diff --git a/thermion_dart/lib/thermion_dart/viewer/thermion_viewer_base.dart b/thermion_dart/lib/thermion_dart/viewer/thermion_viewer_base.dart
index d0419f58..388d91eb 100644
--- a/thermion_dart/lib/thermion_dart/viewer/thermion_viewer_base.dart
+++ b/thermion_dart/lib/thermion_dart/viewer/thermion_viewer_base.dart
@@ -599,6 +599,12 @@ abstract class ThermionViewer {
   Future setMaterialPropertyInt(ThermionEntity entity, String propertyName,
       int materialIndex, int value);
 
+  ///
+  /// Sets the depthWrite material instance at [materialIndex] for [entity] to [enabled].
+  /// [entity] must have a Renderable attached.
+  ///
+  Future setMaterialDepthWrite(ThermionEntity entity, int materialIndex, bool enabled);
+
   ///
   /// Scale [entity] to fit within the unit cube.
   ///