You can start by looking at the Processing examples. There are several sketches showing "balls" (actually simple circles) bouncing on the sketch bounds. (In the Motion section).
Another task is to locate a library able to load the model in one of the formats you can generate. I know there are several, but I never tried them.
Hint: take a look at the Related Posts links that Zoho kindly generated on the right of this thread...

Thanks for the tips!

look at this....

1. float CameraX;
2. float CameraY;
3. PVector ball = new PVector(330, 330, 0);
4. PVector ballAdd = new PVector(.3, .4, -.3);
5. PVector borderFirst   = new PVector(100, 100, -400);
6. PVector borderSecond  = new PVector(600, 400, 0);
7. void setup()
8. {
9.   size( 800, 800, P3D );
10.   CameraX = width / 2.0;
11.   CameraY = 50;
12.   noCursor();
13. } // setup
14. void draw()
15. {
16.   background(0);
17.   stroke(111, 110, 110);
18.   fill(111, 110, 110);
19.   // ================================================== 
20.   // camera
21.   camera(
22.   CameraX, CameraY, 700,
23.   width/2.0, height/2.0, 0,
24.   0, 1, 0);
25.   // ==================================================
26.   //
27.   pushMatrix();
28.   strokeWeight(5);
29.   noStroke();
30.   lights();
31.   translate(ball.x, ball.y, ball.z);
32.   sphere(28);
33.   popMatrix();
34.   //
35.   ball.x+=ballAdd.x;
36.   ball.y+=ballAdd.y;
37.   ball.z+=ballAdd.z;
38.   //
39.   if (ball.x>borderSecond.x)
40.     ballAdd.x=-abs(ballAdd.x);
41.   if (ball.x<borderFirst.x)
42.     ballAdd.x=abs(ballAdd.x);   
43.   if (ball.y>borderSecond.y)
44.     ballAdd.y=-abs(ballAdd.y);
45.   if (ball.y<borderFirst.y)
46.     ballAdd.y=abs(ballAdd.y);
47.   if (ball.z<borderFirst.z)
48.     ballAdd.z=abs(ballAdd.z);
49.   if (ball.z>borderSecond.z)
50.     ballAdd.z=-abs(ballAdd.z);   
51.   //
52.   stroke(255);
53.   strokeWeight(1);
54.   line (borderSecond.x, borderSecond.y, borderSecond.z, borderSecond.x, borderFirst.y, borderSecond.z);
55.   line (borderFirst.x, borderSecond.y, borderSecond.z, borderSecond.x, borderSecond.y, borderSecond.z);
56.   line (400, 400, -400, 400, 100, -400);
57.   line (100, 400, -400, 400, 400, -400);   
58.   //
59. } // draw
60. void keyPressed() {
61.   if (key == CODED) {
62.     if (keyCode == UP) {
63.       CameraY-=10;
64.     }
65.     else if (keyCode == DOWN) {
66.       CameraY+=10;
67.     }
68.     else if (keyCode == RIGHT) {
69.       CameraX+=10;
70.     }
71.     else if (keyCode == LEFT) {
72.       CameraX-=10;
73.     }
74.     else {
75.       // nothing
76.     }
77.   }
78.   else { 
79.     // not key == CODED
80.     //
81.   }
82. }
83. //

this is great, thanks Chrisir.