[TOC]

参考

• Wavefront .obj file - 维基百科

  • 推荐看英文版

• OBJ Spec

• 翻译 Warefront Object File （.obj）文档

  • 翻译的质量不是很好，看起来像是直译，不过可以参考

介绍

OBJ (or .OBJ)是Wavefront公司开发的3D几何定义文件。包含每个顶点的位置、纹理坐标和UV坐标、
法线等。

顶点坐标逆时针定义，所以无需法线定义。

文件格式

# this is a comment

  # List of geometric vertices, with (x, y, z [,w]) coordinates, w is optional and defaults to 1.0.
  v 0.123 0.234 0.345 1.0
  v ...
  ...
  # List of texture coordinates, in (u, [,v ,w]) coordinates, these will vary between 0 and 1. v, w are optional and default to 0.
  vt 0.500 1 [0]
  vt ...
  ...
  # List of vertex normals in (x,y,z) form; normals might not be unit vectors.
  vn 0.707 0.000 0.707
  vn ...
  ...
  # Parameter space vertices in ( u [,v] [,w] ) form; free form geometry statement ( see below )
  vp 0.310000 3.210000 2.100000
  vp ...
  ...
  # Polygonal face element (see below)
  f 1 2 3
  f 3/1 4/2 5/3
  f 6/4/1 3/5/3 7/6/5
  f 7//1 8//2 9//3
  f ...
  ...
  # Line element (see below)
  l 5 8 1 2 4 9

MTL