用gltf-pipeline对gltf模型进行压缩
gltf-pipeline地址gltf-pipeline
操作方法：
Getting Started
Install Node.js if you don’t already have it, and then:
npm install -g gltf-pipeline
Using gltf-pipeline as a command-line tool:
Converting a glTF to glb
gltf-pipeline -i model.gltf -o model.glb
gltf-pipeline -i model.gltf -b
Converting a glb to glTF
gltf-pipeline -i model.glb -o model.gltf
gltf-pipeline -i model.glb -j
Converting a glTF to Draco glTF
gltf-pipeline -i model.gltf -o modelDraco.gltf -d
Saving separate textures
gltf-pipeline -i model.gltf -t**