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OBJ (or .OBJ) is a geometry definition file format first developed by Wavefront Technologies for its Advanced Visualizer animation package. The file format is open and has been adopted by other 3D graphics application vendors.
The OBJ file format is a simple specify the order of the vertices which build a polyline.
Other geometry formats[edit]
Obj files support higher-order surfaces using several different kinds of interpolation, such as Taylor and B-splines, although support for those features in third party file readers is far from universal. Obj files also do not support mesh hierarchies or any kind of animation or deformation, such as vertex skinning or mesh morphing.
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Referencing materials[edit]
Materials that describe the visual aspects of the polygons are stored inexternal .mtl files. More than one external MTL material file may be referenced from within the OBJ file. The .mtl file may contain one or more named material definitions.
Obj Mtl File Download
This tag specifies the material name for the element following it. The material name matches a named material definition in an external .mtl file.
Named objects and polygon groups are specified via the following tags.
Smooth shading across polygons is enabled by smoothing groups.
Relative and absolute indices[edit]
OBJ files, due to their list structure, are able to reference vertices, normals, etc. either by their absolute position (1 represents the first defined vertex, N representing the Nth defined vertex), or by their relative position (-1 represents the latest defined vertex). However, not all software supports the latter approach, and conversely some software inherently writes only the latter form (due to the convenience of appending elements without needing to recalculate vertex offsets, etc.), leading to occasional incompatibilities.
Material template library[edit]
The Material Template Library format (MTL) or .MTL File Format is a companion file format to .OBJ, also defined by Wavefront Technologies, that describes surface shading (material) properties of objects within one or more .OBJ files. A .OBJ file references one or more .MTL files (called 'material libraries'), and from there, references one or more material descriptions by name. .MTL files are ASCII text that define the light reflecting properties of a surface for the purposes of computer rendering, and according to the Phong reflection model. The standard has widespread support among different computer software packages, making it a useful format for interchange of materials.
The MTL format, although still widely used, is outdated and does not fully support later technologies such as specular maps and parallax maps. However, due to the open and intuitive nature of the format, these can easily be added with a custom MTL file generator.
The MTL format defines a number of formats.[2][3]
Basic materials[edit]
A single
.mtl file may define multiple materials. Materials are defined one after another in the file, each starting with the newmtl command:
The ambient color of the material is declared using
Ka . Color definitions are in RGB where each channel's value is between 0 and 1.
Similarly, the diffuse color is declared using
Kd .
The specular color is declared using
Ks , and weighted using the specular exponentNs .
Materials can be transparent. This is referred to as being dissolved. Unlike real transparency, the result does not depend upon the thickness of the object. A value of 1.0 for 'd' is the default and means fully opaque, as does a value of 0.0 for 'Tr'.
Multiple illumination models are available, per material. These are enumerated as follows:
Texture maps[edit]
Textured materials use the same properties as above, and additionally define texture maps. Below is an example of a common material file. See the full wavefront file format reference for more details.
Texture map statements may also have option parameters (see full spec).
Texture options[edit]
For reflection maps..
Vendor specific alterations[edit]
Because of the ease in parsing the files, and the unofficial spreading of the file format, files may contain vendor specific alterations.
According to the spec, options are supposed to precede the texture filename. However, at least one vendor generates files with options at the end.
Physically-based Rendering[edit]
The creators of the online 3D editing and modeling tool, Clara.io, proposed extending the MTL format to contain the following parameters to represent the physically-based rendering parameters:[4]
Further proposed extensions come from the DirectXMesh toolkit for Microsoft's DirectX engine, allowing the ability to define a model's pre-compiled RMA material.[5]
See also[edit]
References[edit]
External links[edit]
Retrieved from 'https://en.wikipedia.org/w/index.php?title=Wavefront_.obj_file&oldid=910272627'
OBJ File Summary![]()
D link dwl-g520 driver download windows xp. Our most recent information indicates that OBJ files are associated with only a single known file type, the Wavefront 3D Object File format, and can be viewed primarily with Autodesk AutoCAD Ecscad, including ten other known software applications (listed below). OBJ files are traditionally categorized as 3D Image Files.
File Extension OBJ files have been identified on both desktop and mobile devices. They are fully or partially supported by Windows, Mac, and Linux. The main OBJ file type has a Popularity Rating of 'Low', meaning these files are not frequently present on your typical desktop or mobile device.
If you would like to learn more about OBJ files and the software that opens them, please see the additional detailed information below. Also, you can learn how to do some basic OBJ file troubleshooting if you are having trouble opening these files.
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