Convert .obj models to Minecraft schematics using CUDA acceleration. Outputs a Sponge V3 format schematic.

Loads your .obj and material files, then rasterizes the mesh into a voxel grid on the GPU. Each voxel samples the model's texture and gets matched to the closest Minecraft block by average color. The result gets written as a .schem file that you can import into WorldEdit.

Car	Teapot	Ibuki

• NVIDIA GPU with CUDA support
• CUDA Toolkit
• CMake 3.18+
• C++17 compiler
• zlib

git clone https://github.com/Briiqn/obj2schem.git
cd obj2schem
mkdir build && cd build
cmake ..
cmake --build . --config Release

The binary will be in the build/ directory.

./obj2schem <input.obj> <output.schem> [scale] [textures_dir] [mode]

• <input.obj> - your model file
• <output.schem> - where to save the schematic
• [scale] - longest axis in blocks (defaults to 100)
• [textures_dir] - block textures folder (defaults to ./textures)
• [mode] - rasterization mode:
  • fast (default) - Bresenham wireframe + scanline fill
  • quality - conservative rasterization

Examples:

./obj2schem ../models/car.obj red_car.schem 250 ../textures fast
./obj2schem ../models/teapot.obj teapot.schem 150 ../textures quality

fast: Uses 3D Bresenham for edge drawing and scanline filling. Faster but you may have directional bias and small gaps.

quality: Conservative rasterization tests every voxel in triangle bounding boxes. Slower but guarantees complete coverage with no holes.

The texture directory should contain pngs named after block ids (e.g., stone.png, oak_planks.png).