importGltf function

void importGltf(String inputGltfFilePath, String outputModelFilePath, { String? workingDirectory, })

Converts a single glTF binary at inputGltfFilePath to a Flutter Scene .model file at outputModelFilePath.

Both paths can be relative; they are resolved against workingDirectory (defaulting to the caller's current working directory). The dart run flutter_scene_importer:import CLI is a thin wrapper around this function.

Pure Dart — does not depend on any native binary. Output is structurally equivalent to what the previous C++ importer produced (same fb.SceneT shape, same packed vertex/index bytes, same texture dimensions).

Implementation

void importGltf(
  String inputGltfFilePath,
  String outputModelFilePath, {
  String? workingDirectory,
}) {
  // Parse paths via Uri so Windows-style paths round-trip correctly.
  final inputGltfFilePathUri = Uri.file(inputGltfFilePath);
  final outputModelFilePathUri = Uri.file(outputModelFilePath);
  // Default to the caller's CWD when no working directory is supplied, so
  // command-line invocations like `dart run flutter_scene_importer:import`
  // resolve input/output paths relative to where the user ran the command.
  final workingDirectoryUri = Uri.directory(
    workingDirectory ?? Directory.current.path,
  );
  inputGltfFilePath =
      workingDirectoryUri.resolveUri(inputGltfFilePathUri).toFilePath();
  outputModelFilePath =
      workingDirectoryUri.resolveUri(outputModelFilePathUri).toFilePath();

  final inputBytes = File(inputGltfFilePath).readAsBytesSync();
  final container = parseGlb(inputBytes);
  final doc = parseGltfJson(container.json);
  final outputBytes = emitModel(doc, container.binaryChunk);
  final outputFile = File(outputModelFilePath);
  outputFile.parent.createSync(recursive: true);
  outputFile.writeAsBytesSync(outputBytes);
}