====== GLTF ======

  * blender has built-in GLTF support

  * GLTF format
    * when exporting GLTF: it will create .bin file for geo data, .gltf for scene structure description, tex folder for textures
    * it is good for you want to replace texture later on, or just manual edit texture source path in gltf text file.
  * GLB format
    * it is basically above in one packed file called GLB.

  * related video
    * tons of gltf, 3d, web, openxr, webgl: https://www.youtube.com/@khronos
====== GLTF property ======

Material
  * clearcoat property: 
    * What is glTF Clearcoat? by The Khronos Group : https://www.youtube.com/watch?v=OwdmeayHAdQ