diff --git a/dust3d.pro b/dust3d.pro
index a269a1ef..18dd69fe 100644
--- a/dust3d.pro
+++ b/dust3d.pro
@@ -42,9 +42,6 @@ HEADERS += src/modelshaderprogram.h
 SOURCES += src/modelmeshbinder.cpp
 HEADERS += src/modelmeshbinder.h
 
-SOURCES += src/modelofflinerender.cpp
-HEADERS += src/modelofflinerender.h
-
 SOURCES += src/modelwidget.cpp
 HEADERS += src/modelwidget.h
 
diff --git a/src/meshgenerator.cpp b/src/meshgenerator.cpp
index 6b91c171..d8aa70a0 100644
--- a/src/meshgenerator.cpp
+++ b/src/meshgenerator.cpp
@@ -5,7 +5,6 @@
 #include "dust3dutil.h"
 #include "skeletondocument.h"
 #include "meshlite.h"
-#include "modelofflinerender.h"
 #include "meshutil.h"
 #include "theme.h"
 #include "positionmap.h"
@@ -32,7 +31,7 @@ void GeneratedCacheContext::updateComponentCombinableMesh(QString componentId, v
 MeshGenerator::MeshGenerator(SkeletonSnapshot *snapshot, QThread *thread) :
     m_snapshot(snapshot),
     m_mesh(nullptr),
-    m_preview(nullptr),
+    //m_preview(nullptr),
     m_thread(thread),
     m_meshResultContext(nullptr),
     m_sharedContextWidget(nullptr),
@@ -45,12 +44,8 @@ MeshGenerator::~MeshGenerator()
 {
     delete m_snapshot;
     delete m_mesh;
-    delete m_preview;
-    for (const auto &partPreviewIt: m_partPreviewMap) {
-        delete partPreviewIt.second;
-    }
-    for (const auto &render: m_partPreviewRenderMap) {
-        delete render.second;
+    for (const auto &partPreviewMeshIt: m_partPreviewMeshMap) {
+        delete partPreviewMeshIt.second;
     }
     delete m_meshResultContext;
 }
@@ -65,15 +60,10 @@ void MeshGenerator::setGeneratedCacheContext(GeneratedCacheContext *cacheContext
     m_cacheContext = cacheContext;
 }
 
-void MeshGenerator::addPartPreviewRequirement(const QString &partId)
+void MeshGenerator::addPartPreviewRequirement(const QUuid &partId)
 {
     //qDebug() << "addPartPreviewRequirement:" << partId;
-    m_requirePartPreviewMap.insert(partId);
-    if (m_partPreviewRenderMap.find(partId) == m_partPreviewRenderMap.end()) {
-        ModelOfflineRender *render = new ModelOfflineRender(m_sharedContextWidget);
-        render->setRenderThread(m_thread);
-        m_partPreviewRenderMap[partId] = render;
-    }
+    m_requirePreviewPartIds.insert(partId);
 }
 
 void MeshGenerator::setSharedContextWidget(QOpenGLWidget *widget)
@@ -88,18 +78,21 @@ MeshLoader *MeshGenerator::takeResultMesh()
     return resultMesh;
 }
 
-QImage *MeshGenerator::takePreview()
+MeshLoader *MeshGenerator::takePartPreviewMesh(const QUuid &partId)
 {
-    QImage *resultPreview = m_preview;
-    m_preview = nullptr;
-    return resultPreview;
+    MeshLoader *resultMesh = m_partPreviewMeshMap[partId];
+    m_partPreviewMeshMap[partId] = nullptr;
+    return resultMesh;
 }
 
-QImage *MeshGenerator::takePartPreview(const QString &partId)
+const std::set<QUuid> &MeshGenerator::requirePreviewPartIds()
 {
-    QImage *resultImage = m_partPreviewMap[partId];
-    m_partPreviewMap[partId] = nullptr;
-    return resultImage;
+    return m_requirePreviewPartIds;
+}
+
+const std::set<QUuid> &MeshGenerator::generatedPreviewPartIds()
+{
+    return m_generatedPreviewPartIds;
 }
 
 MeshResultContext *MeshGenerator::takeMeshResultContext()
@@ -360,18 +353,10 @@ void *MeshGenerator::combinePartMesh(QString partId)
         }
     }
     
-    if (m_requirePartPreviewMap.find(partId) != m_requirePartPreviewMap.end()) {
-        ModelOfflineRender *render = m_partPreviewRenderMap[partId];
+    if (m_requirePreviewPartIds.find(partIdNotAsString) != m_requirePreviewPartIds.end()) {
         int trimedMeshId = meshlite_trim(m_meshliteContext, meshId, 1);
-        render->updateMesh(new MeshLoader(m_meshliteContext, trimedMeshId, -1, partColor, nullptr, m_smoothNormal));
-        QImage *image = new QImage(render->toImage(QSize(Theme::previewImageRenderSize, Theme::previewImageRenderSize)));
-        if (Theme::previewImageSize != Theme::previewImageRenderSize) {
-            int cropOffset = (Theme::previewImageRenderSize - Theme::previewImageSize) / 2;
-            QImage *crop = new QImage(image->copy(cropOffset, cropOffset, Theme::previewImageSize, Theme::previewImageSize));
-            delete image;
-            image = crop;
-        }
-        m_partPreviewMap[partId] = image;
+        m_partPreviewMeshMap[partIdNotAsString] = new MeshLoader(m_meshliteContext, trimedMeshId, -1, partColor, nullptr, m_smoothNormal);
+        m_generatedPreviewPartIds.insert(partIdNotAsString);
     }
     
     if (isDisabled) {
diff --git a/src/meshgenerator.h b/src/meshgenerator.h
index 2ca963c1..77207129 100644
--- a/src/meshgenerator.h
+++ b/src/meshgenerator.h
@@ -9,7 +9,6 @@
 #include <QOpenGLWidget>
 #include "skeletonsnapshot.h"
 #include "meshloader.h"
-#include "modelofflinerender.h"
 #include "meshresultcontext.h"
 #include "positionmap.h"
 
@@ -34,12 +33,13 @@ public:
     MeshGenerator(SkeletonSnapshot *snapshot, QThread *thread);
     ~MeshGenerator();
     void setSharedContextWidget(QOpenGLWidget *widget);
-    void addPartPreviewRequirement(const QString &partId);
+    void addPartPreviewRequirement(const QUuid &partId);
     void setGeneratedCacheContext(GeneratedCacheContext *cacheContext);
     void setSmoothNormal(bool smoothNormal);
     MeshLoader *takeResultMesh();
-    QImage *takePreview();
-    QImage *takePartPreview(const QString &partId);
+    MeshLoader *takePartPreviewMesh(const QUuid &partId);
+    const std::set<QUuid> &requirePreviewPartIds();
+    const std::set<QUuid> &generatedPreviewPartIds();
     MeshResultContext *takeMeshResultContext();
 signals:
     void finished();
@@ -48,10 +48,9 @@ public slots:
 private:
     SkeletonSnapshot *m_snapshot;
     MeshLoader *m_mesh;
-    QImage *m_preview;
-    std::map<QString, QImage *> m_partPreviewMap;
-    std::set<QString> m_requirePartPreviewMap;
-    std::map<QString, ModelOfflineRender *> m_partPreviewRenderMap;
+    std::map<QUuid, MeshLoader *> m_partPreviewMeshMap;
+    std::set<QUuid> m_requirePreviewPartIds;
+    std::set<QUuid> m_generatedPreviewPartIds;
     QThread *m_thread;
     MeshResultContext *m_meshResultContext;
     QOpenGLWidget *m_sharedContextWidget;
diff --git a/src/meshloader.cpp b/src/meshloader.cpp
index 69fde464..886be732 100644
--- a/src/meshloader.cpp
+++ b/src/meshloader.cpp
@@ -244,6 +244,15 @@ MeshLoader::MeshLoader(MeshResultContext &resultContext) :
     }
 }
 
+MeshLoader::MeshLoader() :
+    m_triangleVertices(nullptr),
+    m_triangleVertexCount(0),
+    m_edgeVertices(nullptr),
+    m_edgeVertexCount(0),
+    m_textureImage(nullptr)
+{
+}
+
 MeshLoader::~MeshLoader()
 {
     delete[] m_triangleVertices;
diff --git a/src/meshloader.h b/src/meshloader.h
index eafa52ff..71a166f5 100644
--- a/src/meshloader.h
+++ b/src/meshloader.h
@@ -42,6 +42,7 @@ public:
     MeshLoader(MeshResultContext &resultContext);
     MeshLoader(Vertex *triangleVertices, int vertexNum);
     MeshLoader(const MeshLoader &mesh);
+    MeshLoader();
     ~MeshLoader();
     Vertex *triangleVertices();
     int triangleVertexCount();
@@ -54,15 +55,15 @@ public:
     void setTextureImage(QImage *textureImage);
     const QImage *textureImage();
 private:
-    Vertex *m_triangleVertices;
-    int m_triangleVertexCount;
-    Vertex *m_edgeVertices;
-    int m_edgeVertexCount;
+    Vertex *m_triangleVertices = nullptr;
+    int m_triangleVertexCount = 0;
+    Vertex *m_edgeVertices = nullptr;
+    int m_edgeVertexCount = 0;
     std::vector<QVector3D> m_vertices;
     std::vector<std::vector<int>> m_faces;
     std::vector<QVector3D> m_triangulatedVertices;
     std::vector<TriangulatedFace> m_triangulatedFaces;
-    QImage *m_textureImage;
+    QImage *m_textureImage = nullptr;
 };
 
 #endif
diff --git a/src/modelofflinerender.cpp b/src/modelofflinerender.cpp
deleted file mode 100644
index 52d2c20a..00000000
--- a/src/modelofflinerender.cpp
+++ /dev/null
@@ -1,151 +0,0 @@
-#include <QOpenGLFramebufferObjectFormat>
-#include <QThread>
-#include <QDebug>
-#include "modelofflinerender.h"
-
-ModelOfflineRender::ModelOfflineRender(QOpenGLWidget *sharedContextWidget, QScreen *targetScreen) :
-    QOffscreenSurface(targetScreen),
-    m_context(nullptr),
-    m_mesh(nullptr),
-    m_xRot(0),
-    m_yRot(0),
-    m_zRot(0)
-{
-    create();
-    
-    QOpenGLContext *current = nullptr;
-    
-    if (nullptr != sharedContextWidget) {
-        current = sharedContextWidget->context();
-        current->doneCurrent();
-    }
-    
-    m_context = new QOpenGLContext();
-    
-    if (nullptr != current) {
-        m_context->setFormat(current->format());
-        m_context->setShareContext(current);
-    } else {
-        QSurfaceFormat fmt = format();
-        fmt.setAlphaBufferSize(8);
-        fmt.setSamples(4);
-        
-        setFormat(fmt);
-        
-        m_context->setFormat(fmt);
-    }
-    m_context->create();
-    
-    if (nullptr != sharedContextWidget) {
-        sharedContextWidget->makeCurrent();
-    }
-}
-
-ModelOfflineRender::~ModelOfflineRender()
-{
-    delete m_context;
-    m_context = nullptr;
-    destroy();
-    delete m_mesh;
-}
-
-void ModelOfflineRender::updateMesh(MeshLoader *mesh)
-{
-    delete m_mesh;
-    m_mesh = mesh;
-}
-
-void ModelOfflineRender::setRenderThread(QThread *thread)
-{
-    m_context->moveToThread(thread);
-}
-
-QImage ModelOfflineRender::toImage(const QSize &size)
-{
-    QImage image;
-    
-    m_context->makeCurrent(this);
-    
-    QOpenGLFramebufferObjectFormat format;
-    format.setAttachment(QOpenGLFramebufferObject::CombinedDepthStencil);
-    format.setSamples(16);
-    QOpenGLFramebufferObject *renderFbo = new QOpenGLFramebufferObject(size, format);
-    renderFbo->bind();
-    m_context->functions()->glViewport(0, 0, size.width(), size.height());
-    
-    if (nullptr != m_mesh) {
-        int xRot = m_xRot;
-        int yRot = m_yRot;
-        int zRot = m_zRot;
-        QMatrix4x4 proj;
-        QMatrix4x4 camera;
-        QMatrix4x4 world;
-
-        ModelShaderProgram *program = new ModelShaderProgram;
-        ModelMeshBinder meshBinder;
-        meshBinder.initialize();
-        meshBinder.hideWireframes();
-
-        program->setUniformValue(program->lightPosLoc(), QVector3D(0, 0, 70));
-		
-        m_context->functions()->glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-        m_context->functions()->glEnable(GL_DEPTH_TEST);
-        m_context->functions()->glEnable(GL_CULL_FACE);
-        m_context->functions()->glEnable(GL_LINE_SMOOTH);
-
-        camera.setToIdentity();
-        camera.translate(0, 0, -4.5);
-
-        world.setToIdentity();
-        world.rotate(xRot / 16.0f, 1, 0, 0);
-        world.rotate(yRot / 16.0f, 0, 1, 0);
-        world.rotate(zRot / 16.0f, 0, 0, 1);
-
-        proj.setToIdentity();
-        proj.perspective(45.0f, GLfloat(size.width()) / size.height(), 0.01f, 100.0f);
-
-        program->bind();
-        program->setUniformValue(program->projMatrixLoc(), proj);
-        program->setUniformValue(program->mvMatrixLoc(), camera * world);
-        QMatrix3x3 normalMatrix = world.normalMatrix();
-        program->setUniformValue(program->normalMatrixLoc(), normalMatrix);
-        program->setUniformValue(program->textureEnabledLoc(), 0);
-
-        meshBinder.updateMesh(m_mesh);
-        meshBinder.paint(program);
-
-        meshBinder.cleanup();
-
-        program->release();
-        delete program;
-
-        m_mesh = nullptr;
-    }
-
-    m_context->functions()->glFlush();
-
-    image = renderFbo->toImage();
-
-    renderFbo->bindDefault();
-    delete renderFbo;
-
-    m_context->doneCurrent();
-
-    return image;
-}
-
-void ModelOfflineRender::setXRotation(int angle)
-{
-    m_xRot = angle;
-}
-
-void ModelOfflineRender::setYRotation(int angle)
-{
-    m_yRot = angle;
-}
-
-void ModelOfflineRender::setZRotation(int angle)
-{
-    m_zRot = angle;
-}
-
diff --git a/src/modelofflinerender.h b/src/modelofflinerender.h
deleted file mode 100644
index b1fc64bf..00000000
--- a/src/modelofflinerender.h
+++ /dev/null
@@ -1,33 +0,0 @@
-#ifndef MODEL_OFFLINE_RENDER_H
-#define MODEL_OFFLINE_RENDER_H
-#include <QOffscreenSurface>
-#include <QScreen>
-#include <QOpenGLFunctions>
-#include <QOpenGLContext>
-#include <QImage>
-#include <QThread>
-#include <QOpenGLWidget>
-#include "modelshaderprogram.h"
-#include "modelmeshbinder.h"
-#include "meshloader.h"
-
-class ModelOfflineRender : QOffscreenSurface
-{
-public:
-	ModelOfflineRender(QOpenGLWidget *sharedContextWidget = nullptr, QScreen *targetScreen = Q_NULLPTR);
-    ~ModelOfflineRender();
-    void setRenderThread(QThread *thread);
-    void updateMesh(MeshLoader *mesh);
-    QImage toImage(const QSize &size);
-    void setXRotation(int angle);
-    void setYRotation(int angle);
-    void setZRotation(int angle);
-private:
-    QOpenGLContext *m_context;
-    MeshLoader *m_mesh;
-    int m_xRot;
-    int m_yRot;
-    int m_zRot;
-};
-
-#endif
diff --git a/src/modelwidget.cpp b/src/modelwidget.cpp
index 4484577e..a6e40621 100644
--- a/src/modelwidget.cpp
+++ b/src/modelwidget.cpp
@@ -19,7 +19,9 @@ ModelWidget::ModelWidget(QWidget *parent) :
     m_zRot(0),
     m_program(nullptr),
     m_moveStarted(false),
-    m_graphicsFunctions(NULL)
+    m_graphicsFunctions(NULL),
+    m_moveEnabled(true),
+    m_zoomEnabled(true)
 {
     // --transparent causes the clear color to be transparent. Therefore, on systems that
     // support it, the widget will become transparent apart from the logo.
@@ -192,7 +194,7 @@ void ModelWidget::mousePressEvent(QMouseEvent *event)
             shouldStartMove = true;
         }
     } else if (event->button() == Qt::MidButton) {
-        shouldStartMove = true;
+        shouldStartMove = m_moveEnabled;
     }
     if (shouldStartMove) {
         m_lastPos = event->pos();
@@ -270,6 +272,8 @@ void ModelWidget::wheelEvent(QWheelEvent *event)
         return;
     if (m_moveStarted)
         return;
+    if (!m_zoomEnabled)
+        return;
     qreal delta = event->delta() / 10;
     if (QGuiApplication::queryKeyboardModifiers().testFlag(Qt::ShiftModifier)) {
         if (delta > 0)
@@ -299,3 +303,12 @@ void ModelWidget::exportMeshAsObjPlusMaterials(const QString &filename)
     m_meshBinder.exportMeshAsObjPlusMaterials(filename);
 }
 
+void ModelWidget::enableMove(bool enabled)
+{
+    m_moveEnabled = enabled;
+}
+
+void ModelWidget::enableZoom(bool enabled)
+{
+    m_zoomEnabled = enabled;
+}
diff --git a/src/modelwidget.h b/src/modelwidget.h
index 6f849aa2..5daf126f 100644
--- a/src/modelwidget.h
+++ b/src/modelwidget.h
@@ -16,19 +16,24 @@ class SkeletonGraphicsFunctions;
 class ModelWidget : public QOpenGLWidget, protected QOpenGLFunctions
 {
     Q_OBJECT
-
 public:
     ModelWidget(QWidget *parent = 0);
     ~ModelWidget();
-
-    static bool isTransparent() { return m_transparent; }
-    static void setTransparent(bool t) { m_transparent = t; }
-    
+    static bool isTransparent()
+    {
+        return m_transparent;
+    }
+    static void setTransparent(bool t)
+    {
+        m_transparent = t;
+    }
     void updateMesh(MeshLoader *mesh);
     void exportMeshAsObj(const QString &filename);
     void exportMeshAsObjPlusMaterials(const QString &filename);
     void setGraphicsFunctions(SkeletonGraphicsFunctions *graphicsFunctions);
     void toggleWireframe();
+    void enableMove(bool enabled);
+    void enableZoom(bool enabled);
 public slots:
     void setXRotation(int angle);
     void setYRotation(int angle);
@@ -39,7 +44,6 @@ signals:
     void xRotationChanged(int angle);
     void yRotationChanged(int angle);
     void zRotationChanged(int angle);
-
 protected:
     void initializeGL() override;
     void paintGL() override;
@@ -61,6 +65,8 @@ private:
     ModelShaderProgram *m_program;
     bool m_moveStarted;
     SkeletonGraphicsFunctions *m_graphicsFunctions;
+    bool m_moveEnabled;
+    bool m_zoomEnabled;
 private:
     QPoint m_lastPos;
     ModelMeshBinder m_meshBinder;
diff --git a/src/skeletondocument.cpp b/src/skeletondocument.cpp
index 9175d84f..9e4f67bb 100644
--- a/src/skeletondocument.cpp
+++ b/src/skeletondocument.cpp
@@ -137,7 +137,9 @@ void SkeletonDocument::removeEdge(QUuid edgeId)
     std::vector<std::vector<QUuid>> groups;
     splitPartByEdge(&groups, edgeId);
     for (auto groupIt = groups.begin(); groupIt != groups.end(); groupIt++) {
-        SkeletonPart part;
+        const auto newUuid = QUuid::createUuid();
+        SkeletonPart &part = partMap[newUuid];
+        part.id = newUuid;
         part.copyAttributes(*oldPart);
         part.name = nextPartName;
         for (auto nodeIdIt = (*groupIt).begin(); nodeIdIt != (*groupIt).end(); nodeIdIt++) {
@@ -157,7 +159,6 @@ void SkeletonDocument::removeEdge(QUuid edgeId)
                 edgeIt->second.partId = part.id;
             }
         }
-        partMap[part.id] = part;
         addPartToComponent(part.id, findComponentParentId(part.componentId));
         emit partAdded(part.id);
     }
@@ -196,7 +197,9 @@ void SkeletonDocument::removeNode(QUuid nodeId)
     std::vector<std::vector<QUuid>> groups;
     splitPartByNode(&groups, nodeId);
     for (auto groupIt = groups.begin(); groupIt != groups.end(); groupIt++) {
-        SkeletonPart part;
+        const auto newUuid = QUuid::createUuid();
+        SkeletonPart &part = partMap[newUuid];
+        part.id = newUuid;
         part.copyAttributes(*oldPart);
         part.name = nextPartName;
         for (auto nodeIdIt = (*groupIt).begin(); nodeIdIt != (*groupIt).end(); nodeIdIt++) {
@@ -216,7 +219,6 @@ void SkeletonDocument::removeNode(QUuid nodeId)
                 edgeIt->second.partId = part.id;
             }
         }
-        partMap[part.id] = part;
         addPartToComponent(part.id, findComponentParentId(part.componentId));
         emit partAdded(part.id);
     }
@@ -254,8 +256,9 @@ QUuid SkeletonDocument::createNode(float x, float y, float z, float radius, QUui
     const SkeletonNode *fromNode = nullptr;
     bool newPartAdded = false;
     if (fromNodeId.isNull()) {
-        SkeletonPart part;
-        partMap[part.id] = part;
+        const auto newUuid = QUuid::createUuid();
+        SkeletonPart &part = partMap[newUuid];
+        part.id = newUuid;
         partId = part.id;
         emit partAdded(partId);
         newPartAdded = true;
@@ -828,7 +831,9 @@ void SkeletonDocument::addFromSnapshot(const SkeletonSnapshot &snapshot, bool fr
     
     std::map<QUuid, QUuid> oldNewIdMap;
     for (const auto &partKv: snapshot.parts) {
-        SkeletonPart part;
+        const auto newUuid = QUuid::createUuid();
+        SkeletonPart &part = partMap[newUuid];
+        part.id = newUuid;
         oldNewIdMap[QUuid(partKv.first)] = part.id;
         part.name = valueOfKeyInMapOrEmpty(partKv.second, "name");
         part.visible = isTrueValueString(valueOfKeyInMapOrEmpty(partKv.second, "visible"));
@@ -852,7 +857,6 @@ void SkeletonDocument::addFromSnapshot(const SkeletonSnapshot &snapshot, bool fr
         const auto &deformWidthIt = partKv.second.find("deformWidth");
         if (deformWidthIt != partKv.second.end())
             part.setDeformWidth(deformWidthIt->second.toFloat());
-        partMap[part.id] = part;
         newAddedPartIds.insert(part.id);
     }
     for (const auto &nodeKv: snapshot.nodes) {
@@ -1037,18 +1041,12 @@ void SkeletonDocument::meshReady()
     MeshLoader *resultMesh = m_meshGenerator->takeResultMesh();
     MeshResultContext *meshResultContext = m_meshGenerator->takeMeshResultContext();
     
-    QImage *resultPreview = m_meshGenerator->takePreview();
-    if (resultPreview) {
-        preview = *resultPreview;
-        delete resultPreview;
-    }
-    
-    for (auto &part: partMap) {
-        QImage *resultPartPreview = m_meshGenerator->takePartPreview(part.first.toString());
-        if (resultPartPreview) {
-            part.second.preview = *resultPartPreview;
-            emit partPreviewChanged(part.first);
-            delete resultPartPreview;
+    for (auto &partId: m_meshGenerator->generatedPreviewPartIds()) {
+        auto part = partMap.find(partId);
+        if (part != partMap.end()) {
+            MeshLoader *resultPartPreviewMesh = m_meshGenerator->takePartPreviewMesh(partId);
+            part->second.updatePreviewMesh(resultPartPreviewMesh);
+            emit partPreviewChanged(partId);
         }
     }
     
@@ -1134,7 +1132,7 @@ void SkeletonDocument::generateMesh()
         m_meshGenerator->setSharedContextWidget(m_sharedContextWidget);
     m_meshGenerator->moveToThread(thread);
     for (auto &part: partMap) {
-        m_meshGenerator->addPartPreviewRequirement(part.first.toString());
+        m_meshGenerator->addPartPreviewRequirement(part.first);
     }
     connect(thread, &QThread::started, m_meshGenerator, &MeshGenerator::process);
     connect(m_meshGenerator, &MeshGenerator::finished, this, &SkeletonDocument::meshReady);
diff --git a/src/skeletondocument.h b/src/skeletondocument.h
index 3b75d26f..12d48d12 100644
--- a/src/skeletondocument.h
+++ b/src/skeletondocument.h
@@ -74,6 +74,10 @@ public:
 class SkeletonPart
 {
 public:
+    ~SkeletonPart()
+    {
+        delete m_previewMesh;
+    }
     QUuid id;
     QString name;
     bool visible;
@@ -87,7 +91,6 @@ public:
     bool rounded;
     QColor color;
     bool hasColor;
-    QImage preview;
     QUuid componentId;
     std::vector<QUuid> nodeIds;
     bool dirty;
@@ -157,6 +160,20 @@ public:
         wrapped = other.wrapped;
         componentId = other.componentId;
     }
+    void updatePreviewMesh(MeshLoader *previewMesh)
+    {
+        delete m_previewMesh;
+        m_previewMesh = previewMesh;
+    }
+    MeshLoader *takePreviewMesh() const
+    {
+        if (nullptr == m_previewMesh)
+            return nullptr;
+        return new MeshLoader(*m_previewMesh);
+    }
+private:
+    Q_DISABLE_COPY(SkeletonPart);
+    MeshLoader *m_previewMesh = nullptr;
 };
 
 enum class SkeletonProfile
@@ -564,8 +581,8 @@ private: // need initialize
     MeshLoader *m_resultRigWeightMesh;
     std::vector<AutoRiggerBone> *m_resultRigBones;
     std::map<int, AutoRiggerVertexWeights> *m_resultRigWeights;
-    MeshResultContext *m_riggedResultContext;
     bool m_isRigObsolete;
+    MeshResultContext *m_riggedResultContext;
 private:
     static unsigned long m_maxSnapshot;
     std::deque<SkeletonHistoryItem> m_undoItems;
diff --git a/src/skeletondocumentwindow.cpp b/src/skeletondocumentwindow.cpp
index 0ace9b5a..01a0291c 100644
--- a/src/skeletondocumentwindow.cpp
+++ b/src/skeletondocumentwindow.cpp
@@ -29,7 +29,6 @@
 #include "graphicscontainerwidget.h"
 #include "skeletonparttreewidget.h"
 #include "rigwidget.h"
-#include "modelofflinerender.h"
 #include "markiconcreator.h"
 #include "tetrapodposeeditwidget.h"
 
@@ -1055,18 +1054,6 @@ void SkeletonDocumentWindow::exportObjPlusMaterialsResult()
     QApplication::restoreOverrideCursor();
 }
 
-void SkeletonDocumentWindow::exportRenderedResult()
-{
-    QString filename = QFileDialog::getSaveFileName(this, QString(), QString(),
-       tr("Image (*.png)"));
-    if (filename.isEmpty()) {
-        return;
-    }
-    QApplication::setOverrideCursor(Qt::WaitCursor);
-    exportRenderedAsImage(filename);
-    QApplication::restoreOverrideCursor();
-}
-
 void SkeletonDocumentWindow::showExportPreview()
 {
     if (nullptr == m_exportPreviewWidget) {
@@ -1146,14 +1133,3 @@ void SkeletonDocumentWindow::updateRadiusLockButtonState()
     else
         m_radiusLockButton->setStyleSheet("QPushButton {color: " + Theme::white.name() + "}");
 }
-
-void SkeletonDocumentWindow::exportRenderedAsImage(const QString &filename)
-{
-    ModelOfflineRender offlineRender(m_modelRenderWidget);
-    offlineRender.setXRotation(m_modelRenderWidget->xRot());
-    offlineRender.setYRotation(m_modelRenderWidget->yRot());
-    offlineRender.setZRotation(m_modelRenderWidget->zRot());
-    offlineRender.updateMesh(m_document->takeResultMesh());
-    QImage renderedImage = offlineRender.toImage(QSize(1024, 1024));
-    renderedImage.save(filename);
-}
diff --git a/src/skeletondocumentwindow.h b/src/skeletondocumentwindow.h
index ebfa8936..d51f5ae5 100644
--- a/src/skeletondocumentwindow.h
+++ b/src/skeletondocumentwindow.h
@@ -39,7 +39,6 @@ public slots:
     void exportObjResult();
     void exportObjPlusMaterialsResult();
     void exportGltfResult();
-    void exportRenderedResult();
     void showExportPreview();
     void newWindow();
     void newDocument();
@@ -60,7 +59,6 @@ private:
     void initLockButton(QPushButton *button);
     void setCurrentFilename(const QString &filename);
     void updateTitle();
-    void exportRenderedAsImage(const QString &filename);
 private:
     SkeletonDocument *m_document;
     bool m_firstShow;
diff --git a/src/skeletonparttreewidget.cpp b/src/skeletonparttreewidget.cpp
index 031365b0..e8d14dbb 100644
--- a/src/skeletonparttreewidget.cpp
+++ b/src/skeletonparttreewidget.cpp
@@ -62,6 +62,42 @@ SkeletonPartTreeWidget::SkeletonPartTreeWidget(const SkeletonDocument *document,
     connect(this, &QTreeWidget::itemCollapsed, this, &SkeletonPartTreeWidget::groupCollapsed);
 }
 
+bool SkeletonPartTreeWidget::mouseMove(QMouseEvent *event)
+{
+    return false;
+}
+
+bool SkeletonPartTreeWidget::wheel(QWheelEvent *event)
+{
+    return false;
+}
+
+bool SkeletonPartTreeWidget::mouseRelease(QMouseEvent *event)
+{
+    return false;
+}
+
+bool SkeletonPartTreeWidget::mousePress(QMouseEvent *event)
+{
+    if (event->button() == Qt::RightButton) {
+        showContextMenu(mapFromGlobal(event->globalPos()));
+        return true;
+    }
+    return false;
+}
+
+bool SkeletonPartTreeWidget::mouseDoubleClick(QMouseEvent *event)
+{
+    return false;
+}
+
+bool SkeletonPartTreeWidget::keyPress(QKeyEvent *event)
+{
+    if (m_graphicsFunctions)
+        return m_graphicsFunctions->keyPress(event);
+    return false;
+}
+
 void SkeletonPartTreeWidget::selectComponent(QUuid componentId, bool multiple)
 {
     if (multiple) {
@@ -194,6 +230,7 @@ void SkeletonPartTreeWidget::showContextMenu(const QPoint &pos)
 {
     const SkeletonComponent *component = nullptr;
     const SkeletonPart *part = nullptr;
+    SkeletonPartWidget *partWidget = nullptr;
     
     std::set<QUuid> unorderedComponentIds = m_selectedComponentIds;
     if (!m_currentSelectedComponentId.isNull())
@@ -229,22 +266,38 @@ void SkeletonPartTreeWidget::showContextMenu(const QPoint &pos)
         }
     }
     
-    QWidgetAction forDisplayPartImage(this);
-    QLabel *previewLabel = new QLabel;
-    previewLabel->setFixedHeight(Theme::previewImageSize);
-    previewLabel->setStyleSheet("QLabel {color: " + Theme::red.name() + "}");
-    if (nullptr != part) {
-        previewLabel->setPixmap(QPixmap::fromImage(part->preview));
-    } else if (nullptr != component) {
-        previewLabel->setText(component->name);
-    } else if (!componentIds.empty()) {
-        previewLabel->setText(tr("(%1 items)").arg(QString::number(componentIds.size())));
-    }
     QHBoxLayout *layout = new QHBoxLayout;
+    QWidgetAction forDisplayPartImage(this);
     layout->setAlignment(Qt::AlignCenter);
-    layout->addWidget(previewLabel);
     layout->setContentsMargins(0, 0, 0, 0);
     layout->setSpacing(0);
+    if (nullptr != part) {
+        auto findItem = m_partItemMap.find(part->id);
+        if (findItem != m_partItemMap.end()) {
+            partWidget = (SkeletonPartWidget *)itemWidget(findItem->second, 0);
+        }
+    }
+    if (nullptr != part && nullptr != partWidget) {
+        ModelWidget *previewWidget = new ModelWidget;
+        previewWidget->enableMove(false);
+        previewWidget->enableZoom(false);
+        previewWidget->setFixedSize(Theme::previewImageSize, Theme::previewImageSize);
+        previewWidget->setXRotation(partWidget->previewWidget()->xRot());
+        previewWidget->setYRotation(partWidget->previewWidget()->yRot());
+        previewWidget->setZRotation(partWidget->previewWidget()->zRot());
+        previewWidget->updateMesh(part->takePreviewMesh());
+        layout->addWidget(previewWidget);
+    } else {
+        QLabel *previewLabel = new QLabel;
+        previewLabel->setFixedHeight(Theme::previewImageSize);
+        previewLabel->setStyleSheet("QLabel {color: " + Theme::red.name() + "}");
+        if (nullptr != component) {
+            previewLabel->setText(component->name);
+        } else if (!componentIds.empty()) {
+            previewLabel->setText(tr("(%1 items)").arg(QString::number(componentIds.size())));
+        }
+        layout->addWidget(previewLabel);
+    }
     QWidget *widget = new QWidget;
     widget->setLayout(layout);
     forDisplayPartImage.setDefaultWidget(widget);
@@ -650,6 +703,7 @@ void SkeletonPartTreeWidget::addComponentChildrenToItem(QUuid componentId, QTree
             item->setFlags(item->flags() & ~(Qt::ItemIsEditable | Qt::ItemIsEnabled | Qt::ItemIsSelectable));
             QUuid partId = component->linkToPartId;
             SkeletonPartWidget *widget = new SkeletonPartWidget(m_document, partId);
+            widget->previewWidget()->setGraphicsFunctions(this);
             item->setSizeHint(0, SkeletonPartWidget::preferredSize());
             setItemWidget(item, 0, widget);
             widget->reload();
diff --git a/src/skeletonparttreewidget.h b/src/skeletonparttreewidget.h
index 5a3a5928..1fb8c6e0 100644
--- a/src/skeletonparttreewidget.h
+++ b/src/skeletonparttreewidget.h
@@ -4,10 +4,9 @@
 #include <QUuid>
 #include <QMouseEvent>
 #include "skeletondocument.h"
+#include "skeletongraphicswidget.h"
 
-class SkeletonGraphicsFunctions;
-
-class SkeletonPartTreeWidget : public QTreeWidget
+class SkeletonPartTreeWidget : public QTreeWidget, public SkeletonGraphicsFunctions
 {
     Q_OBJECT
 signals:
@@ -74,6 +73,12 @@ protected:
     virtual QSize sizeHint() const;
     virtual void mousePressEvent(QMouseEvent *event);
     virtual void keyPressEvent(QKeyEvent *event);
+    bool mouseMove(QMouseEvent *event);
+    bool wheel(QWheelEvent *event);
+    bool mouseRelease(QMouseEvent *event);
+    bool mousePress(QMouseEvent *event);
+    bool mouseDoubleClick(QMouseEvent *event);
+    bool keyPress(QKeyEvent *event);
 private:
     void addComponentChildrenToItem(QUuid componentId, QTreeWidgetItem *parentItem);
     void deleteItemChildren(QTreeWidgetItem *item);
diff --git a/src/skeletonpartwidget.cpp b/src/skeletonpartwidget.cpp
index 44572d9d..24013026 100644
--- a/src/skeletonpartwidget.cpp
+++ b/src/skeletonpartwidget.cpp
@@ -52,8 +52,10 @@ SkeletonPartWidget::SkeletonPartWidget(const SkeletonDocument *document, QUuid p
     m_wrapButton->setSizePolicy(retainSizePolicy);
     initButton(m_wrapButton);
     
-    m_previewLabel = new QLabel;
-    m_previewLabel->setFixedSize(Theme::previewImageSize, Theme::previewImageSize);
+    m_previewWidget = new ModelWidget;
+    m_previewWidget->enableMove(false);
+    m_previewWidget->enableZoom(false);
+    m_previewWidget->setFixedSize(Theme::previewImageSize, Theme::previewImageSize);
     
     QWidget *hrLightWidget = new QWidget;
     hrLightWidget->setFixedHeight(1);
@@ -89,7 +91,7 @@ SkeletonPartWidget::SkeletonPartWidget(const SkeletonDocument *document, QUuid p
     previewAndToolsLayout->setSpacing(0);
     previewAndToolsLayout->setContentsMargins(0, 0, 0, 0);
     previewAndToolsLayout->addWidget(m_visibleButton);
-    previewAndToolsLayout->addWidget(m_previewLabel);
+    previewAndToolsLayout->addWidget(m_previewWidget);
     previewAndToolsLayout->addLayout(toolsLayout);
     previewAndToolsLayout->setStretch(0, 0);
     previewAndToolsLayout->setStretch(1, 0);
@@ -229,6 +231,11 @@ SkeletonPartWidget::SkeletonPartWidget(const SkeletonDocument *document, QUuid p
     updateAllButtons();
 }
 
+ModelWidget *SkeletonPartWidget::previewWidget()
+{
+    return m_previewWidget;
+}
+
 QSize SkeletonPartWidget::preferredSize()
 {
     return QSize(Theme::miniIconSize + Theme::previewImageSize + Theme::miniIconSize * 4 + 5 + 2, Theme::previewImageSize + 6);
@@ -408,7 +415,9 @@ void SkeletonPartWidget::updatePreview()
         qDebug() << "Part not found:" << m_partId;
         return;
     }
-    m_previewLabel->setPixmap(QPixmap::fromImage(part->preview));
+    //m_previewLabel->setPixmap(QPixmap::fromImage(part->preview));
+    MeshLoader *previewMesh = part->takePreviewMesh();
+    m_previewWidget->updateMesh(previewMesh);
 }
 
 void SkeletonPartWidget::updateLockButton()
diff --git a/src/skeletonpartwidget.h b/src/skeletonpartwidget.h
index af2b9387..d1bee77e 100644
--- a/src/skeletonpartwidget.h
+++ b/src/skeletonpartwidget.h
@@ -4,6 +4,7 @@
 #include <QPushButton>
 #include <QMouseEvent>
 #include "skeletondocument.h"
+#include "modelwidget.h"
 
 class SkeletonPartWidget : public QWidget
 {
@@ -44,6 +45,7 @@ public:
     void updateWrapButton();
     void updateCheckedState(bool checked);
     static QSize preferredSize();
+    ModelWidget *previewWidget();
 protected:
     void mouseDoubleClickEvent(QMouseEvent *event);
 public slots:
@@ -53,7 +55,7 @@ private: // need initialize
     const SkeletonDocument *m_document;
     QUuid m_partId;
 private:
-    QLabel *m_previewLabel;
+    ModelWidget *m_previewWidget;
     QPushButton *m_visibleButton;
     QPushButton *m_lockButton;
     QPushButton *m_subdivButton;
@@ -64,7 +66,6 @@ private:
     QPushButton *m_roundButton;
     QPushButton *m_colorButton;
     QPushButton *m_wrapButton;
-    QLabel *m_nameLabel;
     QWidget *m_backgroundWidget;
 private:
     void initToolButton(QPushButton *button);