Wavefront OBJ Files
The Wavefront OBJ file format is a common format for storing and sharing 3D graphics data. Like the PPM image format that you implemented way back in Chapter 2, Drawing on a Canvas, the OBJ format is plain text, which means you can view, edit, and even create these files in any text editor, though it’s much easier to model something in a 3D modeling tool and then export it to OBJ.
The OBJ format consists of statements, each of which occupies a single line. Each statement is prefaced with a command, followed by a space-delimited list of arguments. For example, the following OBJ file defines three vertices (v), and a triangle (f, for “face”) that references those vertices.
| | v 1.5 2 1.3 |
| | v 1.4 -1.2 0.12 |
| | v -0.1 0 -1.3 |
| |
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