Add BSPTree.Node traverse method

index.js

@@ -923,14 +923,13 @@ define(['three'], function(THREE, BSPTree){
 		
 		BSPTree.prototype.toArray = function(){
 			var output = [];
-			function traverse(node){
-				if(node){
-					traverse(node.back);
-					output.push(node.element);
-					traverse(node.front);
-				}
-			}
-			traverse(this.root);
+
+            if(this.root){
+                this.root.traverse(function(elem){
+                    output.push(elem);
+                });
+            }
+
 			return output;
 		}
 		
@@ -1030,6 +1029,22 @@ define(['three'], function(THREE, BSPTree){
 				return -1;
 			}
 		}
+
+        BSPTree.Node.prototype.traverse = function(callback){
+            if(!callback){
+                return;
+            }
+
+            if(this.back){
+                this.back.traverse(callback);            
+            }
+
+            callback(this.element);      
+
+            if(this.front){
+                this.front.traverse(callback);
+            }
+        }
 		
 		
 		BSPTree.LineNode = function(element){