World Labs Export & Integration Skill

World Labs Export & Integration

Export generated worlds in various formats for use in game engines, 3D software, and web applications.

Export Formats Overview

| Format | Type | Best For | | ----------------- | -------------- | ------------------------------ | | SPZ (2M/500K) | Gaussian Splat | Native format, highest quality | | PLY (2M/500K) | Gaussian Splat | Wide compatibility | | Collider Mesh | GLB | Physics, collision | | High-Quality Mesh | GLB | Rendering, modification | | 360 Panorama | PNG | Skyboxes, previews |

How to Export from Marble

Navigate to your generated world viewer
Open the Download Menu
Select desired format:
- Splats (SPZ) - High resolution
- Splats (low-res SPZ) - 500K, lighter compute
- Splats (PLY) - High resolution, universal compatibility
- Splats (low-res PLY) - 500K, universal
- Collider Mesh (GLB) - Instant download
- High-quality mesh (GLB) - Up to 1 hour processing
- 360 Panorama

Gaussian Splat Exports

SPZ Format (Native)

World Labs' native Gaussian splat format, optimized for file size:

| Variant | Splat Count | Use Case | | -------- | ----------- | ------------------- | | SPZ 2M | ~2,000,000 | Maximum quality | | SPZ 500K | ~500,000 | Lightweight, mobile |

Advantages:

Smallest file size
Optimized for Marble rendering
Fast loading in supported viewers

PLY Format (Compatible)

Standard point cloud format for broader software support:

| Variant | Splat Count | Compatibility | | -------- | ----------- | ------------- | | PLY 2M | ~2,000,000 | Universal | | PLY 500K | ~500,000 | Universal |

Advantages:

Wide software support
Works with most third-party splat viewers
No conversion needed for many tools

Conversion Tool:

SPZ to PLY: https://spz-to-ply.netlify.app/

Mesh Exports

Collider Mesh (GLB)

Low-poly mesh for physics and collision:

| Property | Specification | | -------------- | ---------------------------- | | Triangle count | 100,000 - 200,000 | | File size | 3-4 MB | | UVs | None | | Use | Collision detection, physics | | Download | Instant |

High-Quality Mesh (GLB)

Detailed mesh for rendering—two variants available:

| Variant | Triangles | Features | | ------------- | ---------- | --------------------- | | Textured | ~600,000 | Texture maps included | | Vertex Colors | ~1,000,000 | Material flexibility |

| Property | Specification | | --------------- | ----------------------- | | File size | 100-200 MB | | Processing time | Up to 1 hour | | Rate limit | 4 requests/hour | | Availability | Only for worlds you own |

Image Exports

360 Panorama

| Property | Specification | | ---------- | ----------------------------------- | | Resolution | 2560 × 1280 | | Format | Equirectangular PNG | | Use | Skyboxes, VR preview, presentations |

Coordinate System

As of December 2025, World Labs defaults to OpenGL convention:

       -Y (down)
        │
        │
        │
        └───────→ +X (left)
       ╱
      ╱
     ↙
    -Z (forward)

| Axis | Direction | | ---- | --------------------- | | +X | Left | | -Y | Down | | -Z | Forward (into screen) |

Legacy OpenCV convention (older exports):

+X left, +Y down, +Z forward
To convert: Scale Y and Z axes by -1

Conversion to Other Systems

To Unity (Left-handed Y-up):

Unity.x = WorldLabs.x
Unity.y = -WorldLabs.y
Unity.z = -WorldLabs.z

Scale: 1 unit = 1 meter

To Unreal (Left-handed Z-up):

Unreal.x = -WorldLabs.z * 100  // cm
Unreal.y = WorldLabs.x * 100
Unreal.z = -WorldLabs.y * 100

Scale: 1 unit = 1 centimeter

To Blender (Right-handed Z-up):

Blender.x = WorldLabs.x
Blender.y = -WorldLabs.z
Blender.z = -WorldLabs.y

Scale: 1 unit = 1 meter

Engine Integrations

Spark.js (Web) — Recommended

Three.js-based web viewer, native integration with World Labs:

URL: https://sparkjs.dev/
Best for: VR experiences, interactive web games, custom applications
Support: Active community in World Labs Discord

Unity

Plugin: aras-p UnityGaussianSplatting (Free)

| Setting | Recommendation | | --------------- | -------------------- | | Unity version | 6.0 (for VR) or 6.1 | | Render pipeline | URP with HDR enabled | | Graphics API | Vulkan (for VR) | | File format | PLY 2M or SPZ 2M |

Notes:

500K SPZ files may require conversion to PLY
For VR (Quest 3): 500K splats perform better than 2M
Combine multiple splat components into single component for better draw-order

Unreal Engine

Multiple third-party plugins available:

| Plugin | Notes | | ------------------------ | ------------------------------------------------------------------------------------------------ | | Postshot | Recommended. Free version available. Requires standalone Windows app, convert SPZ to PSHT format | | Volinga | Paid. Supports depth of field, nDisplay for virtual production | | 3D Gaussians (Akiya) | Paid. Most reliable, automatic quality splitting, nDisplay support |

Note: Convert SPZ to PLY if plugin requires it.

Blender

Multiple third-party plugins:

| Plugin | URL | Notes | | --------------- | ------------------- | -------------------------------------- | | KIRI Engine | kiriengine.app | Most maintained, verified Blender 4.2+ | | Reshot AI | github.com/ReshotAI | Better performance, straightforward | | SplatForge | splatforge.cloud | Most performant, separate render pass |

Houdini

Plugin: GSOPs

URL: github.com/cgnomads/GSOPs
Compatibility: Houdini 20.5
Features: Splat animation, VDB/mesh conversion

Format Selection Guide

| Need | Recommended Format | | ------------------- | -------------------- | | Web viewer | SPZ 500K or PLY 500K | | Desktop VR | PLY 500K | | Archive/Quality | SPZ 2M or PLY 2M | | Game engine physics | Collider Mesh GLB | | 3D editing | HQ Mesh GLB + PLY | | Quick preview | 360 Panorama | | Mobile/Quest VR | PLY 500K |

Troubleshooting

| Issue | Solution | | ------------------------- | ----------------------------------------------- | | Assets appear upside-down | Check coordinate system; may need Y/Z axis flip | | Wrong scale in engine | Unity uses meters, Unreal uses centimeters | | 500K SPZ not loading | Convert to PLY using spz-to-ply.netlify.app | | Draw-order issues | Combine multiple splats into single component |

Related Skills

world-labs-api - API integration
world-labs-studio - Compose and record before export
world-labs-chisel - Create geometry for generation

Agent Skills: World Labs Export & Integration

Install this agent skill to your local

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