walk it; adjust and repeat on Draft until the layout is right.
7. Rerun the identical parameters, same seed, on the 1.1 or 1.1 Plus id from step 1, then asset_download the final .spz.

Common mistakes

• Passing images and video together: mutually exclusive on Marble and Multi-view to Splat.
• A single equirectangular input without isPano: true: Marble reads it as a flat photo.
• Changing or omitting seed between the draft and the upgrade tier: a different world comes back.
• Feeding TripoSplat a scene, or a world model a lone object.
• Treating a jobs_wait timeout on Skybox to Splat as a failure: the job is still running.
• Adjusting maxSteps to buy quality or cut cost: the trajectory toggles move cost, maxSteps barely moves sharpness.
• Expecting UVs or editable topology from a splat: for polygon assets, use the mesh generators in scenario-3d.