diff --git a/demo/ball.glb b/demo/ball.glb
new file mode 100644
index 0000000..2fc41b4
Binary files /dev/null and b/demo/ball.glb differ
diff --git a/demo/main.lua b/demo/main.lua
index 9154ec3..79df4d9 100644
--- a/demo/main.lua
+++ b/demo/main.lua
@@ -31,7 +31,7 @@ function init()
    light.color = couch.Vector3(1.0, 1.0, 1.0)
    light.ambient = 0.2
    light.diffuse = 1.0
-   light.specular = 0.0001
+   light.specular = 0.01
    couch.Node.GetRoot().children:Append(light)
    
    ball = couch.Mesh.FromFile("cube.glb")
@@ -41,7 +41,7 @@ function init()
    ball:SetMaterial(0, material)
    couch.Node.GetRoot().children:Append(ball)
    
-   ball1 = couch.Mesh.FromFile("cube.glb")
+   ball1 = couch.Mesh.FromFile("ball.glb")
    material = couch.Material()
    material.tex = couch.Texture.FromFile("container.png")
    material.usesTex = true
diff --git a/shaders/flat.frag b/shaders/flat.frag
index 10c6970..d9fc34b 100644
--- a/shaders/flat.frag
+++ b/shaders/flat.frag
@@ -2,7 +2,7 @@
 
 in vec3 UV;
 in vec3 NORMAL;
-in vec3 LIGHT;
+flat in vec3 LIGHT;
 
 out vec4 FragColor;
 
diff --git a/shaders/flat.vert b/shaders/flat.vert
index 486f2f2..61792e1 100644
--- a/shaders/flat.vert
+++ b/shaders/flat.vert
@@ -10,7 +10,7 @@ uniform mat4 PROJECTION;
 
 out vec3 UV;
 out vec3 NORMAL;
-out vec3 LIGHT;
+flat out vec3 LIGHT;
 
 struct DirectionalLight {
   vec3 direction;