private object GetDefaultAssetPropertyValue(DefaultAsset asset)
{
if (asset == null) return null;
var assetPath = AssetDatabase.GetAssetPath(asset);
if (String.IsNullOrEmpty(assetPath)) return null;
var assetName = Path.GetFileName(assetPath);
var outputPath = Path.Combine(babylonScene.OutputPath, assetName);
File.Copy(assetPath, outputPath, true);
Dictionary<string, object> assetInfo = new Dictionary<string, object>();
assetInfo.Add("type", asset.GetType().FullName);
assetInfo.Add("filename", assetName);
return assetInfo;
}