diff --git a/thermion_dart/lib/src/viewer/src/shared_types/material.dart b/thermion_dart/lib/src/viewer/src/shared_types/material.dart
index 8fad022a..95bdf568 100644
--- a/thermion_dart/lib/src/viewer/src/shared_types/material.dart
+++ b/thermion_dart/lib/src/viewer/src/shared_types/material.dart
@@ -1,6 +1,7 @@
 abstract class MaterialInstance {
   Future setDepthWriteEnabled(bool enabled);
   Future setDepthCullingEnabled(bool enabled);
+  Future setParameterFloat2(String name, double x, double y);
 }
 
 enum AlphaMode { OPAQUE, MASK, BLEND }