Real-Time 3D Graphics with WebGL 2 - Second Edition

Understanding the OBJ Format

There are several types of definitions in an OBJ file. Let's cover them line-by-line with a simple example. We are going to dissect a sample square.obj file that we will export from the Blender file called square.blend. This file represents a square divided into two parts, one painted red and the other painted blue, as shown in the following diagram:

When we export Blender models to an OBJ format, the resulting file normally starts with a comment:

# Blender v2.62 (sub 0) OBJFile: 'squares.blend'# www.blender.org

These are comments, and they are denoted with a hash # symbol at the beginning of the line.

Next, we ...