NodeJS APP to Batch Convert fbx files to glb and Fast Optimization (Draco -- Texture Compression).

✓ Setup NodeJS

• Install NodeJS from https://nodejs.org/en
• Download or Clone this Repository
• Open a Terminal (Usign for example VSCode)
• RUN: npm install (To Install NPM Libraries)

✓ Setup Your FBX Files

• Copy your FBX Files in "_input" directory, also you can use subdirectories

✓ Convert FBX to GLB

• RUN: node convert.js
• Your Files will be converted in "_output" directory using the same structure
• View the log and wait till finished

✓ Optimize GLB Files

• RUN: node optimize.mjs
• Your files located in "_output" directory will be optimized to "_optimized" folder
• You can tweak optimize.mjs code to adapt it to your needs (ie. const imageFormat = 'webp'; const imageSize = 512;)
• View the log and wait till finished

✓ Merge GLB Animations

• Combines animations from a source animation GLB file into a target character GLB file.
• Retargets rotation keyframes using world-space change-of-basis (Mixamo ↔ UE/Unity compatibility).
• Automatically maps bone names via normalization rules and custom dictionaries.
• Discards scale channels and non-root translation channels to avoid limb stretching.
• Supports posture adjustments (arm and leg spreads, custom per-bone offsets) directly in the configuration section of the script.
• Cleans up and prunes redundant animation meshes/skins, compresses the output using Draco + resampling, and generates a text file listing all merged animations.
• RUN: node merge_animations.mjs --character <character_path> --animations <animations_path> --output <output_path>
  • Command line flags:
    • -c or --character: Target character GLB path (default: _input/character.glb)
    • -a or --animations: Source animation GLB path (default: _input/animations.glb)
    • -o or --output: Output GLB path (default: _output/character_combined.glb)
  • Output files:
    • Combined GLB file: _output/character_combined.glb
    • Animation list text file: _output/character_combined_animations.txt

This APP uses FBX2GLTF Library: https://www.npmjs.com/package/fbx2gltf

and GLTF-Transform: https://gltf-transform.dev/