diff --git a/data/shaders/default_frag.glsl b/data/shaders/default_frag.glsl
index 5df54b3..5d5a1e5 100644
--- a/data/shaders/default_frag.glsl
+++ b/data/shaders/default_frag.glsl
@@ -2,8 +2,11 @@
 
 out vec4 fragColor;
 smooth in vec4 ioFragColor;
+in vec3 ioNormal;
+in vec2 ioUV;
 
 void main()
 {
-    fragColor = ioFragColor;
+    float diff = max(dot(ioNormal, vec3(1., 1., 1.)), 0.3);
+    fragColor = ioFragColor * diff;
 }
diff --git a/data/shaders/default_vert.glsl b/data/shaders/default_vert.glsl
index 69b3b3e..874d7f9 100644
--- a/data/shaders/default_vert.glsl
+++ b/data/shaders/default_vert.glsl
@@ -10,9 +10,13 @@ uniform mat4 uViewMatrix;
 uniform mat4 uProjectionMatrix;
 
 smooth out vec4 ioFragColor;
+out vec3 ioNormal;
+out vec2 ioUV;
 
 void main()
 {
     ioFragColor = inColor;
+    ioNormal = inNormal;
+    ioUV = inUV;
     gl_Position = (uProjectionMatrix * uViewMatrix * uModelMatrix * inCoord);
 }