gltf-pipeline
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Upgrade KHR_materials_common to PBR
Convert KHR_materials_common glTF 1.0 extension properties to PBR in updateVersion.
CC #330
https://github.com/AnalyticalGraphicsInc/gltf-pipeline/issues/428 has an example model for testing.
The conversion in obj2gltf: convertTraditionalToMetallicRoughness and the PR discussion might serve as a reference for implementing this.