diff --git a/thermion_dart/lib/src/viewer/src/thermion_viewer_base.dart b/thermion_dart/lib/src/viewer/src/thermion_viewer_base.dart
index a6528a10..20b66672 100644
--- a/thermion_dart/lib/src/viewer/src/thermion_viewer_base.dart
+++ b/thermion_dart/lib/src/viewer/src/thermion_viewer_base.dart
@@ -765,8 +765,8 @@ abstract class ThermionViewer {
   ///
   ///
   ///
-  Future showGridOverlay();
-  
+  Future showGridOverlay({covariant Material? material});
+
   ///
   ///
   ///
@@ -788,6 +788,11 @@ abstract class ThermionViewer {
   ///
   Future destroyTexture(covariant ThermionTexture texture);
 
+  ///
+  ///
+  ///
+  Future<Material> createMaterial(Uint8List data);
+
   ///
   ///
   ///