diff --git a/src/main.cpp b/src/main.cpp
index bcd16e34..1fceb064 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,6 +1,7 @@
 #include <QApplication>
 #include <QDesktopWidget>
 #include <QStyleFactory>
+#include <QFontDatabase>
 #include "mainwindow.h"
 #include "meshlite.h"
 
@@ -30,6 +31,9 @@ int main(int argc, char ** argv)
     
     QCoreApplication::setApplicationName("Dust 3D");
     
+    const QFont fixedFont = QFontDatabase::systemFont(QFontDatabase::FixedFont);
+    QApplication::setFont(fixedFont);
+    
     MainWindow mainWindow;
     mainWindow.showMaximized();
     return app.exec();
diff --git a/src/mainwindow.cpp b/src/mainwindow.cpp
index 5c6e03ca..5c6be9c9 100644
--- a/src/mainwindow.cpp
+++ b/src/mainwindow.cpp
@@ -149,6 +149,7 @@ void MainWindow::loadModel()
             }
         }
     }
+    m_skeletonWidget->graphicsView()->turnOffAddNodeMode();
 }
 
 void MainWindow::saveModel()
diff --git a/src/skeletoneditgraphicsview.cpp b/src/skeletoneditgraphicsview.cpp
index e79ce62a..ea01a3ba 100644
--- a/src/skeletoneditgraphicsview.cpp
+++ b/src/skeletoneditgraphicsview.cpp
@@ -116,6 +116,60 @@ float SkeletonEditGraphicsView::findXForSlave(float x)
     return x - m_backgroundItem->boundingRect().width() / 4;
 }
 
+void SkeletonEditGraphicsView::removeSelectedItems()
+{
+    if (m_nextStartNodeItem) {
+        SkeletonEditNodeItem *nodeItem = m_nextStartNodeItem;
+        setNextStartNodeItem(NULL);
+        removeNodeItem(nodeItem);
+        emit nodesChanged();
+    }
+}
+
+void SkeletonEditGraphicsView::removeNodeItem(SkeletonEditNodeItem *nodeItem)
+{
+    if (nodeItem->pair()) {
+        scene()->removeItem(nodeItem->pair());
+    }
+    scene()->removeItem(nodeItem);
+    QList<QGraphicsItem *>::iterator it;
+    QList<QGraphicsItem *> list = scene()->items();
+    for (it = list.begin(); it != list.end(); ++it) {
+        if ((*it)->data(0).toString() == "edge") {
+            SkeletonEditEdgeItem *edgeItem = static_cast<SkeletonEditEdgeItem *>(*it);
+            if (edgeItem->firstNode() == nodeItem || edgeItem->secondNode() == nodeItem) {
+                scene()->removeItem(edgeItem);
+            }
+        }
+    }
+}
+
+void SkeletonEditGraphicsView::removeGroupByNodeItem(SkeletonEditNodeItem *nodeItem)
+{
+    if (nodeItem->pair()) {
+        scene()->removeItem(nodeItem->pair());
+    }
+    scene()->removeItem(nodeItem);
+    QList<QGraphicsItem *>::iterator it;
+    QList<QGraphicsItem *> list = scene()->items();
+    std::vector<SkeletonEditNodeItem *> delayRemoveList;
+    for (it = list.begin(); it != list.end(); ++it) {
+        if ((*it)->data(0).toString() == "edge") {
+            SkeletonEditEdgeItem *edgeItem = static_cast<SkeletonEditEdgeItem *>(*it);
+            if (edgeItem->firstNode() == nodeItem) {
+                scene()->removeItem(edgeItem);
+                delayRemoveList.push_back(edgeItem->secondNode());
+            } else if (edgeItem->secondNode() == nodeItem) {
+                scene()->removeItem(edgeItem);
+                delayRemoveList.push_back(edgeItem->firstNode());
+            }
+        }
+    }
+    for (size_t i = 0; i < delayRemoveList.size(); i++) {
+        removeNodeItem(delayRemoveList[i]);
+    }
+}
+
 void SkeletonEditGraphicsView::keyPressEvent(QKeyEvent *event)
 {
     QWidget::keyPressEvent(event);
@@ -123,6 +177,9 @@ void SkeletonEditGraphicsView::keyPressEvent(QKeyEvent *event)
         return;
     if (event->key() == Qt::Key_A)
         toggleAddNodeMode();
+    else if (event->key() == Qt::Key_Delete || event->key() ==Qt::Key_Backspace) {
+        removeSelectedItems();
+    }
 }
 
 void SkeletonEditGraphicsView::resizeEvent(QResizeEvent *event)
diff --git a/src/skeletoneditgraphicsview.h b/src/skeletoneditgraphicsview.h
index e0351605..b263407c 100644
--- a/src/skeletoneditgraphicsview.h
+++ b/src/skeletoneditgraphicsview.h
@@ -55,6 +55,9 @@ private:
     void AddItemRadius(QGraphicsEllipseItem *item, float delta);
     bool canAddItemRadius(QGraphicsEllipseItem *item, float delta);
     void adjustItems(QSizeF oldSceneSize, QSizeF newSceneSize);
+    void removeSelectedItems();
+    void removeNodeItem(SkeletonEditNodeItem *nodeItem);
+    void removeGroupByNodeItem(SkeletonEditNodeItem *nodeItem);
 };
 
 #endif
diff --git a/src/skeletontomesh.cpp b/src/skeletontomesh.cpp
index ee4d7f96..dcaea2d6 100644
--- a/src/skeletontomesh.cpp
+++ b/src/skeletontomesh.cpp
@@ -267,7 +267,7 @@ Mesh *SkeletonToMesh::takeResultMesh()
     return mesh;
 }
 
-#define USE_CARVE 0
+#define USE_CARVE 1
 
 #if USE_CARVE
 #define ExternalMesh                    carve::poly::Polyhedron
@@ -342,7 +342,6 @@ void SkeletonToMesh::process()
             meshlite_bmesh_add_edge(context, group->bmeshId, firstNode->bmeshNodeId, secondNode->bmeshNodeId);
         }
         group->meshId = meshlite_bmesh_generate_mesh(context, group->bmeshId, group->nodes[group->rootNode].bmeshNodeId);
-        group->meshId = meshlite_triangulate(context, group->meshId);
     }
     
     ExternalMesh *unionPolyhedron = makeExternalMeshFromMeshlite(context, m_groups[0].meshId);