glTF Pipeline

Content pipeline tools for optimizing glTF assets by Richard Lee and the Cesium team.

This project is under active development, see the roadmap.

gltf-pipeline can be used as a command-line tool or Node.js module.

Instructions

Clone this repo and install Node.js. From the root directory of this repo, run:

npm install

Command-Line Example:

node ./bin/gltf-pipeline.js ./specs/data/boxTexturedUnoptimized/CesiumTexturedBoxTest.gltf -o output.gltf

Command-Line Flags

Flag	Description	Required
-i, --input	Path to the input glTF file.	✅ Yes
-o, --output	Directory or filename for the exported glTF file.	No
-b, --binary	Write binary glTF file.	No, default false
-s, --separate	Writes out separate geometry/animation data files, shader files and textures instead of embedding them in the glTF file.	No, default false
-h, --help	Display help	No
-t, --separateTexture	Write out separate textures, but embed geometry/animation data files, and shader files.	No, default false
-q, --quantize	Quantize attributes using WEB3D_quantized_attributes extension.	No, default false
-n, --encodeNormals	Oct-encode the normals of this model.	No, default false
-c, --compressTextureCoordinates	Compress the texture coordinates of this model.	No, default false
--ao	Bake ambient occlusion to vertex data using default settings only. When specifying other settings, do not use --ao on its own. Advanced settings in lib/bakeAmbientOcclusion.js	No, default false
--ao.toTexture	Bake AO to existing diffuse textures instead of to vertices. Does not modify shaders.	No, default false
--ao.groundPlane	Simulate a groundplane at the lowest point of the model when baking AO.	No, default false
--ao.ambientShadowContribution	Amount of AO to show when blending between shader computed lighting and AO. 1.0 is full AO, 0.5 is a 50/50 blend.	No, default 0.5
--ao.quality	Valid settings are high, medium, and low.	No, default low

Build Instructions

Run the tests:

npm run test

To run JSHint on the entire codebase, run:

npm run jsHint

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

npm run jsHint-watch

Running Test Coverage

Coverage uses istanbul. 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) and Coding Guide used for Cesium.

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