When using custom shaders provided within a glTF file [page:THREE.GLTFLoader.Shaders] should be updated on each render loop. See [example:webgl_loader_gltf] demo source code for example usage.
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This class is often used with [page:THREE.GLTFLoader.Animations THREE.GLTFLoader.Animations] to animate parsed animations. See [example:webgl_loader_gltf] demo source code for example usage.