I'm trying to run one of my projects in P3D, I am trying to make interesting effects based on certain events and testing in P2D works great, but once I switch over I get this error when I click and the program crashes.

I'm not entirely sure what's going on, but it seems to be a problem with threading, I've tried a number of things, println() throughout to try to determine where it's stopping, combining PGraphics images instead of using the main Applet one. I've hit a bit of a wall, any help is greatly appreciated.

Main Class(EffectToolkit2)

2. DrawableControl dc;
3. 
   
4. void setup()
5. {
6.   size(600, 600, P3D);
7.   
8.   dc = new DrawableControl(color(255), 25);
9.   
10.   dc.start();
11. }
12. 
    
13. void draw()
14. {
15. 
    
16. }
17. 
    
18. void mousePressed()
19. {
20.   dc.add(new Pulse(mouseX, mouseY, 1, 100));
21. }

DrawableControl

2. public class DrawableControl extends Thread
3. {
4.   private color background;
5.   private int ms;
6.   
7.   private ArrayList<IDrawable> list;
8.   
9.   public DrawableControl(color background, int ms)
10.   {
11.     this.background = background;
12.     this.ms = ms;
13.     
14.     list = new ArrayList<IDrawable>();
15.   }
16.   
17.   public void run()
18.   {
19.     while(true)
20.     {
21.       if(list.size() != 0)
22.       {
23.         for(int i = 0; i < list.size(); i++)
24.         {
25.           if(list.get(i).step())
26.           {
27.             list.remove(i);
28.           }
29.         }
30.         
31.         try
32.         {
33.           Thread.sleep(ms);
34.         }
35.         catch(Exception e)
36.         {
37.           e.printStackTrace();
38.         }
39.         
40.         background(background);
41.       }
42.     }
43.   }
44.   
45.   public void add(IDrawable id)
46.   {
47.     list.add(id);
48.   }
49. }

IDrawable

2. public interface IDrawable
3. {
4.   public boolean step();
5. }

Pulse

2. public class Pulse implements IDrawable
3. {
4.   private int x;
5.   private int y;
6.   private int currentRadius;
7.   private int maxSteps;
8.   
9.   public Pulse(int x, int y, int startRadius, int maxSteps)
10.   {
11.     this.x = x;
12.     this.y = y;
13.     this.currentRadius = startRadius;
14.     this.maxSteps = maxSteps;
15.   }
16.   
17.   public boolean step()
18.   {
19.     stroke(0);
20.     noFill();
21.     strokeWeight(2);
22.     
23.     currentRadius++;
24.     translate(x, y, 0);
25.     arc(0, 0, currentRadius, currentRadius, 0, 360);
26.     
27.     if(currentRadius >= maxSteps)
28.     {
29.       return true;
30.     }
31.     else
32.     {
33.       return false;
34.     }
35.   }
36. }

-Brad