diff --git a/examples/glview/shader.frag b/examples/glview/shader.frag
index 9fa989a..05d28ce 100644
--- a/examples/glview/shader.frag
+++ b/examples/glview/shader.frag
@@ -11,6 +11,6 @@ void main(void)
     if (uIsCurve > 0) {
         gl_FragColor = texture2D(diffuseTex, texcoord);
     } else {
-        gl_FragColor = vec4(0.5, 0.6, 0.7, 1.0);
+        gl_FragColor = vec4(0.5 * normalize(normal) + 0.5, 1.0);
     }
 }