# Wikipedia Authors - Wavefront .obj file (Highlights) ![rw-book-cover|256](https://readwise-assets.s3.amazonaws.com/static/images/article4.6bc1851654a0.png) ## Highlights - If an index is positive then it refers to the offset in that vertex list, starting at 1. If an index is negative then it relatively refers to the end of the vertex list, -1 referring to the last element. ([View Highlight](https://read.readwise.io/read/01ja5f8gghpf10fraz07nzv6ah)) ^798465255 #caveat