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ToolModel Voxelizer
A client-side 3D model voxelizer using CPU-based spatial tree raycasting.
Model Voxelizer converts 3D GLTF and GLB models into volumetric voxel structures entirely within your browser. By building an on-the-fly Bounding Volume Hierarchy (BVH) spatial tree, it casts ray grids from six directions around the model's bounding box to construct a gapless, solid voxel shell.
The tool maps colors directly from your model's texture files using precise barycentric coordinate mapping. To create clean, unified retro designs, you can enable Advanced Color Merging to group similar shades into a dominant color palette. Choose from classic cubes, lego bricks, or connected architectural column designs, and export your final voxel art to PNG snapshots, standard OBJ meshes with vertex colors, MagicaVoxel VOX structures, or fully textured GLB 3D files.
Features
CPU-bound Bounding Volume Hierarchy: Instant, client-side spatial tree construction without external dependency overhead.
Outside-In Raycast Grids: Multi-directional grid casting ensures gapless, solid voxel shell generation.
Barycentric Texture Mapping: Pulls color information directly from complex model textures for realistic voxel skinning.
Advanced Color Clustering: Filters and groups model colors into a clean palette with adjustable strictness thresholds.
Modular Mesh Geometry: Instantly swaps between standard cubes, detailed lego studs, and connected columns.
How to use
1. Upload: Go to the Model tab and click the upload area to load a GLB or GLTF model. 2. Grid: Use the Voxel Grid Resolution slider to adjust block sizes (HD detail vs blocky retro). Choose a voxel shape style (Cube, Lego, Column). 3. Color: Tweak colors in the Colors tab. Turn on 'Advanced Color Merging' to identify dominant colors, and adjust strictness sliders to group similar shades. 4. View: Toggle 'Show Original Overlay' to compare the voxelized mesh with the original GLTF design. 5. Export: Click the Export button in the top right toolbar to save your work as a PNG snapshot, OBJ mesh, MagicaVoxel VOX file, or GLB asset.
Use cases
- Converting complex 3D meshes into block-based voxel game assets
- Generating stylized lego or pillar art from architectural 3D models
- Extracting clean, clustered retro color palettes from organic textures
- Learning ray/triangle intersections and bounding box hierarchy concepts interactively
FAQ
Why does high resolution take longer to compute?
Voxelizing a model requires casting thousands of rays through the spatial BVH tree. High resolutions (smaller voxel sizes) generate exponentially more rays, but the tool processes these in chunks asynchronously to keep your browser responsive.
What files can I upload?
You can upload standard binary GLB or JSON GLTF files. Make sure the file contains valid mesh geometries and embedded textures or colors.
What export formats are supported?
Model Voxelizer supports exporting to high-res PNG snapshots, standard Wavefront OBJ files (with vertex colors, separate blocks), MagicaVoxel VOX files (compatible with standard voxel editors), and glTF binary GLB models (fully compatible with Blender, Unity, and Unreal Engine).
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