Three.js-101-:-Hello-World!.md

@@ -137,8 +137,25 @@ cube.rotation.y += 0.01;
 ## BufferGeometry
 A representation of mesh, line, or point geometry. Includes vertex positions, face indices, normals, colors, UVs, and custom attributes within buffers, reducing the cost of passing all this data to the GPU.
 
-
-
-
+```
+const geometry = new THREE.BufferGeometry();
+
+// create a simple square shape. We duplicate the top left and bottom right
+// vertices because each vertex needs to appear once per triangle.
+const vertices = new Float32Array( [
+	-1.0, -1.0,  1.0, // v0
+	 1.0, -1.0,  1.0, // v1
+	 1.0,  1.0,  1.0, // v2
+
+	 1.0,  1.0,  1.0, // v3
+	-1.0,  1.0,  1.0, // v4
+	-1.0, -1.0,  1.0  // v5
+] );
+
+// itemSize = 3 because there are 3 values (components) per vertex
+geometry.setAttribute( 'position', new THREE.BufferAttribute( vertices, 3 ) );
+const material = new THREE.MeshBasicMaterial( { color: 0xff0000 } );
+const mesh = new THREE.Mesh( geometry, material );
+```