OBJFormat
OBJFormat, commonly referred to as the Wavefront OBJ format, is a plain-text file format used to describe 3D geometry for interchange between graphics software. Originating from Wavefront Technologies in the 1980s, it provides a simple, human-readable representation of vertices, texture coordinates, vertex normals, and polygonal faces. An OBJFormat file consists of a series of lines, each starting with an identifier such as v, vt, vn, vp, f, g, o, or usemtl. Vertex lines define positions as v x y z; texture coordinates as vt u [v] [w]; and vertex normals as vn x y z. Faces are defined with f lines that reference vertex indices and may optionally include texture and normal indices in the form v1/vt1/vn1 v2/vt2/vn2 ... The format supports multiple objects and groups via o and g, and materials through mtllib and usemtl, with materials defined in a separate MTL file. Smoothing groups can be indicated with s.
OBJFormat favors simplicity and broad compatibility, making it a common interchange format for 3D models. It