Individual skill

evo-threejs-obj-export

Generates a Node.js ES module script that dynamically imports a Three.js object definition file, constructs a scene graph, applies a -90 deg X-rotation for Y-up to Z-up coordinate conversion (Blender compatibility), forces world matrix updates, serializes the scene to Wavefront OBJ format using OBJExporter, and writes the result to disk.

tasks-evolved/threejs-to-obj/environment/skills/evo-threejs-obj-export/SKILL.md

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Last checked: Nov 6, 2026

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Repository stars (not skill ratings): 99
Repository last updated: Sep 10, 2026
License: Apache-2.0

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SKILL.mdcore · 2,991 bytes
SKILL.mdcore · 2,991 bytes
scripts/generate_export_script.mjsruns · 2,647 bytes
scripts/run_export.mjsruns · 2,426 bytes

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# evo-threejs-obj-export

## Purpose
Convert Three.js scene definitions (ES module files exporting geometry constructors) into Wavefront OBJ files suitable for import into Blender (Z-up coordinate system).

## Key Concepts

### Pipeline Steps
1. **Dynamic Import**: Load the Three.js object definition file using `await import(filePath)`
2. **Scene Construction**: Call the exported function (e.g., `createScene()`) to get the 3D object hierarchy
3. **Coordinate Transform**: Apply +90° (Math.PI/2) X-rotation to convert Y-up (Three.js) to Z-up (Blender)
4. **Matrix Baking**: Call `scene.updateMatrixWorld(true)` — CRITICAL in headless Node.js (no renderer to auto-update)
5. **OBJ Export**: Use `OBJExporter.parse(scene)` to serialize to OBJ string
6. **File I/O**: Write the OBJ string to disk with `fs.writeFileSync`