diff --git a/QtMeshViewer/Header/OglViewerWidget.h b/QtMeshViewer/Header/OglViewerWidget.h
index 0fd1cea..b356aee 100644
--- a/QtMeshViewer/Header/OglViewerWidget.h
+++ b/QtMeshViewer/Header/OglViewerWidget.h
@@ -37,6 +37,11 @@ private:
 		bool z = true;
 	} m_rotDirections;
 
+	struct {
+		QVector3D position = { 1,1,1 };
+		QVector3D intensities = { 1,1,1 };
+	} m_light;
+
 	QOpenGLShaderProgram m_program;
 	GeometryEngine *m_dataEngine;
 
diff --git a/QtMeshViewer/Resources/fshader.glsl b/QtMeshViewer/Resources/fshader.glsl
index 1d9163e..68efc1d 100644
--- a/QtMeshViewer/Resources/fshader.glsl
+++ b/QtMeshViewer/Resources/fshader.glsl
@@ -6,10 +6,11 @@ precision mediump float;
 
 uniform mat3 n_matrix;
 uniform sampler2D texture;
+uniform mat4 m_matrix;
 
 uniform struct Light {
-    vec3 position;
-    vec3 intensities;
+	vec3 position;
+	vec3 intensities;
 } light;
 
 uniform bool b_transparent;
@@ -20,13 +21,13 @@ varying vec3 v_normal;
 
 void main()
 {
-    
-    vec3 normal = normalize(n_matrix * v_normal);
+	mat3 normalMatrix = transpose(inverse(mat3(m_matrix)));
+	vec3 normal = normalize(n_matrix * v_normal);
 
-    vec3 surfaceToLight = light.position - v_position;
-    
-    float brightness = dot(normal, surfaceToLight) / (length(surfaceToLight) * length(normal));
-    brightness = clamp(brightness, 0, 1);
+	vec3 surfaceToLight = light.position - v_position;
+
+	float brightness = dot(normal, surfaceToLight) / (length(surfaceToLight) * length(normal));
+	brightness = clamp(brightness, 0, 1);
 
 	// Set fragment color from texture
 	vec4 surfaceColor = vec4(texture2D(texture, v_texcoord));
diff --git a/QtMeshViewer/Source/OglViewerWidget.cpp b/QtMeshViewer/Source/OglViewerWidget.cpp
index 60221ae..da922fd 100644
--- a/QtMeshViewer/Source/OglViewerWidget.cpp
+++ b/QtMeshViewer/Source/OglViewerWidget.cpp
@@ -225,6 +225,10 @@ void OglViewerWidget::paintGL()
 	// Set view-projection matrix
 	m_program.setUniformValue("vp_matrix", m_projection * view);
 
+	// Set Light
+	m_program.setUniformValue("light.position", m_light.position);
+	m_program.setUniformValue("light.intensities", m_light.intensities);
+
 	// Draw cube geometry
 	m_dataEngine->drawGeometry(&m_program, m_wireframe);
 }