Category: gltf-transform

  • .fbx – .glb – compression

    # 1. Rename all files to replace spaces with underscores and lowercase them
for f in *' '*.fbx *' '*.fbm; do
    [ -e "$f" ] || continue
    new_name=$(echo "$f" | tr '[:upper:]' '[:lower:]' | tr ' ' '_')
    mv "$f" "$new_name"
done

# 2. Convert all raw .fbx files to .glb
for f in *.fbx; do
    [ -e "$f" ] || continue
    base="${f%.fbx}"
    fbx2gltf -i "$f" -b -o "${base}.glb"
done

# 3. Compress and optimize all .glb files using your pipeline
for f in *.glb; do
   [[ "$f" == *"_clean.glb" ]] && continue
   [ -e "$f" ] || continue
   
   base="${f%.glb}"
   echo "Optimizing $f to high-quality ${base}_clean.glb..."
   
   gltf-transform resize "$f" "${base}_clean.glb" --width 512 --height 512 && \
   gltf-transform prune "${base}_clean.glb" "${base}_clean.glb" && \
   gltf-transform webp "${base}_clean.glb" "${base}_clean.glb" --slots baseColor && \
   gltf-transform draco "${base}_clean.glb" "${base}_clean.glb" --quantize-position 11 --quantize-texcoord 12
done


# 2. Re-run your compression pipeline
for f in *.glb; do
   [[ "$f" == *"_clean.glb" ]] && continue
   [ -e "$f" ] || continue
   
   base="${f%.glb}"
   echo "Optimizing $f to high-quality ${base}_clean.glb..."
   
   gltf-transform resize "$f" "${base}_clean.glb" --width 512 --height 512 && \
   gltf-transform prune "${base}_clean.glb" "${base}_clean.glb" && \
   gltf-transform webp "${base}_clean.glb" "${base}_clean.glb" --slots baseColor && \
   gltf-transform draco "${base}_clean.glb" "${base}_clean.glb" --quantize-position 11 --quantize-texcoord 12
done


# 3. delete all beside _clean.glb

shopt -s extglob && rm -rf !(*_clean.glb)

  • gltf-transform –width 256 –height 256

    batch

    for f in *.fbx; do
  base="${f%.fbx}"
  
  # 1. Convert FBX to a temporary GLB
  fbx2gltf -i "$f" -o "${base}_raw.glb"
  
  # 2. Complete optimization pipeline: Resize textures, clear empty animations, apply Draco
  gltf-transform resize "${base}_raw.glb" "${base}.glb" --width 512 --height 512 && \
  gltf-transform draco "${base}.glb" "${base}.glb" --quantizePosition 10 --quantizeTexcoord 10
  
  # 3. Clean up the large intermediate file
  rm "${base}_raw.glb"
done

    This updated command downscales all textures to 256×256 pixels and combines geometry quantization with animation thinning. This pipeline will maximize your file savings, likely bringing your 25 MB models down to under 1.5 MB each.

    Run this loop in your Debian terminal:

    bash

    for f in *.fbx; do
  base="${f%.fbx}"
  
  # 1. Convert FBX to a raw GLB
  fbx2gltf -i "$f" -o "${base}_raw.glb"
  
  # 2. Resize textures to 256x256, prune empty elements, and aggressively compress geometry
  gltf-transform resize "${base}_raw.glb" "${base}.glb" --width 256 --height 256 && \
  gltf-transform prune "${base}.glb" "${base}.glb" && \
  gltf-transform draco "${base}.glb" "${base}.glb" --quantizePosition 10 --quantizeTexcoord 10 --quantizeNormal 8
  
  # 3. Remove the heavy source file
  rm "${base}_raw.glb"
done

    Use code with caution.

    What makes this code compress so aggressively?

    • resize --width 256 --height 256: Shrinks texture memory overhead by up to 98% compared to standard Mixamo 2K textures.
    • prune: This automatically detects and removes unused nodes, empty animations (like that dead Take 001 track in your log), and duplicate materials.
    • --quantizeNormal 8: Adds normal vector quantization to the Draco step, stripping extra floating-point precision data from the model’s lighting data where the human eye won’t notice it.

    Let me know what your final file sizes look like after running this loop! If they are still too large, we can add animation sampling reduction to strip out heavy keyframes, or switch the texture format to KTX2. Would you like to check the final sizes first?

  • gltf-transform : FBX Draco-compress glb

    https://cesium.com/blog/2018/04/09/draco-compression
    https://cesium.com/blog/2018/04/09/draco-compression

    https://www.mixamo.com

    To compress run_output.glb (and your other generated GLB files), you can apply Draco mesh compression and animation resampling directly from your Debian terminal.

    Step 1: Compress the File You Just Created

    Run @gltf-transform/cli directly on run_output.glb:

    Bash

    gltf-transform draco run_output.glb run_compressed.glb

    To verify the file size reduction, check the before and after sizes:

    Bash

    ls -lh run_output.glb run_compressed.glb

    Step 2: Compress Animation Keyframes (Optional)

    Draco compresses 3D geometry (vertices, normals, UVs), but Mixamo animations often contain thousands of redundant keyframe tracks. To compress the animation keyframe data as well, run resample:

    Bash

    gltf-transform resample run_compressed.glb run_final.glb

    Step 3: Compress All FBX Files in Your Folder at Once

    To convert and Draco-compress every .fbx file in your battle directory in a single loop, run:

    Bash

    for f in *.fbx; do
  fbx2gltf -i "$f" -o "${f%.fbx}.glb"
  gltf-transform draco "${f%.fbx}.glb" "${f%.fbx}_compressed.glb"
  rm "${f%.fbx}.glb"
done

    This will produce optimized _compressed.glb versions of all your animations.