OBJ coordinates have no units, but OBJ files can contain scale information in a human-readable comment line. Vertices are stored in a counter-clockwise order by default, making explicit declaration of face normals unnecessary. The OBJ file format is a simple data format that represents 3D geometry alone - namely, the position of each vertex, the UV position of each texture coordinate vertex, vertex normals, and the faces that make each polygon defined as a list of vertices, and texture vertices.
The next bytes are the chunk's data, followed by the sub-chunks, in a structure that may extend to several levels deep. The next four bytes contain a little-endian integer that is the length of the chunk, including its data, the length of its sub-blocks, and the 6-byte header. The parser can identify the chunk from that value and decide whether it will parse it or skip it. The first two bytes of the chunk are its ID. The chunks form a hierarchical structure, similar to an XML DOM tree. This allows parsers to skip chunks they don't recognize and allows for extensions to the format. The format is based on chunks, where each section of data is embedded in a block containing a chunk identifier and the length of the data and the data itself. The file format is open and has been adopted by other 3D graphics application vendors.ģds is a binary file format. obj) is a geometry definition file format first developed by Wavefront Technologies for its Advanced Visualizer animation package. While the 3DS format aims to provide an import/export format, retaining only essential geometry, texture, and lighting data, the related MAX format also contains extra information specific to Autodesk 3ds Max to allow a scene to be completely saved/loaded.
Since 1990, it has grown to become a de facto industry standard for transferring models between 3D programs or storing models for 3D resource catalogs. It was the native file format of the old Autodesk 3D Studio DOS, which was popular until its successor replaced it in April 1996. 3DS is one of the file formats used by the Autodesk 3ds Max 3D modeling, animation, and rendering software.
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