diff --git a/core/Material.cpp b/core/Material.cpp
index b037263..c74f74f 100644
--- a/core/Material.cpp
+++ b/core/Material.cpp
@@ -27,9 +27,9 @@ Texture Texture::FromFile(const char *filename) {
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 
   int nrChannels;
-  unsigned char* data = stbi_load(filename, &tex.width, &tex.height, &nrChannels, 0);
+  unsigned char* data = stbi_load(filename, &tex.width, &tex.height, &nrChannels, 4);
   if (data) {
-    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, tex.width, tex.height, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, tex.width, tex.height, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
     glGenerateMipmap(GL_TEXTURE_2D);
   } else {
     Util::Die("Error loading texture file: ",  filename);
diff --git a/core/Screen.cpp b/core/Screen.cpp
index ef12cab..8f6dcb6 100644
--- a/core/Screen.cpp
+++ b/core/Screen.cpp
@@ -1,10 +1,10 @@
 #include "Screen.h"
 
 const Vertex vertices[] = {
-  Vertex(-1.0f, -1.0f, 0.0f, 0.0f, 0.0f),
   Vertex(-1.0f, 1.0f, 0.0f, 0.0f, 1.0f),
+  Vertex(-1.0f, -1.0f, 0.0f, 0.0f, 0.0f),
   Vertex(1.0f, -1.0f, 0.0f, 1.0f, 0.0f),
-  
+
   Vertex(-1.0f, 1.0f, 0.0f, 0.0f, 1.0f),
   Vertex(1.0f, -1.0f, 0.0f, 1.0f, 0.0f),
   Vertex(1.0f, 1.0f, 0.0f, 1.0f, 1.0f)
diff --git a/core/couch.cpp b/core/couch.cpp
index 6c403e0..0a8d12d 100644
--- a/core/couch.cpp
+++ b/core/couch.cpp
@@ -85,6 +85,9 @@ int main() {
 
   glViewport(0, 0, width, height);
 
+  glEnable(GL_CULL_FACE);
+  glCullFace(GL_BACK);
+
   root = Node::GetRoot();
 
   Input *input = Input::GetInstance();
diff --git a/demo/grate_floor_lowres.png b/demo/grate_floor_lowres.png
new file mode 100644
index 0000000..fbd1ba0
Binary files /dev/null and b/demo/grate_floor_lowres.png differ
diff --git a/demo/main.lua b/demo/main.lua
index 44035ba..44aa2b8 100644
--- a/demo/main.lua
+++ b/demo/main.lua
@@ -36,7 +36,6 @@ function init()
    ball1:SetupMesh()
    ball1.material.tex = couch.Texture.FromFile("container.png")
    ball1.material.usesTex = true
-   print(ball1.material.tex.width, ball1.material.tex.height)
    couch.Node.GetRoot().children:Append(ball1)
 
    ball1.transform:Translate(0.0, 3.0, 0.0)
@@ -47,6 +46,13 @@ function init()
    trough.material.usesTex = true
    couch.Node.GetRoot().children:Append(trough)
    trough.transform:Translate(10.0, 0.0, 0.0)
+
+   scaffold = couch.Mesh.FromFile("scaffold.glb")
+   scaffold:SetupMesh()
+   scaffold.material.tex = couch.Texture.FromFile("grate_floor_lowres.png")
+   scaffold.material.usesTex = true
+   couch.Node.GetRoot().children:Append(scaffold)
+   scaffold.transform:Translate(-10.0, 0.0, 0.0)
 end
 
 function update(delta)
diff --git a/demo/scaffold.glb b/demo/scaffold.glb
new file mode 100644
index 0000000..4d018c5
Binary files /dev/null and b/demo/scaffold.glb differ
diff --git a/shaders/flat.frag b/shaders/flat.frag
index f77cb12..29b52cf 100644
--- a/shaders/flat.frag
+++ b/shaders/flat.frag
@@ -2,8 +2,6 @@
 
 in vec3 UV;
 
-out vec4 FragColor;
-
 struct Material {
   vec3 color;
   bool usesColor;
@@ -14,11 +12,14 @@ struct Material {
 uniform Material material;
 
 void main() {
-  FragColor = vec4(0.0);
+  gl_FragColor = vec4(0.0);
   if (material.usesColor) {
-    FragColor += vec4(material.color, 1.0);
+    gl_FragColor += vec4(material.color, 1.0);
   }
   if (material.usesTex) {
-    FragColor += texture(material.tex, UV.xy / UV.z);
+    gl_FragColor += texture(material.tex, UV.xy / UV.z);
+  }
+  if (gl_FragColor.w < 0.99) {
+    discard;
   }
 }