diff --git a/src/document.cpp b/src/document.cpp
index a467297d..7d458d88 100644
--- a/src/document.cpp
+++ b/src/document.cpp
@@ -16,6 +16,7 @@
 #include "skeletonside.h"
 #include "scriptrunner.h"
 #include "mousepicker.h"
+#include "imageforever.h"
 
 unsigned long Document::m_maxSnapshot = 1000;
 
@@ -70,7 +71,7 @@ Document::Document() :
     m_isMouseTargetResultObsolete(false),
     m_paintMode(PaintMode::None),
     m_mousePickRadius(0.2),
-    m_saveNextSnapshot(false)
+    m_saveNextPaintSnapshot(false)
 {
     connect(&Preferences::instance(), &Preferences::partColorChanged, this, &Document::applyPreferencePartColorChange);
     connect(&Preferences::instance(), &Preferences::flatShadingChanged, this, &Document::applyPreferenceFlatShadingChange);
@@ -1998,15 +1999,16 @@ void Document::mouseTargetReady()
         if (changedPartIds.find(partId) == changedPartIds.end())
             continue;
         const auto &imageId = it.second;
+        m_intermediatePaintImageIds.insert(imageId);
         setPartDeformMapImageId(partId, imageId);
     }
     
     delete m_mousePicker;
     m_mousePicker = nullptr;
     
-    if (!m_isMouseTargetResultObsolete && m_saveNextSnapshot) {
-        m_saveNextSnapshot = false;
-        saveSnapshot();
+    if (!m_isMouseTargetResultObsolete && m_saveNextPaintSnapshot) {
+        m_saveNextPaintSnapshot = false;
+        stopPaint();
     }
     
     emit mouseTargetChanged();
@@ -2613,8 +2615,8 @@ void Document::setPartDeformMapImageId(QUuid partId, QUuid imageId)
         qDebug() << "Part not found:" << partId;
         return;
     }
-    //if (part->second.deformMapImageId == imageId)
-    //    return;
+    if (part->second.deformMapImageId == imageId)
+        return;
     part->second.deformMapImageId = imageId;
     part->second.dirty = true;
     emit partDeformMapImageIdChanged(partId);
@@ -3669,13 +3671,25 @@ const QString &Document::scriptConsoleLog() const
     return m_scriptConsoleLog;
 }
 
-void Document::saveNextSnapshot(void)
+void Document::startPaint(void)
+{
+}
+
+void Document::stopPaint(void)
 {
     if (m_mousePicker || m_isMouseTargetResultObsolete) {
-        m_saveNextSnapshot = true;
+        m_saveNextPaintSnapshot = true;
         return;
     }
     saveSnapshot();
+    for (const auto &it: partMap) {
+        m_intermediatePaintImageIds.erase(it.second.deformMapImageId);
+    }
+    for (const auto &it: m_intermediatePaintImageIds) {
+        //qDebug() << "Remove intermediate image:" << it;
+        ImageForever::remove(it);
+    }
+    m_intermediatePaintImageIds.clear();
 }
 
 void Document::setMousePickMaskNodeIds(const std::set<QUuid> &nodeIds)
diff --git a/src/document.h b/src/document.h
index 3149cb89..0b1eabc8 100644
--- a/src/document.h
+++ b/src/document.h
@@ -678,7 +678,8 @@ public slots:
     void scriptResultReady();
     void updateVariable(const QString &name, const std::map<QString, QString> &value);
     void updateVariableValue(const QString &name, const QString &value);
-    void saveNextSnapshot(void);
+    void startPaint(void);
+    void stopPaint(void);
     void setMousePickMaskNodeIds(const std::set<QUuid> &nodeIds);
 private:
     void splitPartByNode(std::vector<std::vector<QUuid>> *groups, QUuid nodeId);
@@ -738,7 +739,7 @@ private: // need initialize
     bool m_isMouseTargetResultObsolete;
     PaintMode m_paintMode;
     float m_mousePickRadius;
-    bool m_saveNextSnapshot;
+    bool m_saveNextPaintSnapshot;
 private:
     static unsigned long m_maxSnapshot;
     std::deque<HistoryItem> m_undoItems;
@@ -752,6 +753,7 @@ private:
     QString m_scriptConsoleLog;
     QString m_script;
     std::set<QUuid> m_mousePickMaskNodeIds;
+    std::set<QUuid> m_intermediatePaintImageIds;
 };
 
 #endif
diff --git a/src/documentwindow.cpp b/src/documentwindow.cpp
index 982b52b9..957234d0 100644
--- a/src/documentwindow.cpp
+++ b/src/documentwindow.cpp
@@ -293,6 +293,7 @@ DocumentWindow::DocumentWindow() :
         m_document->pickMouseTarget(nearPosition, farPosition);
     });
     connect(m_modelRenderWidget, &ModelWidget::mousePressed, m_document, [=]() {
+        m_document->startPaint();
         if (QGuiApplication::queryKeyboardModifiers().testFlag(Qt::ShiftModifier))
             m_document->setPaintMode(PaintMode::Push);
         else
@@ -300,7 +301,7 @@ DocumentWindow::DocumentWindow() :
     });
     connect(m_modelRenderWidget, &ModelWidget::mouseReleased, m_document, [=]() {
         m_document->setPaintMode(PaintMode::None);
-        m_document->saveNextSnapshot();
+        m_document->stopPaint();
     });
     connect(m_modelRenderWidget, &ModelWidget::addMouseRadius, m_document, [=](float radius) {
         m_document->setMousePickRadius(m_document->mousePickRadius() + radius);
diff --git a/src/imageforever.cpp b/src/imageforever.cpp
index e397104e..57e67c52 100644
--- a/src/imageforever.cpp
+++ b/src/imageforever.cpp
@@ -11,7 +11,6 @@ struct ImageForeverItem
     QByteArray *imageByteArray;
 };
 static std::map<QUuid, ImageForeverItem> g_foreverMap;
-static std::map<qint64, QUuid> g_foreverCacheKeyToIdMap;
 static QMutex g_mapMutex;
 
 const QImage *ImageForever::get(const QUuid &id)
@@ -23,6 +22,15 @@ const QImage *ImageForever::get(const QUuid &id)
     return findResult->second.image;
 }
 
+void ImageForever::copy(const QUuid &id, QImage &image)
+{
+    QMutexLocker locker(&g_mapMutex);
+    auto findResult = g_foreverMap.find(id);
+    if (findResult == g_foreverMap.end())
+        return;
+    image = *findResult->second.image;
+}
+
 const QByteArray *ImageForever::getPngByteArray(const QUuid &id)
 {
     QMutexLocker locker(&g_mapMutex);
@@ -37,11 +45,6 @@ QUuid ImageForever::add(const QImage *image, QUuid toId)
     QMutexLocker locker(&g_mapMutex);
     if (nullptr == image)
         return QUuid();
-    auto key = image->cacheKey();
-    auto findResult = g_foreverCacheKeyToIdMap.find(key);
-    if (findResult != g_foreverCacheKeyToIdMap.end()) {
-        return findResult->second;
-    }
     QUuid newId = toId.isNull() ? QUuid::createUuid() : toId;
     if (g_foreverMap.find(newId) != g_foreverMap.end())
         return newId;
@@ -51,6 +54,16 @@ QUuid ImageForever::add(const QImage *image, QUuid toId)
     pngBuffer.open(QIODevice::WriteOnly);
     newImage->save(&pngBuffer, "PNG");
     g_foreverMap[newId] = {newImage, newId, imageByteArray};
-    g_foreverCacheKeyToIdMap[newImage->cacheKey()] = newId;
     return newId;
 }
+
+void ImageForever::remove(const QUuid &id)
+{
+    QMutexLocker locker(&g_mapMutex);
+    auto findImage = g_foreverMap.find(id);
+    if (findImage == g_foreverMap.end())
+        return;
+    delete findImage->second.image;
+    delete findImage->second.imageByteArray;
+    g_foreverMap.erase(id);
+}
diff --git a/src/imageforever.h b/src/imageforever.h
index e843f650..709e55b7 100644
--- a/src/imageforever.h
+++ b/src/imageforever.h
@@ -8,8 +8,10 @@ class ImageForever
 {
 public:
     static const QImage *get(const QUuid &id);
+    static void copy(const QUuid &id, QImage &image);
     static const QByteArray *getPngByteArray(const QUuid &id);
     static QUuid add(const QImage *image, QUuid toId=QUuid());
+    static void remove(const QUuid &id);
 };
 
 #endif
diff --git a/src/meshgenerator.cpp b/src/meshgenerator.cpp
index d4d199ea..81638fa2 100644
--- a/src/meshgenerator.cpp
+++ b/src/meshgenerator.cpp
@@ -362,10 +362,13 @@ nodemesh::Combiner::Mesh *MeshGenerator::combinePartMesh(const QString &partIdSt
         deformWidth = widthString.toFloat();
     }
     
+    QImage deformImageStruct;
     const QImage *deformImage = nullptr;
     QString deformMapImageIdString = valueOfKeyInMapOrEmpty(part, "deformMapImageId");
     if (!deformMapImageIdString.isEmpty()) {
-        deformImage = ImageForever::get(QUuid(deformMapImageIdString));
+        ImageForever::copy(QUuid(deformMapImageIdString), deformImageStruct);
+        if (!deformImageStruct.isNull())
+            deformImage = &deformImageStruct;
         if (nullptr == deformImage) {
             qDebug() << "Deform image id not found:" << deformMapImageIdString;
         }
diff --git a/thirdparty/nodemesh/nodemesh/builder.cpp b/thirdparty/nodemesh/nodemesh/builder.cpp
index a0abc936..c54a8958 100644
--- a/thirdparty/nodemesh/nodemesh/builder.cpp
+++ b/thirdparty/nodemesh/nodemesh/builder.cpp
@@ -1038,6 +1038,8 @@ void Builder::applyDeform()
             float degrees = degreeBetweenIn360(node.baseNormal, ray.normalized(), node.traverseDirection);
             int x = node.reversedTraverseOrder * m_deformMapImage->width() / m_nodes.size();
             int y = degrees * m_deformMapImage->height() / 360.0;
+            if (y >= m_deformMapImage->height())
+                y = m_deformMapImage->height() - 1;
             float gray = (float)(qGray(m_deformMapImage->pixelColor(x, y).rgb()) - 127) / 127;
             position += m_deformMapScale * gray * ray;
             ray = position - node.position;