public static void AddExtensionUsed(this Gltf gltf, string name)
{
if (gltf.ExtensionsUsed == null)
{
gltf.ExtensionsUsed = new List <string>();
}
if (gltf.ContainsExtensionUsed(name))
{
return;
}
gltf.ExtensionsUsed.Add(name);
}
