diff --git a/dywmtohrda.js b/dywmtohrda.js
index 7164061..496614d 100644
--- a/dywmtohrda.js
+++ b/dywmtohrda.js
@@ -149,7 +149,7 @@ if (this.spawningBullets === true) {
 		var position = this.camera.position.instance.clone();
 		var lookAt = this.camera.lookAt.instance.clone();
 		
-		var direction = position.subtract(lookAt);
+		var direction = position.sub(lookAt);
 		
 		
 		
@@ -160,8 +160,8 @@ if (this.spawningBullets === true) {
 			
 		var geometry = new THREE.Geometry();
 		geometry.vertices.push(
-			direction.add(200),
-			direction.subtract(200)
+			direction.addScalar(200),
+			direction.subScalar(200)
 		);
 
 		var line = new THREE.Line( geometry, material );