BinaryFbxExporter.cs

namespace AteChan.co
{
    using Autodesk.Fbx;
    using UnityEditor;

    internal static class BinaryFbxExporter
    {
        [MenuItem("Tools/Convert FBX To Binary")]
        private static void ConvertToBinary()
        {
            using var manager = FbxManager.Create();
            using var importer = FbxImporter.Create(manager, string.Empty);

            var path = AssetDatabase.GetAssetPath(Selection.activeObject);
            importer.Initialize(path);

            using var document = importer.GetScene() ?? FbxDocument.Create(manager, string.Empty);
            importer.Import(document);

            using var exporter = FbxExporter.Create(manager, string.Empty);
            using var registry = manager.GetIOPluginRegistry();

            var destination = AssetDatabase.GenerateUniqueAssetPath(path);
            var format = registry.FindWriterIDByDescription("FBX binary (*.fbx)");

            exporter.Initialize(destination, format);
            exporter.Export(document);

            AssetDatabase.ImportAsset(destination);
            var instanceID = UnityEditor.Search.SearchUtils.GetMainAssetInstanceID(destination);
            EditorGUIUtility.PingObject(instanceID);
        }
    }
}