diff --git a/ArchitectureColoredPainting/src/Library/LibraryWidget.cpp b/ArchitectureColoredPainting/src/Library/LibraryWidget.cpp
index 03b4fa7..41990c7 100644
--- a/ArchitectureColoredPainting/src/Library/LibraryWidget.cpp
+++ b/ArchitectureColoredPainting/src/Library/LibraryWidget.cpp
@@ -5,6 +5,7 @@
 #include <QJsonDocument>
 #include <QJsonObject>
 #include "../util/PaintingUtil.h"
+#include <QStackedwidget>
 
 using namespace Library;
 
@@ -20,8 +21,6 @@ LibraryWidget::LibraryWidget(QWidget* parent)
 	connect(ui.classComboBox, &QComboBox::textActivated, this, &LibraryWidget::onClassChanged);
 
 	Renderer::PaintingRenderer::instance();
-
-	onClassChanged(ui.classComboBox->currentText());
 }
 
 QSize LibraryWidget::getPaintingAdjustedSize(const QString& path)
@@ -103,3 +102,13 @@ void Library::LibraryWidget::onClassChanged(const QString& name)
 
 	loadingThread = std::jthread([this](std::stop_token stop) {loadIcons(stop); });
 }
+
+void Library::LibraryWidget::currentTabChanged(int index)
+{
+	static bool firstChange = true;
+	if (qobject_cast<QStackedWidget*>(sender())->currentWidget() == this && firstChange)
+	{
+		onClassChanged(ui.classComboBox->currentText());
+		firstChange = false;
+	}
+}
diff --git a/ArchitectureColoredPainting/src/Library/LibraryWidget.h b/ArchitectureColoredPainting/src/Library/LibraryWidget.h
index 35681fb..f0746dc 100644
--- a/ArchitectureColoredPainting/src/Library/LibraryWidget.h
+++ b/ArchitectureColoredPainting/src/Library/LibraryWidget.h
@@ -29,6 +29,9 @@ namespace Library
 
 		LibraryWidget(QWidget* parent = nullptr);
 
+	public slots:
+		void currentTabChanged(int index);
+
 	signals:
 		void openPaintingFile(QString path);
 
diff --git a/ArchitectureColoredPainting/src/MainWindow.cpp b/ArchitectureColoredPainting/src/MainWindow.cpp
index c5f04d0..c144e7c 100644
--- a/ArchitectureColoredPainting/src/MainWindow.cpp
+++ b/ArchitectureColoredPainting/src/MainWindow.cpp
@@ -20,7 +20,8 @@ CentralWidget::CentralWidget(QWidget* parent) : QWidget(parent)
 	NavigationBarWidget* navigationBarWidget = new NavigationBarWidget(this);
 	ui.gridLayout->addWidget(navigationBarWidget, 0, 0, 1, 1, Qt::AlignTop | Qt::AlignHCenter);
 	QObject::connect(navigationBarWidget->tabs, &QtMaterialTabs::currentChanged, ui.stackedWidget, &QStackedWidget::setCurrentIndex);
-	QObject::connect(ui.stackedWidget, &QStackedWidget::currentChanged,	ui.rendererWidget, &Renderer::RendererWidget::currentTabChanged);
+	QObject::connect(ui.stackedWidget, &QStackedWidget::currentChanged, ui.rendererWidget, &Renderer::RendererWidget::currentTabChanged);
+	QObject::connect(ui.stackedWidget, &QStackedWidget::currentChanged, ui.libraryWidget, &Library::LibraryWidget::currentTabChanged);
 	QObject::connect(ui.rendererWidget, &Renderer::RendererWidget::openPaintingFile, [&, navigationBarWidget](QString path) {
 		navigationBarWidget->tabs->setCurrentTab(0);
 		ui.stackedWidget->setCurrentWidget(ui.editorWidget);
diff --git a/ArchitectureColoredPainting/src/Renderer/Light.cpp b/ArchitectureColoredPainting/src/Renderer/Light.cpp
index 257d70e..1780035 100644
--- a/ArchitectureColoredPainting/src/Renderer/Light.cpp
+++ b/ArchitectureColoredPainting/src/Renderer/Light.cpp
@@ -5,6 +5,12 @@ Light::Light(Camera* camera)
 	: camera(camera)
 	//, shadowCascadeLevels{ camera->FarPlane / 25.0f, camera->FarPlane / 12.0f, camera->FarPlane / 6.0f, camera->FarPlane / 3.0f }
 {
+	updateShadowCascadeLevels();
+}
+
+void Renderer::Light::updateShadowCascadeLevels()
+{
+	shadowCascadeLevels.clear();
 	const float levelCount = 5;
 	const float lambda = 0.5;
 	for (int i = 1; i < levelCount; i++)
diff --git a/ArchitectureColoredPainting/src/Renderer/Light.h b/ArchitectureColoredPainting/src/Renderer/Light.h
index 4177898..679fc8b 100644
--- a/ArchitectureColoredPainting/src/Renderer/Light.h
+++ b/ArchitectureColoredPainting/src/Renderer/Light.h
@@ -20,6 +20,7 @@ namespace Renderer
         std::vector<float> frustumSizes;
         Model* model = nullptr;
         Light(Camera* camera);
+        void updateShadowCascadeLevels();
         std::vector<QVector4D> getFrustumCornersWorldSpace(const QMatrix4x4& projview);
         std::vector<QVector4D> getFrustumCornersWorldSpace(const QMatrix4x4& proj, const QMatrix4x4& view);
         QMatrix4x4 getLightSpaceMatrix(const float nearPlane, const float farPlane);
diff --git a/ArchitectureColoredPainting/src/Renderer/Model.h b/ArchitectureColoredPainting/src/Renderer/Model.h
index c90060f..24eb8e1 100644
--- a/ArchitectureColoredPainting/src/Renderer/Model.h
+++ b/ArchitectureColoredPainting/src/Renderer/Model.h
@@ -19,6 +19,8 @@ namespace Renderer
 
 
 		std::vector<QVector3D> AABB;
+		glm::vec3 minPos = glm::vec3(std::numeric_limits<float>::max());
+		glm::vec3 maxPos = glm::vec3(std::numeric_limits<float>::min());
 	private:
 		QOpenGLContext* context = nullptr;
 		QOpenGLFunctions_4_5_Core* glFunc = nullptr;
@@ -38,9 +40,7 @@ namespace Renderer
 
 		QDir directory; /// 模型所在路径
 		QString name; /// 模型文件名
-
-		glm::vec3 minPos = glm::vec3(std::numeric_limits<float>::max());
-		glm::vec3 maxPos = glm::vec3(std::numeric_limits<float>::min());
+		
 
 		/// 递归遍历结点
 		void processNode(aiNode* node, const aiScene* scene, aiMatrix4x4 mat4 = aiMatrix4x4());
diff --git a/ArchitectureColoredPainting/src/Renderer/RendererGLWidget.cpp b/ArchitectureColoredPainting/src/Renderer/RendererGLWidget.cpp
index 35421cc..3245753 100644
--- a/ArchitectureColoredPainting/src/Renderer/RendererGLWidget.cpp
+++ b/ArchitectureColoredPainting/src/Renderer/RendererGLWidget.cpp
@@ -84,8 +84,12 @@ void RendererGLWidget::setModel(QString path)
 	//model->loadModel("Models/Sponza/Sponza.gltf");
 	//model->loadModel("E:\\3D Objects\\Gate\\gltf\\Gate.gltf");
 	model->loadModel(path);
-	light.model = model;
 	qDebug() << model->AABB;
+	light.model = model;
+	auto extent = model->maxPos - model->minPos;
+	camera.FarPlane = glm::sqrt(extent.x * extent.x + extent.y * extent.y + extent.z * extent.z);
+	camera.NearPlane = camera.FarPlane / 500.f;
+	light.updateShadowCascadeLevels();
 	doneCurrent();
 }
 
@@ -689,6 +693,10 @@ void RendererGLWidget::keyPressEvent(QKeyEvent* event)
 {
 	if (event->key() == Qt::Key_Escape)
 		clearFocus();
+	else if (event->key() == Qt::Key_Up)
+		camera.MovementSpeed += 50;
+	else if (event->key() == Qt::Key_Down)
+		camera.MovementSpeed = glm::max(50.f, camera.MovementSpeed - 50);
 	else if (!event->isAutoRepeat())
 		pressedKeys.insert(event->key());
 	QOpenGLWidget::keyPressEvent(event);