diff --git a/application/sources/bone_generator.cc b/application/sources/bone_generator.cc
index 2ad920f9..5a1ffd4d 100644
--- a/application/sources/bone_generator.cc
+++ b/application/sources/bone_generator.cc
@@ -2,6 +2,11 @@
 #include <dust3d/mesh/smooth_normal.h>
 #include <dust3d/mesh/trim_vertices.h>
 
+std::map<dust3d::Uuid, std::unique_ptr<ModelMesh>>* BoneGenerator::takeBonePreviewMeshes()
+{
+    return m_bonePreviewMeshes.release();
+}
+
 void BoneGenerator::process()
 {
     generate();
diff --git a/application/sources/bone_generator.h b/application/sources/bone_generator.h
index 324b4076..39f045ea 100644
--- a/application/sources/bone_generator.h
+++ b/application/sources/bone_generator.h
@@ -4,10 +4,13 @@
 #include "model_mesh.h"
 #include <QObject>
 #include <dust3d/rig/bone_generator.h>
+#include <map>
 #include <memory>
 
 class BoneGenerator : public QObject, public dust3d::BoneGenerator {
     Q_OBJECT
+public:
+    std::map<dust3d::Uuid, std::unique_ptr<ModelMesh>>* takeBonePreviewMeshes();
 public slots:
     void process();
 signals:
diff --git a/application/sources/document.cc b/application/sources/document.cc
index e06257a4..5966f13d 100644
--- a/application/sources/document.cc
+++ b/application/sources/document.cc
@@ -1,4 +1,5 @@
 #include "document.h"
+#include "bone_generator.h"
 #include "image_forever.h"
 #include "mesh_generator.h"
 #include "mesh_result_post_processor.h"
@@ -2795,6 +2796,11 @@ bool Document::isTextureGenerating() const
     return nullptr != m_textureGenerator;
 }
 
+bool Document::isBoneGenerating() const
+{
+    return nullptr != m_boneGenerator;
+}
+
 void Document::copyNodes(std::set<dust3d::Uuid> nodeIdSet) const
 {
     dust3d::Snapshot snapshot;
@@ -2865,7 +2871,7 @@ void Document::addBone(const dust3d::Uuid& boneId)
         return;
 
     Bone bone(boneId);
-    boneMap.emplace(boneId, bone);
+    boneMap.emplace(boneId, std::move(bone));
     boneIdList.push_back(boneId);
     emit boneAdded(boneId);
     emit boneIdListChanged();
@@ -3018,3 +3024,66 @@ void Document::pickBoneNode(const dust3d::Uuid& nodeId)
 
     stopBoneJointsPicking();
 }
+
+void Document::generateBone()
+{
+    if (nullptr != m_boneGenerator) {
+        m_isResultBoneObsolete = true;
+        return;
+    }
+
+    m_isResultBoneObsolete = false;
+
+    emit boneGenerating();
+
+    // TODO:
+
+    QThread* thread = new QThread;
+    m_boneGenerator = std::make_unique<BoneGenerator>();
+    m_boneGenerator->moveToThread(thread);
+    connect(thread, &QThread::started, m_boneGenerator.get(), &BoneGenerator::process);
+    connect(m_boneGenerator.get(), &BoneGenerator::finished, this, &Document::boneReady);
+    connect(m_boneGenerator.get(), &BoneGenerator::finished, thread, &QThread::quit);
+    connect(thread, &QThread::finished, thread, &QThread::deleteLater);
+    thread->start();
+}
+
+void Document::boneReady()
+{
+    std::unique_ptr<std::map<dust3d::Uuid, std::unique_ptr<ModelMesh>>> bonePreviewMeshes;
+    bonePreviewMeshes.reset(m_boneGenerator->takeBonePreviewMeshes());
+    bool bonePreviewsChanged = bonePreviewMeshes && !bonePreviewMeshes->empty();
+    if (bonePreviewsChanged) {
+        for (auto& it : *bonePreviewMeshes) {
+            setBonePreviewMesh(it.first, std::move(it.second));
+        }
+        emit resultBonePreviewMeshesChanged();
+    }
+
+    // TODO:
+
+    m_boneGenerator.reset();
+
+    emit resultBoneChanged();
+
+    if (m_isResultBoneObsolete)
+        generateBone();
+}
+
+void Document::setBonePreviewMesh(const dust3d::Uuid& boneId, std::unique_ptr<ModelMesh> mesh)
+{
+    Document::Bone* bone = (Document::Bone*)findBone(boneId);
+    if (nullptr == bone)
+        return;
+    bone->updatePreviewMesh(std::move(mesh));
+    emit bonePreviewMeshChanged(boneId);
+}
+
+void Document::setBonePreviewPixmap(const dust3d::Uuid& boneId, const QPixmap& pixmap)
+{
+    Document::Bone* bone = (Document::Bone*)findBone(boneId);
+    if (nullptr == bone)
+        return;
+    bone->previewPixmap = pixmap;
+    emit bonePreviewPixmapChanged(boneId);
+}
diff --git a/application/sources/document.h b/application/sources/document.h
index e5410a19..70303683 100644
--- a/application/sources/document.h
+++ b/application/sources/document.h
@@ -24,6 +24,7 @@
 class UvMapGenerator;
 class MeshGenerator;
 class MeshResultPostProcessor;
+class BoneGenerator;
 
 class Document : public QObject {
     Q_OBJECT
@@ -208,8 +209,14 @@ public:
         std::vector<dust3d::Uuid> joints;
         QString name;
         QPixmap previewPixmap;
+        bool isPreviewMeshObsolete = false;
+        void updatePreviewMesh(std::unique_ptr<ModelMesh> mesh);
+        ModelMesh* takePreviewMesh() const;
 
         Bone(const dust3d::Uuid& withId = dust3d::Uuid());
+
+    private:
+        std::unique_ptr<ModelMesh> m_previewMesh;
     };
 
 signals:
@@ -218,6 +225,7 @@ signals:
     void partPreviewChanged(dust3d::Uuid partId);
     void resultMeshChanged();
     void resultComponentPreviewMeshesChanged();
+    void resultBonePreviewMeshesChanged();
     void turnaroundChanged();
     void editModeChanged();
     void resultTextureChanged();
@@ -288,9 +296,12 @@ signals:
     void boneNodesChanged(const dust3d::Uuid& boneId);
     void boneJointsChanged(const dust3d::Uuid& boneId);
     void boneNameChanged(const dust3d::Uuid& boneId);
+    void bonePreviewMeshChanged(const dust3d::Uuid& boneId);
     void bonePreviewPixmapChanged(const dust3d::Uuid& boneId);
     void boneIdListChanged();
     void rigChanged();
+    void boneGenerating();
+    void resultBoneChanged();
 
 public: // need initialize
     QImage* textureImage = nullptr;
@@ -359,6 +370,7 @@ public:
     bool isMeshGenerating() const;
     bool isPostProcessing() const;
     bool isTextureGenerating() const;
+    bool isBoneGenerating() const;
     void collectCutFaceList(std::vector<QString>& cutFaces) const;
     float getOriginX(bool rotated = false) const
     {
@@ -417,6 +429,8 @@ public:
     void resetDirtyFlags();
     void markAllDirty();
     const Bone* findBone(const dust3d::Uuid& boneId) const;
+    void setBonePreviewMesh(const dust3d::Uuid& boneId, std::unique_ptr<ModelMesh> mesh);
+    void setBonePreviewPixmap(const dust3d::Uuid& boneId, const QPixmap& pixmap);
 
 public slots:
     void undo();
@@ -435,6 +449,8 @@ public slots:
     void textureReady();
     void postProcess();
     void postProcessedMeshResultReady();
+    void generateBone();
+    void boneReady();
     void setPartSubdivState(dust3d::Uuid partId, bool subdived);
     void setPartXmirrorState(dust3d::Uuid partId, bool mirrored);
     void setPartDeformThickness(dust3d::Uuid partId, float thickness);
@@ -565,10 +581,14 @@ private:
     float m_originZ = 0;
     dust3d::Uuid m_currentCanvasComponentId;
     bool m_allPositionRelatedLocksEnabled = true;
+
     dust3d::Uuid m_currentBondId;
     size_t m_currentBoneJoints = 0;
     std::vector<dust3d::Uuid> m_currentBoneJointNodes;
 
+    std::unique_ptr<BoneGenerator> m_boneGenerator;
+    bool m_isResultBoneObsolete = false;
+
 private:
     static unsigned long m_maxSnapshot;
     std::deque<HistoryItem> m_undoItems;
diff --git a/application/sources/document_bone.cc b/application/sources/document_bone.cc
index a4743986..c4e3a76c 100644
--- a/application/sources/document_bone.cc
+++ b/application/sources/document_bone.cc
@@ -4,3 +4,16 @@ Document::Bone::Bone(const dust3d::Uuid& withId)
 {
     id = withId.isNull() ? dust3d::Uuid::createUuid() : withId;
 }
+
+void Document::Bone::updatePreviewMesh(std::unique_ptr<ModelMesh> mesh)
+{
+    m_previewMesh = std::move(mesh);
+    isPreviewMeshObsolete = true;
+}
+
+ModelMesh* Document::Bone::takePreviewMesh() const
+{
+    if (nullptr == m_previewMesh)
+        return nullptr;
+    return new ModelMesh(*m_previewMesh);
+}
diff --git a/application/sources/document_window.cc b/application/sources/document_window.cc
index 8ae28266..141c9688 100644
--- a/application/sources/document_window.cc
+++ b/application/sources/document_window.cc
@@ -208,6 +208,9 @@ DocumentWindow::DocumentWindow()
     connect(m_document, &Document::textureGenerating, this, &DocumentWindow::updateInprogressIndicator);
     connect(m_document, &Document::resultTextureChanged, this, &DocumentWindow::updateInprogressIndicator);
     connect(m_document, &Document::postProcessedResultChanged, this, &DocumentWindow::updateInprogressIndicator);
+    connect(m_document, &Document::boneGenerating, this, &DocumentWindow::updateInprogressIndicator);
+    connect(m_document, &Document::resultBoneChanged, this, &DocumentWindow::updateInprogressIndicator);
+    connect(m_document, &Document::resultBonePreviewMeshesChanged, this, &DocumentWindow::generateBonePreviewImages);
 
     toolButtonLayout->addWidget(addButton);
     toolButtonLayout->addWidget(selectButton);
@@ -616,6 +619,8 @@ DocumentWindow::DocumentWindow()
     connect(m_document, &Document::textureChanged, m_document, &Document::generateTexture);
     connect(m_document, &Document::resultMeshChanged, m_document, &Document::postProcess);
     connect(m_document, &Document::postProcessedResultChanged, m_document, &Document::generateTexture);
+    connect(m_document, &Document::rigChanged, m_document, &Document::generateBone);
+    connect(m_document, &Document::postProcessedResultChanged, m_document, &Document::generateBone);
     connect(m_document, &Document::resultTextureChanged, [=]() {
         if (m_document->isMeshGenerating())
             return;
@@ -677,7 +682,7 @@ DocumentWindow::DocumentWindow()
 
 void DocumentWindow::updateInprogressIndicator()
 {
-    bool inprogress = m_document->isMeshGenerating() || m_document->isPostProcessing() || m_document->isTextureGenerating() || nullptr != m_componentPreviewImagesGenerator || nullptr != m_componentPreviewImagesDecorator;
+    bool inprogress = m_document->isMeshGenerating() || m_document->isPostProcessing() || m_document->isTextureGenerating() || m_document->isBoneGenerating() || nullptr != m_componentPreviewImagesGenerator || nullptr != m_componentPreviewImagesDecorator;
     if (inprogress == m_inprogressIndicator->isSpinning())
         return;
     m_inprogressIndicator->showSpinner(inprogress);
@@ -1403,3 +1408,52 @@ void DocumentWindow::toggleRenderColor()
         mesh->removeColor();
     m_modelRenderWidget->updateMesh(mesh);
 }
+
+void DocumentWindow::generateBonePreviewImages()
+{
+    if (nullptr != m_bonePreviewImagesGenerator) {
+        m_isBonePreviewImagesObsolete = true;
+        return;
+    }
+
+    m_isBonePreviewImagesObsolete = false;
+
+    QThread* thread = new QThread;
+
+    m_bonePreviewImagesGenerator = new MeshPreviewImagesGenerator(new ModelOffscreenRender(m_modelRenderWidget->format()));
+    for (auto& bone : m_document->boneMap) {
+        if (!bone.second.isPreviewMeshObsolete)
+            continue;
+        bone.second.isPreviewMeshObsolete = false;
+        auto previewMesh = std::unique_ptr<ModelMesh>(bone.second.takePreviewMesh());
+        const bool useFrontView = false;
+        m_bonePreviewImagesGenerator->addInput(bone.first, std::move(previewMesh), useFrontView);
+    }
+    m_bonePreviewImagesGenerator->moveToThread(thread);
+    connect(thread, &QThread::started, m_bonePreviewImagesGenerator, &MeshPreviewImagesGenerator::process);
+    connect(m_bonePreviewImagesGenerator, &MeshPreviewImagesGenerator::finished, this, &DocumentWindow::bonePreviewImagesReady);
+    connect(m_bonePreviewImagesGenerator, &MeshPreviewImagesGenerator::finished, thread, &QThread::quit);
+    connect(thread, &QThread::finished, thread, &QThread::deleteLater);
+    thread->start();
+
+    updateInprogressIndicator();
+}
+
+void DocumentWindow::bonePreviewImagesReady()
+{
+    std::unique_ptr<std::map<dust3d::Uuid, QImage>> boneImages;
+    boneImages.reset(m_bonePreviewImagesGenerator->takeImages());
+    if (nullptr != boneImages) {
+        for (const auto& it : *boneImages) {
+            m_document->setBonePreviewPixmap(it.first, QPixmap::fromImage(it.second));
+        }
+    }
+
+    delete m_bonePreviewImagesGenerator;
+    m_bonePreviewImagesGenerator = nullptr;
+
+    if (m_isBonePreviewImagesObsolete)
+        generateBonePreviewImages();
+    else
+        updateInprogressIndicator();
+}
diff --git a/application/sources/document_window.h b/application/sources/document_window.h
index 469de06e..599d9922 100644
--- a/application/sources/document_window.h
+++ b/application/sources/document_window.h
@@ -90,6 +90,8 @@ public slots:
     void componentPreviewImagesReady();
     void decorateComponentPreviewImages();
     void componentPreviewImageDecorationsReady();
+    void generateBonePreviewImages();
+    void bonePreviewImagesReady();
     void updateInprogressIndicator();
     void openRecentFile();
     void updateRecentFileActions();
@@ -170,6 +172,9 @@ private:
     std::unique_ptr<ComponentPreviewImagesDecorator> m_componentPreviewImagesDecorator;
     bool m_isComponentPreviewImageDecorationsObsolete = false;
 
+    MeshPreviewImagesGenerator* m_bonePreviewImagesGenerator = nullptr;
+    bool m_isBonePreviewImagesObsolete = false;
+
     PartManageWidget* m_partManageWidget = nullptr;
     BoneManageWidget* m_boneManageWidget = nullptr;
 
diff --git a/dust3d/mesh/mesh_combiner.cc b/dust3d/mesh/mesh_combiner.cc
index 030943c3..13a8e217 100644
--- a/dust3d/mesh/mesh_combiner.cc
+++ b/dust3d/mesh/mesh_combiner.cc
@@ -24,7 +24,6 @@
 #include <dust3d/mesh/mesh_combiner.h>
 #include <dust3d/mesh/solid_mesh_boolean_operation.h>
 #include <dust3d/mesh/triangulate.h>
-#include <dust3d/util/obj.h>
 
 namespace dust3d {
 
diff --git a/dust3d/mesh/solid_mesh_boolean_operation.cc b/dust3d/mesh/solid_mesh_boolean_operation.cc
index 434c7554..f2378d36 100644
--- a/dust3d/mesh/solid_mesh_boolean_operation.cc
+++ b/dust3d/mesh/solid_mesh_boolean_operation.cc
@@ -25,7 +25,6 @@
 #include <dust3d/base/position_key.h>
 #include <dust3d/mesh/re_triangulator.h>
 #include <dust3d/mesh/solid_mesh_boolean_operation.h>
-#include <dust3d/util/obj.h>
 #include <queue>
 #include <set>
 #include <stdio.h>