OBJ2GLTF

Convert OBJ assets to glTF 1.0.

Getting Started

Install Node.js if you don't already have it, and then:

npm install --save obj2gltf

Using obj2gltf as a library:

var obj2gltf = require('obj2gltf');
var options = {
    separateTextures : true // Don't embed textures in the converted glTF
}
obj2gltf('model.obj', 'model.gltf', options)
    .then(function() {
        console.log('Converted model');
    });

Using obj2gltf as a command-line tool:

node bin/obj2gltf.js -i model.obj

node bin/obj2gltf.js -i model.obj -o model.gltf

Usage

Command line flags:

Flag	Description	Required
-h, --help	Display help.	No
-i, --input	Path to the obj file.	✅ Yes
-o, --output	Path of the converted glTF file.	No
-b, --binary	Save as binary glTF.	No, default false
-s, --separate	Writes out separate geometry data files, shader files, and textures instead of embedding them in the glTF file.	No, default false
-t, --separateTextures	Write out separate textures only.	No, default false
-c, --compress	Quantize positions, compress texture coordinates, and oct-encode normals.	No, default false
-z, --optimize	Use the optimization stages in the glTF pipeline.	No, default false
-n, --generateNormals	Generate normals if they are missing.	No, default false
--optimizeForCesium	Optimize the glTF for Cesium by using the sun as a default light source.	No, default false
--ao	Apply ambient occlusion to the converted model.	No, default false
--bypassPipeline	Bypass the gltf-pipeline for debugging purposes. This option overrides many of the options above.	No, default false
--checkTransparency	Do a more exhaustive check for texture transparency by looking at the alpha channel of each pixel. By default textures are considered to be opaque.	No, default false
--secure	Prevent the converter from reading image or mtl files outside of the input obj directory.	No, default false
--inputUpAxis	Up axis of the obj. Choices are 'X', 'Y', and 'Z'.	No, default Y
--outputUpAxis	Up axis of the converted glTF. Choices are 'X', 'Y', and 'Z'.	No, default Y
--packOcclusion	Pack the occlusion texture in the red channel of metallic-roughness texture.	No, default false
--metallicRoughness	The values in the mtl file are already metallic-roughness PBR values and no conversion step should be applied. Metallic is stored in the Ks and map_Ks slots and roughness is stored in the Ns and map_Ns slots.	No, default false
--specularGlossiness	The values in the mtl file are already specular-glossiness PBR values and no conversion step should be applied. Specular is stored in the Ks and map_Ks slots and glossiness is stored in the Ns and map_Ns slots. The glTF will be saved with the KHR_materials_pbrSpecularGlossiness extension.	No, default false
--materialsCommon	The glTF will be saved with the KHR_materials_common extension.	No, default false

Build Instructions

Run the tests:

npm run test

To run ESLint on the entire codebase, run:

npm run eslint

To run ESLint automatically when a file is saved, run the following and leave it open in a console window:

npm run eslint-watch

Running Test Coverage

Coverage uses nyc. Run:

npm run coverage

For complete coverage details, open coverage/lcov-report/index.html.

The tests and coverage covers the Node.js module; it does not cover the command-line interface, which is tiny.

Generating Documentation

To generate the documentation:

npm run jsdoc

The documentation will be placed in the doc folder.

Debugging

• To debug the tests in Webstorm, open the Gulp tab, right click the test task, and click Debug 'test'.
• To run a single test, change the test function from it to fit.

Contributions

Pull requests are appreciated. Please use the same Contributor License Agreement (CLA) used for Cesium.

---

Developed by the Cesium team.