3 index buffers

Question

So, in both D3D and OpenGL there\'s ability to draw from an index buffer.

The OBJ file format however does something weird. It specifies a bunch of vertices like:

Answer 1

OBJ was not designed to map to OpenGL or DirectX.

Everything you said is true, and no, it's not possible to use per-attribute indices.

You have to convert the OBJ representation to something that only uses a single index per vertex (possibly duplicating some vertex data along the way).