diff --git a/src/osgqt/GraphicsWindowQt.cpp b/src/osgqt/GraphicsWindowQt.cpp
index e40d626c..bec3fbfe 100644
--- a/src/osgqt/GraphicsWindowQt.cpp
+++ b/src/osgqt/GraphicsWindowQt.cpp
@@ -850,19 +850,22 @@ bool GraphicsWindowQt::releaseContextImplementation()
 
 void GraphicsWindowQt::swapBuffersImplementation()
 {
-    _widget->swapBuffers();
+	if (_widget->isVisible())
+	{
+		_widget->swapBuffers();
 
-    // FIXME: the processDeferredEvents should really be executed in a GUI (main) thread context but
-    // I couln't find any reliable way to do this. For now, lets hope non of *GUI thread only operations* will
-    // be executed in a QGLWidget::event handler. On the other hand, calling GUI only operations in the
-    // QGLWidget event handler is an indication of a Qt bug.
-    if (_widget->getNumDeferredEvents() > 0)
-        _widget->processDeferredEvents();
+		// FIXME: the processDeferredEvents should really be executed in a GUI (main) thread context but
+		// I couln't find any reliable way to do this. For now, lets hope non of *GUI thread only operations* will
+		// be executed in a QGLWidget::event handler. On the other hand, calling GUI only operations in the
+		// QGLWidget event handler is an indication of a Qt bug.
+		if (_widget->getNumDeferredEvents() > 0)
+			_widget->processDeferredEvents();
 
-    // We need to call makeCurrent here to restore our previously current context
-    // which may be changed by the processDeferredEvents function.
-    if (QGLContext::currentContext() != _widget->context())
-        _widget->makeCurrent();
+		// We need to call makeCurrent here to restore our previously current context
+		// which may be changed by the processDeferredEvents function.
+		if (QGLContext::currentContext() != _widget->context())
+			_widget->makeCurrent();
+	}
 }
 
 void GraphicsWindowQt::requestWarpPointer( float x, float y )
diff --git a/src/viewer/OsgWidget.cpp b/src/viewer/OsgWidget.cpp
index 1200f786..1c190217 100644
--- a/src/viewer/OsgWidget.cpp
+++ b/src/viewer/OsgWidget.cpp
@@ -206,6 +206,15 @@ void OsgWidget::paintEvent(QPaintEvent*) {
     frame();
 }
 
+void OsgWidget::showEvent(QShowEvent * event)
+{
+	if (nullptr == view_) {
+		return;
+	}
+	qreal devicePixelRatio = screen()->devicePixelRatio();
+	viewUI_->Resize(size().width() * devicePixelRatio, size().height() * devicePixelRatio);
+}
+
 void OsgWidget::dragEnterEvent(QDragEnterEvent* event) {
     LOG_INFO("OsgWidget::dragEnterEvent - Available formats:{}", event->mimeData()->formats().join(",").toStdString());
     
@@ -279,6 +288,11 @@ void OsgWidget::OnPresetModelDropped(const QString& modelType, const QString& mo
         height = 0.0;
     }
 
+	if (height < 0.0)
+	{
+		height = 0.0;
+	}	
+
     bool success = false;
     ModelInfo modelInfo = PresetModelConfigParser::Get().GetModelInfo(modelType, modelName, &success);
     if (!success) {
diff --git a/src/viewer/OsgWidget.h b/src/viewer/OsgWidget.h
index bb973ae4..2b5c8d75 100644
--- a/src/viewer/OsgWidget.h
+++ b/src/viewer/OsgWidget.h
@@ -28,6 +28,8 @@ protected:
     
     void resizeEvent(QResizeEvent* event) override;
     void paintEvent( QPaintEvent* /*event*/ ) override;
+
+	virtual void showEvent(QShowEvent *event) override;
     
     // 拖拽事件处理
     void dragEnterEvent(QDragEnterEvent* event) override;