Hi Ive made a program that allows you to move a cube around the screen + and - control the speed of the cude and the left and right keys control its direction.

i wish to extend this program to work in 3D (IE you will be able to turn the cube along the Z axis and have it move either towards or away from you)

I have absolutley no idea on how to do this.
any able to give me some code examples?

heres the code for the 2D movement

import processing.opengl.*;

float radius;
float angle;
float speed;
float rotation;
float y;
float x;
float xpos;
float ypos;


void setup ()
{
 size(1280,1024,OPENGL);
 radius = 40;
 angle = 180;
 speed = 0.5;
 rotation = radians(0);
 y =0;
 x =0;
 xpos = 0;
 ypos =0;
 speed  = 0;
}  
void draw ()
{
 lights();
 background(255);
 translate(width/2,height/2,0);
 scale(.5);
 
 if(keyPressed)
 {
   if(keyCode == LEFT)
   {
     angle = angle + .2;
     movement();
     
   }
   if(keyCode == RIGHT)
   {
     angle = angle - .2;
     movement();
   
   }
   if(key == '=')
   {
       speed = speed + 0.01;
       movement();
   }
   if(key == '-')
   {
       speed = speed - 0.01;
       movement();
   }
   if(key == 'z')
  {    
       
       firePhaser();
       movement();
   }
  }
  else
  {
     movement();
  }
 
  translate(x,y,0);
  fill(255,0,255);
  rotate(-angle/57.5);  
  box(60);
   
 
}
void movement()
{
   x = x + xpos;
   y = y + ypos;
   xpos = sin(radians(angle))*speed;
   ypos = cos(radians(angle))*speed;
}