diff --git a/source/core/core.js b/source/core/core.js
index d5f371d..6b8b07d 100644
--- a/source/core/core.js
+++ b/source/core/core.js
@@ -15,3 +15,15 @@ OV.ValueOrDefault = function (val, def)
     }
     return val;
 };
+
+OV.CopyObjectAttributes = function (src, dest)
+{
+    if (!OV.IsDefined (src)) {
+        return;
+    }
+    for (let attribute of Object.keys (src)) {
+        if (OV.IsDefined (src[attribute])) {
+            dest[attribute] = src[attribute];
+        }
+    }
+};
diff --git a/source/export/exportermodel.js b/source/export/exportermodel.js
index 94425fb..6f82779 100644
--- a/source/export/exportermodel.js
+++ b/source/export/exportermodel.js
@@ -5,11 +5,8 @@ OV.ExporterSettings = class
         this.isMeshVisible = (meshInstanceId) => {
             return true;
         };
-        if (OV.IsDefined (settings)) {
-            if (OV.IsDefined (settings.isMeshVisible)) {
-                this.isMeshVisible = settings.isMeshVisible;
-            }
-        }
+
+        OV.CopyObjectAttributes (settings, this);
     }
 };
 
@@ -18,7 +15,7 @@ OV.ExporterModel = class
     constructor (model, settings)
     {
         this.model = model;
-        this.settings = settings;
+        this.settings = settings || new OV.ExporterSettings ();
     }
 
     MaterialCount ()
diff --git a/test/tests/core_test.js b/test/tests/core_test.js
new file mode 100644
index 0000000..19d0679
--- /dev/null
+++ b/test/tests/core_test.js
@@ -0,0 +1,45 @@
+var assert = require ('assert');
+
+describe ('Core', function () {
+    it ('Is defined', function () {
+        assert.strictEqual (OV.IsDefined (null), false);
+        assert.strictEqual (OV.IsDefined (undefined), false);
+        assert.strictEqual (OV.IsDefined (0), true);
+        assert.strictEqual (OV.IsDefined (''), true);
+    });
+
+    it ('Value or default', function () {
+        assert.strictEqual (OV.ValueOrDefault (null, 5), 5);
+        assert.strictEqual (OV.ValueOrDefault (undefined, 5), 5);
+        assert.strictEqual (OV.ValueOrDefault (3, 5), 3);
+        assert.strictEqual (OV.ValueOrDefault ('a', 5), 'a');
+    });
+
+    it ('Copy object attributes', function () {
+        let src = {
+            a : null,
+            b : undefined,
+            c : 6
+        };
+
+        let dest = {};
+        OV.CopyObjectAttributes (src, dest);
+        assert.deepStrictEqual (dest, {c : 6});
+
+        let dest2 = {
+            a : 1,
+            b : 2,
+            c : 3
+        };
+        OV.CopyObjectAttributes (src, dest2);
+        assert.deepStrictEqual (dest2, {a : 1, b : 2, c : 6});
+
+        let dest3 = {
+            a : null,
+            b : null,
+            c : null
+        };
+        OV.CopyObjectAttributes (src, dest3);
+        assert.deepStrictEqual (dest3, {a : null, b : null, c : 6});
+    });
+});
diff --git a/test/tests/exporter_test.js b/test/tests/exporter_test.js
index 7b8e2a8..4ae01ff 100644
--- a/test/tests/exporter_test.js
+++ b/test/tests/exporter_test.js
@@ -73,40 +73,6 @@ function Export (model, format, extension, onReady)
     });
 }
 
-describe ('Exporter Model', function () {
-    it ('No filter test', function (done) {
-        let model = CreateTestModel ();
-        let settings = new OV.ExporterSettings ();
-        let exporterModel = new OV.ExporterModel (model, settings);
-        let meshInstances = [];
-        exporterModel.EnumerateMeshInstances ((meshInstance) => {
-            meshInstances.push (meshInstance);
-        });
-        assert.strictEqual (meshInstances.length, 2);
-        assert.strictEqual (exporterModel.VertexCount (), 8);
-        assert.strictEqual (exporterModel.TriangleCount (), 4);
-        done ();
-    });
-
-    it ('Model filter test', function (done) {
-        let model = CreateTestModel ();
-        let settings = new OV.ExporterSettings ({
-            isMeshVisible : (meshInstanceId) => {
-                return meshInstanceId.IsEqual (new OV.MeshInstanceId (0, 1));
-            }
-        });
-        let exporterModel = new OV.ExporterModel (model, settings);
-        let meshInstances = [];
-        exporterModel.EnumerateMeshInstances ((meshInstance) => {
-            meshInstances.push (meshInstance);
-        });
-        assert.strictEqual (meshInstances.length, 1);
-        assert.strictEqual (exporterModel.VertexCount (), 5);
-        assert.strictEqual (exporterModel.TriangleCount (), 3);
-        done ();
-    });
-});
-
 describe ('Exporter', function () {
     it ('Exporter Error', function (done) {
         let model = CreateTestModel ();
diff --git a/test/tests/exportermodel_test.js b/test/tests/exportermodel_test.js
new file mode 100644
index 0000000..dca5275
--- /dev/null
+++ b/test/tests/exportermodel_test.js
@@ -0,0 +1,63 @@
+var assert = require ('assert');
+
+function CreateTestModel ()
+{
+    let model = new OV.Model ();
+
+    for (let i = 0; i < 3; i++) {
+        let material = new OV.PhongMaterial ();
+        material.name = 'Material ' + i.toString ();
+        model.AddMaterial (material);
+    }
+
+    let root = model.GetRootNode ();
+    for (let i = 0; i < 3; i++) {
+        let genParams = new OV.GeneratorParams ().SetMaterial (i);
+        let cube = OV.GenerateCuboid (genParams, 1.0, 1.0, 1.0);
+        let meshIndex = model.AddMesh (cube);
+        let node = new OV.Node ();
+        node.AddMeshIndex (meshIndex);
+        node.SetTransformation (new OV.Transformation (new OV.Matrix ().CreateTranslation (i, 0.0, 0.0)));
+        root.AddChildNode (node);
+    }
+
+    OV.FinalizeModel (model, null);
+    return model;
+}
+
+function GetExporterModelBoundingBox (exporterModel)
+{
+    let calculator = new OV.BoundingBoxCalculator3D ();
+    exporterModel.EnumerateTransformedMeshes ((mesh) => {
+        mesh.EnumerateVertices ((vertex) => {
+            calculator.AddPoint (vertex);
+        });
+
+    });
+    return calculator.GetBox ();
+}
+
+describe ('Exporter Model', function () {
+    it ('No filter test', function () {
+        let model = CreateTestModel ();
+        let exporterModel = new OV.ExporterModel (model);
+        assert.strictEqual (exporterModel.MeshInstanceCount (), 3);
+        let boundingBox = GetExporterModelBoundingBox (exporterModel);
+        assert (OV.CoordIsEqual3D (boundingBox.min, new OV.Coord3D (0.0, 0.0, 0.0)));
+        assert (OV.CoordIsEqual3D (boundingBox.max, new OV.Coord3D (3.0, 1.0, 1.0)));
+    });
+
+    it ('Model filter test', function () {
+        let model = CreateTestModel ();
+        let settings = new OV.ExporterSettings ({
+            isMeshVisible : (meshInstanceId) => {
+                return !meshInstanceId.IsEqual (new OV.MeshInstanceId (3, 2));
+            }
+        });
+        let exporterModel = new OV.ExporterModel (model, settings);
+        assert.strictEqual (exporterModel.MeshInstanceCount (), 2);
+        let boundingBox = GetExporterModelBoundingBox (exporterModel);
+        assert (OV.CoordIsEqual3D (boundingBox.min, new OV.Coord3D (0.0, 0.0, 0.0)));
+        assert (OV.CoordIsEqual3D (boundingBox.max, new OV.Coord3D (2.0, 1.0, 1.0)));
+    });
+});