public override byte[] WriteGLTF()
{
var target = this._target;
var gltfJson = new MyJson_Tree();
//
var assetJson = new MyJson_Tree();
assetJson.SetInt("version", 2);
gltfJson.Add("asset", assetJson);
var materialsJson = new MyJson_Array();
gltfJson.Add("materials", materialsJson);
var extensionsRequired = new MyJson_Array();
extensionsRequired.AddString("KHR_techniques_webgl");
extensionsRequired.AddString("paper");
gltfJson.Add("extensionsRequired", extensionsRequired);
var extensionsUsed = new MyJson_Array();
extensionsUsed.AddString("KHR_techniques_webgl");
extensionsUsed.AddString("paper");
gltfJson.Add("extensionsUsed", extensionsUsed);
//
gltfJson.SetInt("version", 4);
//Unifrom or Defines
var materialType = this.GetMaterialType();
var writer = MaterialWriterFactory.Create(materialType, target);
var materialItemJson = writer.Write();
materialsJson.Add(materialItemJson);
writer.Clean();
//
gltfJson.isWithFormat = true;
var jsonStr = gltfJson.ToString();
return(System.Text.Encoding.UTF8.GetBytes(jsonStr));
}