Use MeshBasicMaterial.

examples/vr_cubes.html

@@ -84,7 +84,7 @@
 
 				crosshair = new THREE.Mesh(
 					new THREE.RingGeometry( 0.5, 1, 32 ),
-					new THREE.LineBasicMaterial( {
+					new THREE.MeshBasicMaterial( {
 						color: 0x00bb00,
 						transparent: true,
 						opacity: 0.5