diff --git a/thermion_dart/lib/thermion_dart/compatibility/web/interop/thermion_viewer_dart_bridge.dart b/thermion_dart/lib/thermion_dart/compatibility/web/interop/thermion_viewer_dart_bridge.dart
index 4878e0fa..c0687c52 100644
--- a/thermion_dart/lib/thermion_dart/compatibility/web/interop/thermion_viewer_dart_bridge.dart
+++ b/thermion_dart/lib/thermion_dart/compatibility/web/interop/thermion_viewer_dart_bridge.dart
@@ -2,6 +2,7 @@
 library thermion_flutter_js;
 
 import 'dart:js_interop';
+import 'package:logging/logging.dart';
 import 'package:thermion_dart/thermion_dart/compatibility/web/interop/thermion_viewer_js_shim.dart';
 
 import 'package:vector_math/vector_math_64.dart' as v64;
@@ -21,6 +22,7 @@ import 'package:vector_math/vector_math_64.dart';
 ///
 @JSExport()
 class ThermionViewerJSDartBridge {
+  final _logger = Logger("ThermionViewerJSDartBridge");
   final ThermionViewer viewer;
 
   ThermionViewerJSDartBridge(this.viewer);
@@ -76,7 +78,7 @@ class ThermionViewerJSDartBridge {
 
   @JSExport()
   JSPromise loadIbl(String lightingPath, double intensity) {
-    print("Loading IBL from $lightingPath with intensity $intensity");
+    _logger.info("Loading IBL from $lightingPath with intensity $intensity");
     return viewer.loadIbl(lightingPath, intensity: intensity).toJS;
   }
 
@@ -130,12 +132,12 @@ class ThermionViewerJSDartBridge {
 
   @JSExport()
   JSPromise<JSNumber> loadGlb(String path, {int numInstances = 1}) {
-    print("Loading GLB from path $path with numInstances $numInstances");
+    _logger.info("Loading GLB from path $path with numInstances $numInstances");
     return viewer
         .loadGlb(path, numInstances: numInstances)
         .then((entity) => entity.toJS)
         .catchError((err) {
-      print("Error: $err");
+      _logger.info("Error: $err");
     }).toJS;
   }
 
@@ -253,13 +255,13 @@ class ThermionViewerJSDartBridge {
         targetMeshNames: targetMeshNamesDart,
       )
           .onError((err, st) {
-        print("ERROR SETTING MORPH ANIMATION DATA : $err\n$st");
+        _logger.severe("ERROR SETTING MORPH ANIMATION DATA : $err\n$st");
         return null;
       });
       return result.toJS;
     } catch (err, st) {
-      print(err);
-      print(st);
+      _logger.severe(err);
+      _logger.severe(st);
       rethrow;
     }
   }
@@ -618,7 +620,7 @@ class ThermionViewerJSDartBridge {
         )
         .then((entities) => entities.map((entity) => entity.toJS).toList().toJS)
         .onError((e, st) async {
-      print("Error : $e\n$st");
+      _logger.severe("Error : $e\n$st");
       return <JSNumber>[].toJS;
     }).toJS;
   }
@@ -632,7 +634,7 @@ class ThermionViewerJSDartBridge {
         )
         .then((entity) => entity.toJS)
         .onError((e, st) async {
-      print("Error getChildEntity : $e\n$st");
+      _logger.severe("Error getChildEntity : $e\n$st");
       return 0.toJS;
     }).toJS;
   }
diff --git a/thermion_dart/lib/thermion_dart/compatibility/web/interop/thermion_viewer_js.dart b/thermion_dart/lib/thermion_dart/compatibility/web/interop/thermion_viewer_js.dart
index 18acf36c..83919eb4 100644
--- a/thermion_dart/lib/thermion_dart/compatibility/web/interop/thermion_viewer_js.dart
+++ b/thermion_dart/lib/thermion_dart/compatibility/web/interop/thermion_viewer_js.dart
@@ -3,6 +3,7 @@ import 'dart:js_interop_unsafe';
 import 'dart:math';
 
 import 'package:animation_tools_dart/animation_tools_dart.dart';
+import 'package:logging/logging.dart';
 import 'package:thermion_dart/thermion_dart/scene.dart';
 import 'package:thermion_dart/thermion_dart/thermion_viewer.dart';
 
@@ -15,6 +16,7 @@ import 'thermion_viewer_js_shim.dart';
 /// a corresponding Javascript shim implementation (see [ThermionViewerJSShim]).
 ///
 class ThermionViewerJS implements ThermionViewer {
+  final _logger = Logger("ThermionViewerJS");
   late final ThermionViewerJSShim _shim;
 
   ThermionViewerJS.fromGlobalProperty(String globalPropertyName) {
@@ -282,8 +284,8 @@ class ThermionViewerJS implements ThermionViewer {
               targetMeshNamesJS, animation.frameLengthInMs)
           .toDart;
     } catch (err, st) {
-      print(err);
-      print(st);
+      _logger.severe(err);
+      _logger.severe(st);
       rethrow;
     }
   }
@@ -826,17 +828,17 @@ class ThermionViewerJS implements ThermionViewer {
   void onDispose(Future Function() callback) {
     _onDispose.add(callback);
   }
-  
+
   @override
   Future setShadowType(ShadowType shadowType) {
     return _shim.setShadowType(shadowType.index).toDart;
   }
-  
+
   @override
   Future setShadowsEnabled(bool enabled) {
     return _shim.setShadowsEnabled(enabled).toDart;
   }
-  
+
   @override
   Future setSoftShadowOptions(double penumbraScale, double penumbraRatioScale) {
     return _shim.setSoftShadowOptions(penumbraScale, penumbraRatioScale).toDart;
diff --git a/thermion_dart/lib/thermion_dart/compatibility/web/interop/thermion_viewer_wasm.dart b/thermion_dart/lib/thermion_dart/compatibility/web/interop/thermion_viewer_wasm.dart
index 7fcaec32..c27d5e40 100644
--- a/thermion_dart/lib/thermion_dart/compatibility/web/interop/thermion_viewer_wasm.dart
+++ b/thermion_dart/lib/thermion_dart/compatibility/web/interop/thermion_viewer_wasm.dart
@@ -4,6 +4,7 @@ import 'dart:js_interop_unsafe';
 import 'dart:math';
 import 'dart:typed_data' as td;
 import 'dart:typed_data';
+import 'package:logging/logging.dart';
 import 'package:thermion_dart/thermion_dart/scene.dart';
 import 'package:web/web.dart';
 import 'package:animation_tools_dart/animation_tools_dart.dart';
@@ -40,6 +41,8 @@ typedef ThermionViewerImpl = ThermionViewerWasm;
 /// (Emscripten-generated) ThermionDart JS module.
 ///
 class ThermionViewerWasm implements ThermionViewer {
+  final _logger = Logger("ThermionViewerWasm");
+
   late _EmscriptenModule _module;
 
   bool _initialized = false;
@@ -812,7 +815,7 @@ class ThermionViewerWasm implements ThermionViewer {
       var meshEntity = meshEntities[i];
 
       if (targetMeshNames?.contains(meshName) == false) {
-        // print("Skipping $meshName, not contained in target");
+        // _logger.info("Skipping $meshName, not contained in target");
         continue;
       }
 
@@ -820,7 +823,7 @@ class ThermionViewerWasm implements ThermionViewer {
 
       var meshMorphTargets = await getMorphTargetNames(entity, meshEntity);
 
-      print("Got mesh morph targets ${meshMorphTargets}");
+      _logger.info("Got mesh morph targets ${meshMorphTargets}");
 
       var intersection = animation.morphTargets
           .toSet()
@@ -862,35 +865,42 @@ class ThermionViewerWasm implements ThermionViewer {
       // Copy the morph indices to WASM
       _module.writeArrayToMemory(
           idxList.buffer.asUint8List(idxList.offsetInBytes).toJS, idxPtr);
-
-      var result = _module.ccall(
-          "set_morph_animation",
-          "bool",
-          [
-            "void*".toJS,
-            "int".toJS,
-            "float*".toJS,
-            "int*".toJS,
-            "int".toJS,
-            "int".toJS,
-            "float".toJS
-          ].toJS,
-          [
-            _sceneManager!,
-            meshEntity.toJS,
-            dataPtr,
-            idxPtr,
-            indices.length.toJS,
-            animation.numFrames.toJS,
-            animation.frameLengthInMs.toJS
-          ].toJS,
-          null) as JSBoolean;
+      bool result = false;
+      try {
+        var jsResult = _module.ccall(
+            "set_morph_animation",
+            "bool",
+            [
+              "void*".toJS,
+              "int".toJS,
+              "float*".toJS,
+              "int*".toJS,
+              "int".toJS,
+              "int".toJS,
+              "float".toJS
+            ].toJS,
+            [
+              _sceneManager!,
+              meshEntity.toJS,
+              dataPtr,
+              idxPtr,
+              indices.length.toJS,
+              animation.numFrames.toJS,
+              animation.frameLengthInMs.toJS
+            ].toJS,
+            null);
+        _logger.info("Got jsResult $jsResult");
+        result = (jsResult as JSNumber).toDartInt == 1;
+      } catch (err, st) {
+        _logger.severe(err);
+        _logger.severe(st);
+      }
 
       // Free the memory allocated in WASM
       _module._free(dataPtr);
       _module._free(idxPtr);
 
-      if (!result.toDart) {
+      if (!result) {
         throw Exception("Failed to set morph animation data for ${meshName}");
       }
     }
diff --git a/thermion_flutter/thermion_flutter_ffi/lib/thermion_flutter_ffi.dart b/thermion_flutter/thermion_flutter_ffi/lib/thermion_flutter_ffi.dart
index c34e3fea..805fe622 100644
--- a/thermion_flutter/thermion_flutter_ffi/lib/thermion_flutter_ffi.dart
+++ b/thermion_flutter/thermion_flutter_ffi/lib/thermion_flutter_ffi.dart
@@ -5,6 +5,7 @@ import 'package:thermion_dart/thermion_dart.dart';
 import 'package:thermion_dart/thermion_dart/thermion_viewer_ffi.dart';
 import 'package:thermion_flutter_platform_interface/thermion_flutter_platform_interface.dart';
 import 'package:thermion_flutter_platform_interface/thermion_flutter_texture.dart';
+import 'package:logging/logging.dart';
 
 ///
 /// An implementation of [ThermionFlutterPlatform] that uses a Flutter platform
@@ -13,6 +14,7 @@ import 'package:thermion_flutter_platform_interface/thermion_flutter_texture.dar
 ///
 class ThermionFlutterFFI extends ThermionFlutterPlatform {
   final _channel = const MethodChannel("dev.thermion.flutter/event");
+  final _logger = Logger("ThermionFlutterFFI");
 
   ThermionViewerFFI? _viewer;
 
@@ -133,7 +135,7 @@ class ThermionFlutterFFI extends ThermionFlutterPlatform {
     final hardwareTextureId = result[1] as int?;
     final surfaceAddress = result[2] as int?;
 
-    print(
+    _logger.info(
         "Created texture with flutter texture id ${flutterTextureId}, hardwareTextureId $hardwareTextureId and surfaceAddress $surfaceAddress");
 
     _viewer?.viewportDimensions = (width.toDouble(), height.toDouble());