orbital.obj is an original parametric torus and sphere generated for this project by tools/generate_demo.py (Python standard library). It has positions, UVs, normals and triangle faces; no imported mesh or texture data is used. The generator and generated model use the repository's MIT license. Run python tools/generate_demo.py from any directory to reproduce the asset.

The default amber/teal checker is generated in Texture::checker(), also MIT.