diff --git a/thermion_dart/lib/src/filament/src/asset.dart b/thermion_dart/lib/src/filament/src/asset.dart
index 9658caa1..114e2e73 100644
--- a/thermion_dart/lib/src/filament/src/asset.dart
+++ b/thermion_dart/lib/src/filament/src/asset.dart
@@ -64,6 +64,13 @@ abstract class ThermionAsset {
   ///
   Future removeStencilHighlight();
 
+  ///
+  /// The dimensions of the bounding box for this asset.
+  /// This is independent of the boundingBoxAsset (which is used to visualize 
+  /// the bounding box in the scene); you do not need to call 
+  /// [createBoundingBoxAsset] before this method.
+  Future<Aabb3> getBoundingBox();
+
   ///
   /// The bounding box for this asset, as an actual renderable asset.
   /// Null by default; call [createBoundingBoxAsset] first to create.
@@ -72,9 +79,9 @@ abstract class ThermionAsset {
 
   ///
   /// Creates the renderable bounding box for this asset.
-  /// This is safe to call multiple times; if [boundingBoxAsset] is non-null, 
+  /// This is safe to call multiple times; if [boundingBoxAsset] is non-null,
   /// this will simply return the existing bounding box asset.
-  /// 
+  ///
   /// You will still need to call [Scene.add] to add this to the scene.
   ///
   Future<ThermionAsset> createBoundingBoxAsset();
diff --git a/thermion_dart/lib/src/viewer/src/ffi/src/background_image.dart b/thermion_dart/lib/src/viewer/src/ffi/src/background_image.dart
index ee48f7f7..8a16403b 100644
--- a/thermion_dart/lib/src/viewer/src/ffi/src/background_image.dart
+++ b/thermion_dart/lib/src/viewer/src/ffi/src/background_image.dart
@@ -1,5 +1,5 @@
 import 'dart:typed_data';
-
+import 'package:vector_math/vector_math_64.dart' as v64;
 import 'package:animation_tools_dart/src/bone_animation_data.dart';
 import 'package:animation_tools_dart/src/morph_animation_data.dart';
 import 'package:thermion_dart/src/filament/src/layers.dart';
@@ -63,7 +63,7 @@ class BackgroundImage extends ThermionAsset {
     await mi.setParameterFloat4("backgroundColor", r, g, b, a);
   }
 
-  Future hideImage() async { 
+  Future hideImage() async {
     await mi.setParameterInt("showImage", 0);
   }
 
@@ -336,18 +336,21 @@ class BackgroundImage extends ThermionAsset {
     // TODO: implement transformToUnitCube
     throw UnimplementedError();
   }
-  
+
   @override
-  Future<MaterialInstance> getMaterialInstanceAt({ThermionEntity? entity, int index = 0}) {
-    // TODO: implement getMaterialInstanceAt
+  Future<MaterialInstance> getMaterialInstanceAt(
+      {ThermionEntity? entity, int index = 0}) {
     throw UnimplementedError();
   }
-  
+
   ThermionAsset? get boundingBoxAsset => throw UnimplementedError();
-  
+
   @override
   Future<ThermionAsset> createBoundingBoxAsset() {
-    // TODO: implement getBoundingBoxAsset
+    throw UnimplementedError();
+  }
+
+  Future<v64.Aabb3> getBoundingBox() {
     throw UnimplementedError();
   }
 }
diff --git a/thermion_dart/lib/src/viewer/src/ffi/src/ffi_asset.dart b/thermion_dart/lib/src/viewer/src/ffi/src/ffi_asset.dart
index 3cf886ad..9bc3a5b2 100644
--- a/thermion_dart/lib/src/viewer/src/ffi/src/ffi_asset.dart
+++ b/thermion_dart/lib/src/viewer/src/ffi/src/ffi_asset.dart
@@ -246,8 +246,14 @@ class FFIAsset extends ThermionAsset {
     throw UnimplementedError();
   }
 
+  ///
+  ///
+  ///
   ThermionAsset? boundingBoxAsset;
 
+  ///
+  ///
+  ///
   Future<v64.Aabb3> getBoundingBox() async {
     final entities = <ThermionEntity>[];
     if (RenderableManager_isRenderable(app.renderableManager, entity)) {