java-cpu-voxelizer

Tiny CLI to voxelize a GLB mesh on CPU and emit the same files your CUDA tool produces:

• name_128.json — { "blocks": { "1":[255,255,255] }, "xyzi":[[x,y,z,1], ...] }
• name_position.json — [ { "translation":[ox,oy,oz], "origin":[0,0,0] } ]

Uses a solid triangle voxelizer with the hard-coded 3D Tiles cube (46×38×24 scaled by 1.3).

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Requirements

• JDK 17+
• Maven 3.8+

(On Windows/WSL: build in the project directory; running from WSL is fine.)

Build

mvn -q -DskipTests clean package

Build artifact: target/voxelizer-cli-1.0.0-all.jar

Usage

# basic
java -jar target/voxelizer-cli-1.0.0-all.jar \
  -f /path/to/tile.glb -s 128 -o out -3dtiles -v

# multiple files
java -jar target/voxelizer-cli-1.0.0-all.jar \
  -f a.glb -f b.glb -f c.glb -s 128 -o out -3dtiles

# from a list (one GLB path per line)
java -jar target/voxelizer-cli-1.0.0-all.jar \
  -filelist tiles.txt -s 128 -o out --no-3dtiles

Options

• -f <path>  Add a GLB file (repeatable)
• -filelist <txt> Text file with one GLB path per line
• -s <grid>  Grid size (default 128)
• -o <dir>  Output directory (default ./out)
• -3dtiles / --no-3dtiles Enable/disable 3D Tiles cube bounds (default on)
• -v  Verbose logs
• -h Help

Output

For each input name.glb, you’ll get in <out>:

• name_<grid>.json
• name_position.json

Quick compare vs CUDA output

# optional: compare only geometry (ignores color palette)
jq '.xyzi | sort_by(.[0],.[1],.[2])' out_cpu/name_128.json  > cpu.xyzi.json
jq '.xyzi | sort_by(.[0],.[1],.[2])' out_cuda/name_128.json > gpu.xyzi.json
diff -u gpu.xyzi.json cpu.xyzi.json

That’s it!