diff --git a/QtMeshViewer/Header/OglViewerWidget.h b/QtMeshViewer/Header/OglViewerWidget.h
index 0480a09..8c43835 100644
--- a/QtMeshViewer/Header/OglViewerWidget.h
+++ b/QtMeshViewer/Header/OglViewerWidget.h
@@ -23,19 +23,19 @@ private:
 	QOpenGLShaderProgram m_program;
 	GeometryEngine *m_dataEngine;
 
-	QVector4D m_backgroundColorOn = { 0.02f, 0.02f, 0.02f, 1.0f };
-	QVector4D m_backgroundColorOff = { 0.5f, 0.8f, 1.0f, 1.0f };
+	QVector4D m_backgroundColorOn;
+	QVector4D m_backgroundColorOff;
 
-	bool m_wireframe = false;
-	bool m_lightOn = false;
-	bool m_backfaceCulling = false;
+	bool m_wireframe;
+	bool m_lightOn;
+	bool m_backfaceCulling;
 
 	struct {
-		QVector4D position = { 1,1,1,0 };
-		QVector3D intensities = { 1.0,1.0,1.0 };
-		float attenuationFactor = 0.0f;
-		float ambientCoefficient = 0.005f;
-		bool headlight = false;
+		QVector4D position;
+		QVector3D intensities;
+		float attenuationFactor;
+		float ambientCoefficient;
+		bool headlight;
 	} m_light;
 
 	struct {
@@ -51,6 +51,7 @@ private:
 
 // functions
 private:
+	void setDefaultValues();
 	void initShaders();
 	void resetView();
 	void updateLightPosition();
@@ -89,5 +90,10 @@ public slots:
 	void setHeadlight(bool value);
 	void setBackfaceCulling(bool value);
 
+// signals
+signals:
+	void lightChanged(bool value);
+
+
 };
 
diff --git a/QtMeshViewer/Header/SettingsManager.h b/QtMeshViewer/Header/SettingsManager.h
new file mode 100644
index 0000000..06ac7a7
--- /dev/null
+++ b/QtMeshViewer/Header/SettingsManager.h
@@ -0,0 +1,72 @@
+#pragma once
+#include <QObject>
+#include <QFile>
+#include <QVector3D>
+#include <QVector4D>
+
+
+class SettingsManager : public QObject
+{
+	Q_OBJECT
+
+private:
+	SettingsManager(QObject *parent = Q_NULLPTR);
+
+public:
+	SettingsManager(SettingsManager const&) = delete;
+	void operator=(SettingsManager const&) = delete;
+
+	~SettingsManager();
+
+	static SettingsManager* getInstance(QObject *parent = Q_NULLPTR);
+
+// attributes
+private:
+	QFile file;
+
+	QVector3D m_bgColorOn = { 5, 5, 5 };
+	QVector3D m_bgColorOff = { 128, 204, 255 };
+	bool m_bfCulling = false;
+	bool m_light = false;
+
+	int m_lightType = 1;	// 1 = direct, 2 = point
+	QVector3D m_lightColor = { 255,255,255 };
+	float m_attenuation = 0.0f;
+	float m_ambient = 0.005f;
+	bool m_headlight = false;
+	bool m_autoColor = true;
+
+// functions
+private:
+	void readFromFile();
+	void writeToFile();
+
+public:
+	QVector3D getBgColorOn() const;
+	QVector3D getBgColorOff() const;
+	bool isBfCulling() const;
+	bool isLight() const;
+
+	int getLightType() const;
+	QVector3D getLightColor() const;
+	float getAttenuation() const;
+	float getAmbient() const;
+	bool isHeadlight() const;
+	bool isAutoColor() const;
+
+
+// slots
+public:
+	void setBgColorOn(QVector3D value);
+	void setBgColorOff(QVector3D value);
+	void setBfCulling(bool value);
+	void setLight(bool value);
+
+	void setLightType(int value);
+	void setLightColor(QVector3D value);
+	void setAttenuation(double value);
+	void setAmbient(double value);
+	void setHeadlight(bool value);
+	void setAutoColor(int value);
+
+};
\ No newline at end of file
diff --git a/QtMeshViewer/Header/SettingsWindow.h b/QtMeshViewer/Header/SettingsWindow.h
index e7fe472..f2da665 100644
--- a/QtMeshViewer/Header/SettingsWindow.h
+++ b/QtMeshViewer/Header/SettingsWindow.h
@@ -9,7 +9,7 @@ class SettingsWindow : public QWidget
 	Q_OBJECT
 
 public:
-	SettingsWindow(QVector3D bgOffColor, QVector3D bgOnColor, QVector3D lightColor, bool autoColor, double ambCoef, double attFac, int lightType, QWidget * parent = Q_NULLPTR);
+	SettingsWindow(QWidget * parent = Q_NULLPTR);
 	~SettingsWindow();
 
 private:
@@ -33,5 +33,6 @@ signals:
 	void sendHeadlight(bool value);
 	void sendBackfaceCulling(bool value);
 	void sendZommSpeed(int percent);
+	void changeLightType(int value);
 	
 };
\ No newline at end of file
diff --git a/QtMeshViewer/Source/OglViewerWidget.cpp b/QtMeshViewer/Source/OglViewerWidget.cpp
index 9399da8..7f0c4f9 100644
--- a/QtMeshViewer/Source/OglViewerWidget.cpp
+++ b/QtMeshViewer/Source/OglViewerWidget.cpp
@@ -3,6 +3,7 @@
 #include "..\Header\FreeCamera.h"
 #include "..\Header\OrbitCamera.h"
 #include "..\Header\MoveCamera.h"
+#include "..\Header\SettingsManager.h"
 #include <QMouseEvent>
 #include <QDropEvent>
 #include <QMimeData>
@@ -24,7 +25,8 @@ OglViewerWidget::OglViewerWidget(QWidget *parent)
 	setAcceptDrops(true);
 
 	// settings window
-	m_settings = new SettingsWindow(m_backgroundColorOff.toVector3D() * 255, m_backgroundColorOn.toVector3D() * 255, m_light.intensities * 255, true, m_light.ambientCoefficient, m_light.attenuationFactor, 1, this);
+	setDefaultValues();
+	m_settings = new SettingsWindow(this);
 
 	connect(m_settings, &SettingsWindow::updateBGColorOff, this, &OglViewerWidget::setBGColorOff);
 	connect(m_settings, &SettingsWindow::updateBGColorOn, this, &OglViewerWidget::setBGColorOn);
@@ -52,6 +54,30 @@ OglViewerWidget::~OglViewerWidget()
 /////////////////////////////////////////////////////////////////////////
 // functions
 
+void OglViewerWidget::setDefaultValues()
+{
+	SettingsManager* sm = SettingsManager::getInstance(this);
+
+	m_backgroundColorOn = QVector4D(sm->getBgColorOn() / 255, 1.0f);
+	m_backgroundColorOff = QVector4D(sm->getBgColorOff() / 255, 1.0f);
+
+	m_wireframe = false;
+	m_lightOn = sm->isLight();
+	m_backfaceCulling = sm->isBfCulling();
+
+	if (sm->getLightType() == 1)	// directional
+		m_light.position = { 0.0,0.0,0.0,0.0 };
+	else						// point
+		m_light.position = { 0.0,0.0,0.0,1.0 };
+	m_light.intensities = sm->getLightColor() / 255;
+	m_light.attenuationFactor = sm->getAttenuation();
+	m_light.ambientCoefficient = sm->getAmbient();
+	m_light.headlight = sm->isHeadlight();
+
+	connect(this, &OglViewerWidget::lightChanged, sm, &SettingsManager::setLight);
+
+}
+
 void OglViewerWidget::initShaders()
 {
 	// Compile vertex shader
@@ -371,6 +397,8 @@ void OglViewerWidget::toggleLight()
 		m_backgroundColorOff[3] = 1.0;
 	}
 
+	emit lightChanged(m_lightOn);
+
 	update();
 }
 
diff --git a/QtMeshViewer/Source/SettingsManager.cpp b/QtMeshViewer/Source/SettingsManager.cpp
new file mode 100644
index 0000000..db3a623
--- /dev/null
+++ b/QtMeshViewer/Source/SettingsManager.cpp
@@ -0,0 +1,223 @@
+#include "..\Header\SettingsManager.h"
+
+#include <QDebug>
+
+/////////////////////////////////////////////////////////////////////////
+// constructor/destructor
+
+SettingsManager::SettingsManager(QObject *parent)
+	: QObject(parent)
+{
+	file.setFileName("meshviewer.config");
+	readFromFile();
+}
+
+SettingsManager::~SettingsManager()
+{
+	writeToFile();
+}
+
+SettingsManager* SettingsManager::getInstance(QObject *parent)
+{
+	static SettingsManager* instance = new SettingsManager(parent);
+	return instance;
+}
+
+
+/////////////////////////////////////////////////////////////////////////
+// functions
+
+void SettingsManager::readFromFile()
+{
+	if (file.open(QIODevice::ReadOnly))
+	{
+
+		QByteArray stream = file.readAll();
+		QList<QByteArray> lines = stream.split('\n');
+
+		for (auto& it : lines)
+		{
+			if (it.startsWith("<bgOn>"))
+			{
+				QList<QByteArray> values = it.right(it.size() - it.indexOf('>') - 1).split(';');
+
+				for (int i = 0; i < 3; i++)
+					m_bgColorOn[i] = values[i].toFloat();
+			}
+			else if (it.startsWith("<bgOff>"))
+			{
+				QList<QByteArray> values = it.right(it.size() - it.indexOf('>') - 1).split(';');
+
+				for (int i = 0; i < 3; i++)
+					m_bgColorOff[i] = values[i].toFloat();
+			}
+			else if (it.startsWith("<liCo>"))
+			{
+				QList<QByteArray> values = it.right(it.size() - it.indexOf('>') - 1).split(';');
+
+				for (int i = 0; i < 3; i++)
+					m_lightColor[i] = values[i].toFloat();
+			}
+			else if (it.startsWith("<bfCul>"))
+			{
+				m_bfCulling = it.right(it.size() - it.indexOf('>') - 1).toInt();
+			}
+			else if (it.startsWith("<liOn>"))
+			{
+				m_light = it.right(it.size() - it.indexOf('>') - 1).toInt();
+			}
+			else if (it.startsWith("<heLi>"))
+			{
+				m_headlight = it.right(it.size() - it.indexOf('>') - 1).toInt();
+			}
+			else if (it.startsWith("<auCo>"))
+			{
+				m_autoColor = it.right(it.size() - it.indexOf('>') - 1).toInt();
+			}
+			else if (it.startsWith("<liTy>"))
+			{
+				m_lightType = it.right(it.size() - it.indexOf('>') - 1).toInt();
+			}
+			else if (it.startsWith("<atFa>"))
+			{
+				m_attenuation = it.right(it.size() - it.indexOf('>') - 1).toFloat();
+			}
+			else if (it.startsWith("<amCo>"))
+			{
+				m_ambient = it.right(it.size() - it.indexOf('>') - 1).toFloat();
+			}
+
+		}
+		file.close();
+	}
+}
+
+void SettingsManager::writeToFile()
+{
+	file.open(QIODevice::WriteOnly);
+
+	file.write(QString("<bgOn>%1;%2;%3\n").arg(m_bgColorOn.x()).arg(m_bgColorOn.y()).arg(m_bgColorOn.z()).toUtf8());
+	file.write(QString("<bgOff>%1;%2;%3\n").arg(m_bgColorOff.x()).arg(m_bgColorOff.y()).arg(m_bgColorOff.z()).toUtf8());
+	file.write(QString("<liCo>%1;%2;%3\n").arg(m_lightColor.x()).arg(m_lightColor.y()).arg(m_lightColor.z()).toUtf8());
+
+	file.write(QString("<bfCul>%1\n").arg(m_bfCulling).toUtf8());
+	file.write(QString("<liOn>%1\n").arg(m_light).toUtf8());
+	file.write(QString("<heLi>%1\n").arg(m_headlight).toUtf8());
+	file.write(QString("<auCo>%1\n").arg(m_autoColor).toUtf8());
+
+	file.write(QString("<liTy>%1\n").arg(m_lightType).toUtf8());
+	file.write(QString("<atFa>%1\n").arg(m_attenuation).toUtf8());
+	file.write(QString("<amCo>%1\n").arg(m_ambient).toUtf8());
+
+	file.close();
+}
+
+// getter ///////////////////////////////////////////////////////////////
+
+QVector3D SettingsManager::getBgColorOn() const
+{
+	return m_bgColorOn;
+}
+
+QVector3D SettingsManager::getBgColorOff() const
+{
+	return m_bgColorOff;
+}
+
+bool SettingsManager::isBfCulling() const
+{
+	return m_bfCulling;
+}
+
+bool SettingsManager::isLight() const
+{
+	return m_light;
+}
+
+int SettingsManager::getLightType() const
+{
+	return m_lightType;
+}
+
+QVector3D SettingsManager::getLightColor() const
+{
+	return m_lightColor;
+}
+
+float SettingsManager::getAttenuation() const
+{
+	return m_attenuation;
+}
+
+float SettingsManager::getAmbient() const
+{
+	return m_ambient;
+}
+
+bool SettingsManager::isHeadlight() const
+{
+	return m_headlight;
+}
+
+bool SettingsManager::isAutoColor() const
+{
+	return m_autoColor;
+}
+
+
+/////////////////////////////////////////////////////////////////////////
+// slots
+
+void SettingsManager::setBgColorOn(QVector3D value)
+{
+	m_bgColorOn = value;
+}
+
+void SettingsManager::setBgColorOff(QVector3D value)
+{
+	m_bgColorOff = value;
+}
+
+void SettingsManager::setBfCulling(bool value)
+{
+	m_bfCulling = value;
+}
+
+void SettingsManager::setLight(bool value)
+{
+	m_light = value;
+}
+
+void SettingsManager::setLightType(int value)
+{
+	m_lightType = value;
+}
+
+void SettingsManager::setLightColor(QVector3D value)
+{
+	m_lightColor = value;
+}
+
+void SettingsManager::setAttenuation(double value)
+{
+	m_attenuation = value;
+}
+
+void SettingsManager::setAmbient(double value)
+{
+	m_ambient = value;
+}
+
+void SettingsManager::setHeadlight(bool value)
+{
+	m_headlight = value;
+}
+
+void SettingsManager::setAutoColor(int value)
+{
+	if (value == 0)
+		m_autoColor = false;
+	else
+		m_autoColor = true;
+}
+
diff --git a/QtMeshViewer/Source/SettingsWindow.cpp b/QtMeshViewer/Source/SettingsWindow.cpp
index 763e88d..54ff54c 100644
--- a/QtMeshViewer/Source/SettingsWindow.cpp
+++ b/QtMeshViewer/Source/SettingsWindow.cpp
@@ -1,10 +1,11 @@
 #include "..\Header\SettingsWindow.h"
+#include "..\Header\SettingsManager.h"
 
 
 /////////////////////////////////////////////////////////////////////////
 // constructor/destructor
 
-SettingsWindow::SettingsWindow(QVector3D bgOffColor, QVector3D bgOnColor, QVector3D lightColor, bool autoColor, double ambCoef, double attFac, int lightType, QWidget * parent)
+SettingsWindow::SettingsWindow(QWidget * parent)
 	: QWidget(parent)
 	, ui(new Ui::SettingsWindow)
 {
@@ -15,24 +16,41 @@ SettingsWindow::SettingsWindow(QVector3D bgOffColor, QVector3D bgOnColor, QVecto
 	setupConnections();
 
 	// set default values
-	ui->lightOff_R_SB->setValue((int)bgOffColor[0]);
-	ui->lightOff_G_SB->setValue((int)bgOffColor[1]);
-	ui->lightOff_B_SB->setValue((int)bgOffColor[2]);
+	SettingsManager* sm = SettingsManager::getInstance(this);
 
-	ui->lightOn_R_SB->setValue((int)bgOnColor[0]);
-	ui->lightOn_G_SB->setValue((int)bgOnColor[1]);
-	ui->lightOn_B_SB->setValue((int)bgOnColor[2]);
+	ui->lightOff_R_SB->setValue((int)(sm->getBgColorOff()[0]));
+	ui->lightOff_G_SB->setValue((int)(sm->getBgColorOff()[1]));
+	ui->lightOff_B_SB->setValue((int)(sm->getBgColorOff()[2]));
 
-	ui->light_R_SB->setValue((int)lightColor[0]);
-	ui->light_G_SB->setValue((int)lightColor[1]);
-	ui->light_B_SB->setValue((int)lightColor[2]);
+	ui->lightOn_R_SB->setValue((int)(sm->getBgColorOn()[0]));
+	ui->lightOn_G_SB->setValue((int)(sm->getBgColorOn()[1]));
+	ui->lightOn_B_SB->setValue((int)(sm->getBgColorOn()[2]));
 
-	ui->ambCoef->setValue(ambCoef);
-	ui->attFac->setValue(attFac);
+	ui->light_R_SB->setValue((int)(sm->getLightColor()[0]));
+	ui->light_G_SB->setValue((int)(sm->getLightColor()[1]));
+	ui->light_B_SB->setValue((int)(sm->getLightColor()[2]));
 
-	ui->checkAutoColor->setChecked(autoColor);
-	if (lightType == 1)
+	ui->ambCoef->setValue(sm->getAmbient());
+	ui->attFac->setValue(sm->getAttenuation());
+
+	ui->checkBackfaceCulling->setChecked(sm->isBfCulling());
+	ui->checkAutoColor->setChecked(sm->isAutoColor());
+	ui->checkHeadlight->setChecked(sm->isHeadlight());
+
+	if (sm->getLightType() == 1)
 		ui->radioDirectLight->setChecked(true);
+	else
+		ui->radioPointLight->setChecked(true);
+
+	connect(this, &SettingsWindow::updateBGColorOff, sm, &SettingsManager::setBgColorOff);
+	connect(this, &SettingsWindow::updateBGColorOn, sm, &SettingsManager::setBgColorOn);
+	connect(this, &SettingsWindow::updateLightColor, sm, &SettingsManager::setLightColor);
+	connect(this, &SettingsWindow::updateAttFac, sm, &SettingsManager::setAttenuation);
+	connect(this, &SettingsWindow::updateAmbCoef, sm, &SettingsManager::setAmbient);
+	connect(this, &SettingsWindow::sendHeadlight, sm, &SettingsManager::setHeadlight);
+	connect(this, &SettingsWindow::sendBackfaceCulling, sm, &SettingsManager::setBfCulling);
+	connect(ui->checkAutoColor, &QCheckBox::stateChanged, sm, &SettingsManager::setAutoColor);
+	connect(this, &SettingsWindow::changeLightType, sm, &SettingsManager::setLightType);
 
 }
 
@@ -133,10 +151,12 @@ void SettingsWindow::radioToggled()
 	{
 		ui->attFac->setValue(0.0);
 		ui->attFac->setEnabled(false);
+		emit changeLightType(1);
 	}
 	else
 	{
 		ui->attFac->setEnabled(true);
+		emit changeLightType(2);
 	}
 }