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evo-threejs-to-obj

Convert Three.js scene graphs to Wavefront OBJ format suitable for Blender (Z-up coordinate system). Handles InstancedMesh, nested hierarchies, coordinate transforms, and headless Node.js execution.

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

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Sep 10, 2026
License
Apache-2.0

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# evo-threejs-to-obj

## Purpose
Convert Three.js scene graphs to Wavefront OBJ format suitable for Blender (Z-up coordinate system).

## Key Domain Knowledge

### Coordinate System Conversion
- Three.js: Y-up, -Z forward, right-handed
- Blender: Z-up, -Y forward, right-handed
- Apply -90° X rotation: X→X, Y→Z, Z→-Y
- Rotation matrix Rx(-90°): [[1,0,0],[0,0,1],[0,-1,0]]
- Applied AFTER world transform baking, BEFORE writing OBJ