diff --git a/source/engine/import/importer3ds.js b/source/engine/import/importer3ds.js
index 4720f5f..6b57042 100644
--- a/source/engine/import/importer3ds.js
+++ b/source/engine/import/importer3ds.js
@@ -9,7 +9,7 @@ import { RGBColor, ColorComponentFromFloat } from '../model/color.js';
 import { PhongMaterial, TextureMap } from '../model/material.js';
 import { Mesh } from '../model/mesh.js';
 import { FlipMeshTrianglesOrientation, TransformMesh } from '../model/meshutils.js';
-import { Node, NodeType } from '../model/node.js';
+import { Node } from '../model/node.js';
 import { Triangle } from '../model/triangle.js';
 import { ImporterBase } from './importerbase.js';
 import { UpdateMaterialTransparency } from './importerutils.js';
@@ -550,7 +550,6 @@ export class Importer3ds extends ImporterBase
                 let isMeshNode = this.meshNameToIndex.has (node3ds.name);
                 node.SetTransformation (GetNodeTransformation (node3ds, isMeshNode));
                 if (isMeshNode) {
-                    node.SetType (NodeType.MeshNode);
                     node.AddMeshIndex (this.meshNameToIndex.get (node3ds.name));
                 }
             }
diff --git a/source/engine/import/importerbim.js b/source/engine/import/importerbim.js
index caa8156..3fa3762 100644
--- a/source/engine/import/importerbim.js
+++ b/source/engine/import/importerbim.js
@@ -2,7 +2,7 @@ import { IsObjectEmpty } from '../core/core.js';
 import { Coord3D } from '../geometry/coord3d.js';
 import { Direction } from '../geometry/geometry.js';
 import { ArrayBufferToUtf8String } from '../io/bufferutils.js';
-import { Node, NodeType } from '../model/node.js';
+import { Node } from '../model/node.js';
 import { Mesh } from '../model/mesh.js';
 import { Triangle } from '../model/triangle.js';
 import { ImporterBase } from './importerbase.js';
@@ -95,7 +95,6 @@ export class ImporterBim extends ImporterBase
         let meshIndex = this.model.AddMesh (mesh);
 
         let elementNode = new Node ();
-        elementNode.SetType (NodeType.MeshNode);
         elementNode.AddMeshIndex (meshIndex);
 
         let translation = new Coord3D (0.0, 0.0, 0.0);
diff --git a/source/engine/import/importerfcstd.js b/source/engine/import/importerfcstd.js
index 27c8552..1dc0507 100644
--- a/source/engine/import/importerfcstd.js
+++ b/source/engine/import/importerfcstd.js
@@ -4,7 +4,7 @@ import { GetFileExtension } from '../io/fileutils.js';
 import { GetExternalLibPath } from '../io/externallibs.js';
 import { ConvertThreeGeometryToMesh } from '../threejs/threeutils.js';
 import { ArrayBufferToUtf8String } from '../io/bufferutils.js';
-import { Node, NodeType } from '../model/node.js';
+import { Node } from '../model/node.js';
 import { ColorToMaterialConverter } from './importerutils.js';
 import { RGBAColor } from '../model/color.js';
 import { Property, PropertyGroup, PropertyType } from '../model/property.js';
@@ -387,7 +387,6 @@ export class ImporterFcstd extends ImporterBase
         }
 
         let objectNode = new Node ();
-        objectNode.SetType (NodeType.GroupNode);
         if (object.shapeName !== null) {
             objectNode.SetName (object.shapeName);
         }
diff --git a/source/engine/import/importergltf.js b/source/engine/import/importergltf.js
index b641a3f..54b19b0 100644
--- a/source/engine/import/importergltf.js
+++ b/source/engine/import/importergltf.js
@@ -11,7 +11,7 @@ import { LoadExternalLibrary } from '../io/externallibs.js';
 import { RGBColor, ColorComponentFromFloat, RGBColorFromFloatComponents, LinearToSRGB } from '../model/color.js';
 import { PhongMaterial, PhysicalMaterial, TextureMap } from '../model/material.js';
 import { Mesh } from '../model/mesh.js';
-import { Node, NodeType } from '../model/node.js';
+import { Node } from '../model/node.js';
 import { Property, PropertyGroup, PropertyType } from '../model/property.js';
 import { Triangle } from '../model/triangle.js';
 import { ImporterBase } from './importerbase.js';
@@ -1057,9 +1057,6 @@ export class ImporterGltf extends ImporterBase
         }
 
         if (gltfNode.mesh !== undefined) {
-            if (gltfNode.children === undefined || gltfNode.children.length === 0) {
-                node.SetType (NodeType.MeshNode);
-            }
             let mesh = this.model.GetMesh (gltfNode.mesh);
             this.ImportProperties (mesh, gltfNode.extras, 'Node properties');
             node.AddMeshIndex (gltfNode.mesh);
diff --git a/source/engine/import/importerthree.js b/source/engine/import/importerthree.js
index 9f26c99..22b0f5b 100644
--- a/source/engine/import/importerthree.js
+++ b/source/engine/import/importerthree.js
@@ -5,7 +5,7 @@ import { Transformation } from '../geometry/transformation.js';
 import { Base64DataURIToArrayBuffer, CreateObjectUrl, GetFileExtensionFromMimeType } from '../io/bufferutils.js';
 import { GetFileExtension, GetFileName } from '../io/fileutils.js';
 import { PhongMaterial, TextureMap } from '../model/material.js';
-import { Node, NodeType } from '../model/node.js';
+import { Node } from '../model/node.js';
 import { ConvertThreeColorToColor, ConvertThreeGeometryToMesh, ThreeLinearToSRGBColorConverter, ThreeSRGBToLinearColorConverter } from '../threejs/threeutils.js';
 import { ImporterBase } from './importerbase.js';
 
@@ -134,9 +134,6 @@ export class ImporterThreeBase extends ImporterBase
                 AddObject (importer, model, childObject, node);
             }
             if (threeObject.isMesh && importer.IsMeshVisible (threeObject)) {
-                if (threeObject.children.length === 0) {
-                    node.SetType (NodeType.MeshNode);
-                }
                 let mesh = importer.ConvertThreeMesh (threeObject);
                 let meshIndex = model.AddMesh (mesh);
                 node.AddMeshIndex (meshIndex);
diff --git a/source/engine/main.js b/source/engine/main.js
index 4662d98..6b02594 100644
--- a/source/engine/main.js
+++ b/source/engine/main.js
@@ -54,7 +54,7 @@ import { GetMeshType, CalculateTriangleNormal, TransformMesh, FlipMeshTrianglesO
 import { Model } from './model/model.js';
 import { FinalizeModel, CheckModel } from './model/modelfinalization.js';
 import { IsModelEmpty, GetBoundingBox, GetTopology, IsTwoManifold, HasDefaultMaterial, ReplaceDefaultMaterialColor } from './model/modelutils.js';
-import { Node, NodeType } from './model/node.js';
+import { Node } from './model/node.js';
 import { Object3D, ModelObject3D } from './model/object.js';
 import { Property, PropertyGroup, PropertyToString, PropertyType } from './model/property.js';
 import { GetTriangleArea, GetTetrahedronSignedVolume, CalculateVolume, CalculateSurfaceArea } from './model/quantities.js';
@@ -253,7 +253,6 @@ export {
     HasDefaultMaterial,
     ReplaceDefaultMaterialColor,
     Node,
-    NodeType,
     Object3D,
     ModelObject3D,
     Property,
diff --git a/source/engine/model/node.js b/source/engine/model/node.js
index 48c29f4..84a5340 100644
--- a/source/engine/model/node.js
+++ b/source/engine/model/node.js
@@ -15,17 +15,10 @@ class NodeIdGenerator
     }
 }
 
-export const NodeType =
-{
-    GroupNode : 0,
-    MeshNode : 1
-};
-
 export class Node
 {
     constructor ()
     {
-        this.type = NodeType.GroupNode;
         this.name = '';
         this.parent = null;
         this.transformation = new Transformation ();
@@ -42,14 +35,9 @@ export class Node
         return this.childNodes.length === 0 && this.meshIndices.length === 0;
     }
 
-    GetType ()
+    IsMeshNode ()
     {
-        return this.type;
-    }
-
-    SetType (type)
-    {
-        this.type = type;
+        return this.childNodes.length === 0 && this.meshIndices.length === 1;
     }
 
     GetId ()
diff --git a/source/website/navigatormeshespanel.js b/source/website/navigatormeshespanel.js
index cd2a1a0..e84345f 100644
--- a/source/website/navigatormeshespanel.js
+++ b/source/website/navigatormeshespanel.js
@@ -1,4 +1,3 @@
-import { NodeType } from '../engine/model/node.js';
 import { MeshInstanceId } from '../engine/model/meshinstance.js';
 import { AddDiv, CreateDiv, ShowDomElement, ClearDomElement, InsertDomElementBefore, SetDomElementHeight, GetDomElementOuterHeight, IsDomElementVisible } from '../engine/viewer/domutils.js';
 import { CalculatePopupPositionToElementBottomRight, ShowListPopup } from './dialogs.js';
@@ -147,7 +146,7 @@ export class NavigatorMeshesPanel extends NavigatorPanel
         const rootNode = importResult.model.GetRootNode ();
         let isHierarchical = false;
         for (let childNode of rootNode.GetChildNodes ()) {
-            if (childNode.GetType () === NodeType.GroupNode) {
+            if (childNode.ChildNodeCount () > 0) {
                 isHierarchical = true;
                 break;
             }
@@ -380,12 +379,12 @@ export class NavigatorMeshesPanel extends NavigatorPanel
             let meshNodes = [];
             for (let childNode of node.GetChildNodes ()) {
                 if (mode === MeshesPanelMode.TreeView) {
-                    if (childNode.GetType () === NodeType.GroupNode) {
+                    if (childNode.IsMeshNode ()) {
+                        meshNodes.push (childNode);
+                    } else {
                         let nodeItem = CreateNodeItem (panel, childNode);
                         parentItem.AddChild (nodeItem);
                         AddModelNodeToTree (panel, model, childNode, nodeItem, mode);
-                    } else if (childNode.GetType () === NodeType.MeshNode) {
-                        meshNodes.push (childNode);
                     }
                 } else {
                     AddModelNodeToTree (panel, model, childNode, parentItem, mode);