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The AO baking procedure consists of the following steps: 1. Flatten the glTF hierarchy. 2. Generate a single 2D parameterization for the entire scene. 3. Embree Pass 1: Create G-Buffer using the above UVs as vert positions. 4. Embree Pass 2: Cast rays from the positions embedded in the G-Buffer. The `gltf_baker` tool is not ready for general use but already produces reasonable results for certain well-formed models.