3D file formats

OBJ face index resolver

Convert relative OBJ face references to absolute positive indices.

Your inputs

Start with an example

Example result

A negative reference resolves to current list count + index + 1. Vertex, UV and normal references use their own lists.

With 10 vertices, references −3, −2, −1 resolve to 8, 9, 10.

Counts must describe the file position before the face. Indices start at one; zero and out-of-range references are rejected.