REQUIRED. A plain JSON object, where each key corresponds to a mesh attribute semantic and each value is the index of the accessor containing attribute’s data.
The index of the accessor that contains the vertex indices.
The index of the material to apply to this primitive when rendering.
The topology type of primitives to render. One of TINYGLTF_MODE_***
An array of morph targets. Each target is an associative array with attributes in ["POSITION, "NORMAL", "TANGENT"] pointing to their corresponding accessors.
Geometry to be rendered with the given material.