diff --git a/src/Engine.Graphics.Vulkan/Shaders/triangle.frag b/src/Engine.Graphics.Vulkan/Shaders/triangle.frag
index 7122ce8..b0205a1 100644
--- a/src/Engine.Graphics.Vulkan/Shaders/triangle.frag
+++ b/src/Engine.Graphics.Vulkan/Shaders/triangle.frag
@@ -1,8 +1,11 @@
 #version 450
 
 layout(location = 0) in vec3 fragColor;
+layout(location = 1) in vec3 fragNormal;
 layout(location = 0) out vec4 outColor;
 
 void main() {
-    outColor = vec4(fragColor, 1.0);
+    vec3 lightDir = normalize(vec3(0.5, 0.8, 0.3));
+    float diff = max(dot(normalize(fragNormal), lightDir), 0.2);
+    outColor = vec4(fragColor * diff, 1.0);
 }
diff --git a/src/Engine.Graphics.Vulkan/Shaders/triangle.frag.spv b/src/Engine.Graphics.Vulkan/Shaders/triangle.frag.spv
index 828f1e5..4a5184b 100644
Binary files a/src/Engine.Graphics.Vulkan/Shaders/triangle.frag.spv and b/src/Engine.Graphics.Vulkan/Shaders/triangle.frag.spv differ
diff --git a/src/Engine.Graphics.Vulkan/Shaders/triangle.vert b/src/Engine.Graphics.Vulkan/Shaders/triangle.vert
index d587a87..9b81756 100644
--- a/src/Engine.Graphics.Vulkan/Shaders/triangle.vert
+++ b/src/Engine.Graphics.Vulkan/Shaders/triangle.vert
@@ -5,6 +5,7 @@ layout(location = 1) in vec3 inColor;
 layout(location = 2) in vec3 inNormal;
 
 layout(location = 0) out vec3 fragColor;
+layout(location = 1) out vec3 fragNormal;
 
 layout(row_major, set = 0, binding = 0) uniform CameraUBO {
     mat4 vp;
@@ -17,4 +18,5 @@ layout(row_major, push_constant) uniform PC {
 void main() {
     gl_Position = vp * pc.model * vec4(inPosition, 1.0);
     fragColor = inColor;
+    fragNormal = mat3(pc.model) * inNormal;
 }
diff --git a/src/Engine.Graphics.Vulkan/Shaders/triangle.vert.spv b/src/Engine.Graphics.Vulkan/Shaders/triangle.vert.spv
index edfeddb..b9f3c50 100644
Binary files a/src/Engine.Graphics.Vulkan/Shaders/triangle.vert.spv and b/src/Engine.Graphics.Vulkan/Shaders/triangle.vert.spv differ