diff --git a/QtMeshViewer/Resources/fshader.glsl b/QtMeshViewer/Resources/fshader.glsl
index f1145dd..1d9163e 100644
--- a/QtMeshViewer/Resources/fshader.glsl
+++ b/QtMeshViewer/Resources/fshader.glsl
@@ -4,21 +4,37 @@ precision mediump int;
 precision mediump float;
 #endif
 
+uniform mat3 n_matrix;
 uniform sampler2D texture;
 
+uniform struct Light {
+    vec3 position;
+    vec3 intensities;
+} light;
+
 uniform bool b_transparent;
 
 varying vec2 v_texcoord;
+varying vec3 v_position;
+varying vec3 v_normal;
 
 void main()
 {
+    
+    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);
+
 	// Set fragment color from texture
-	vec4 finalColor = vec4(texture2D(texture, v_texcoord));
+	vec4 surfaceColor = vec4(texture2D(texture, v_texcoord));
 
 	if(!b_transparent)
 	{
-		finalColor.a = 1.0f;
+		surfaceColor.a = 1.0f;
 	}
 
-	gl_FragColor = finalColor;
+	gl_FragColor = vec4(brightness * light.intensities * surfaceColor.rgb, surfaceColor.a);
 }
diff --git a/QtMeshViewer/Resources/vshader.glsl b/QtMeshViewer/Resources/vshader.glsl
index e10730e..5282e7a 100644
--- a/QtMeshViewer/Resources/vshader.glsl
+++ b/QtMeshViewer/Resources/vshader.glsl
@@ -13,13 +13,17 @@ attribute vec2 a_texcoord;
 attribute vec3 a_normal;
 
 varying vec2 v_texcoord;
+varying vec3 v_position;
+varying vec3 v_normal;
 
 void main()
 {
 	// Calculate vertex position in screen space
 	gl_Position = vp_matrix * norm_matrix * m_matrix * a_position;
 
-	// Pass texture coordinate to fragment shader
+	// Pass data to fragment shader
 	// Value will be automatically interpolated to fragments inside polygon faces
 	v_texcoord = a_texcoord;
+	v_position = vec3(norm_matrix * m_matrix * a_position);
+	v_normal = a_normal;
 }