diff --git a/src/main.rs b/src/main.rs
index 06f4c2c..833ec1d 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -164,6 +164,18 @@ fn main () {
 			format: iqm::FLOAT,
 			size: 3,
 		},
+		iqm::VertexArrayUnplaced {
+			r#type: iqm::BLENDINDEXES,
+			flags: 0,
+			format: iqm::UBYTE,
+			size: 4,
+		},
+		iqm::VertexArrayUnplaced {
+			r#type: iqm::BLENDWEIGHTS,
+			flags: 0,
+			format: iqm::UBYTE,
+			size: 4,
+		},
 	];
 	
 	let vertexes = vertexes;
@@ -277,7 +289,7 @@ fn main () {
 		f.write_all (&(mesh.num_triangles.to_le_bytes ())).unwrap ();
 	}
 	
-	// Vertex arrays
+	// Vertex array meta-data
 	
 	for va in &vertexarrays {
 		f.write_all (&(va.r#type.to_le_bytes ())).unwrap ();
@@ -287,7 +299,7 @@ fn main () {
 		f.write_all (&(va.offset.to_le_bytes ())).unwrap ();
 	}
 	
-	// Vertex position
+	// Vertex data
 	
 	for v in &vertexes {
 		for x in v.position {
@@ -301,6 +313,14 @@ fn main () {
 		}
 	}
 	
+	for v in &vertexes {
+		f.write_all (&[0, 0, 0, 0]).unwrap ();
+	}
+	
+	for v in &vertexes {
+		f.write_all (&[255, 0, 0, 0]).unwrap ();
+	}
+	
 	// Triangles
 	
 	for t in triangles {
@@ -334,6 +354,7 @@ mod iqm {
 	pub const BLENDINDEXES: u32 = 4;
 	pub const BLENDWEIGHTS: u32 = 5;
 	
+	pub const UBYTE: u32 = 1;
 	pub const FLOAT: u32 = 7;
 	
 	pub struct VertexArrayUnplaced {
@@ -346,6 +367,7 @@ mod iqm {
 	impl VertexArrayUnplaced {
 		pub fn stride (&self) -> u32 {
 			self.size * match self.format {
+				UBYTE => 1,
 				FLOAT => 4,
 				_ => panic! ("Can't handle this vertexarray format yet"),
 			}