I'm working on a project that allows me to draw 3D shapes in the air with an infrared pen.

Currently my infrared camera is communicating to an arduino through I2C. I use Processing to get the data and display it.

The camera gives me X,Y coordinates and I have an ultrasonic range finger giving me depth info.

I want to be able to get depth information by using 2 cameras and parallax differences though. I can't figure out how to get the 2 stations and the computer to communicate together efficiently though. Right now I have the 2 stations plugged in 2 different USB ports on my computer. I'm currently using the code below but there is no response from the system. Perhaps I need to change the code on the arduino? Any advice or pointers to resources?

2. import processing.serial.*;
3. 
   
4. Serial firstArduinoPort;    //creates object "firstArduinoPort" of serial class
5. Serial secondArduinoPort;   //creates object "secondArduinoPort" of serial class
6. 
   
7. void setup()
8. {
9.   size(200,200);
10.   background(255);
11.   
12.   println(Serial.list()); //prints a list of open ports use this to doublecheck which port is which
13.   //also make sure to assign correct boud rate
14. 
    
15.   //initialize serials 
16.   firstArduinoPort = new Serial(this, Serial.list()[0], 115200); //port 4
17.   firstArduinoPort.bufferUntil(' ');
18.   
19.   secondArduinoPort = new Serial(this, Serial.list()[8], 115200); //port 6
20.   secondArduinoPort.bufferUntil(' ');
21. }
22. 
    
23. void draw()
24. {
25.  
26. }
27. 
    
28. void serialEvent(Serial myPort) {
29.   //println("serial event detected");
30.   println("hey");
31.   if (myPort == firstArduinoPort) {
32.     
33.       String myString = firstArduinoPort.readStringUntil(' '); //reads string until space -- follow example
34.       println("first cam");
35.       println(myString);
36.   }
37.   else if (myPort == secondArduinoPort) {
38.     
39.       String myString = secondArduinoPort.readStringUntil(' ');
40.       println("second cam");
41.       println(myString);
42.     }
43.     
44.   }