Distance Spring

Actionscript:
1. [SWF(backgroundColor=0x222222, width=500, height=500)]
2. var hsw:Number = stage.stageWidth / 2;
3. var hsh:Number = stage.stageHeight / 2;
4. var pointNum:int = 800
5. var points3D:Vector.<Number> = new Vector.<Number>();
6. var points3Dout:Vector.<Number> = new Vector.<Number>();
7. var points2D:Vector.<Number> = new Vector.<Number>();
8. var uvts:Vector.<Number> = new Vector.<Number>();
9. var sorted:Array = [];
10. var pnt:Point = new Point();
11. var m:Matrix3D = new Matrix3D();
12. var v:Vector3D = new Vector3D();
13. for (var i:int = 0; i<pointNum; i++){
14.     v.y = i * 0.7 - 300
15.     var t =Math.random()*6.28;
16.     v.x = 200 * Math.cos(i * 2 * Math.PI / 180);
17.     v.z = 200 * Math.sin(i * 2 * Math.PI / 180);
18.     v = m.transformVector(v);
19.     points3D.push(v.x, v.y, v.z);
20.     points2D.push(0,0);
21.     uvts.push(0,0,0);
22.     sorted.push(new Vector3D());
23. }
24. points3D.fixed = true;
25. points2D.fixed = true;
26. uvts.fixed = true;
27. var p:PerspectiveProjection = new PerspectiveProjection();
28. var proj:Matrix3D = p.toMatrix3D();
29. var dx:Number = 0, dy:Number = 0;
31. function onLoop(evt:Event):void {
32.     var i:int, j:int;
33.     dx += (mouseX - dx) / 4;
34.     dy += (mouseY - dy) / 4;
35.     m.identity();
36.     m.appendRotation(getTimer() / 4, Vector3D.Y_AXIS);
37.     m.transformVectors(points3D, points3Dout);
38.
39.     m.identity();
40.     m.appendRotation(dx, Vector3D.Z_AXIS);
41.     m.appendRotation(dy, Vector3D.X_AXIS);
42.     m.appendTranslation(0, 0, 1000);
43.     m.append(proj);
44.     Utils3D.projectVectors(m, points3Dout, points2D, uvts);
45.     for (i = 0, j = 0; i<points2D.length; i+=2, j++){
46.         sorted[j].x = points2D[i] + hsw;
47.         sorted[j].y = points2D[i + 1] + hsh;
48.         sorted[j].z = uvts[j * 3 + 2];
49.     }
50.     sorted.sortOn("z", Array.NUMERIC);
51.     graphics.clear();
52.     for(i = 0; i<sorted.length; i++){
53.         var zpos:Number = sorted[i].z * 10000;
54.         var c:int = zpos * 14;
55.         graphics.beginFill(c <<16 | c <<8 | c);
56.         graphics.drawCircle(sorted[i].x, sorted[i].y, zpos);
57.         graphics.endFill();
58.     }
59. }

A variation on some recent posts... this snippet draws a rotating spring made up of 800 particles...

Have a look at the swf...

1. Posted September 8, 2009 at 9:12 am | Permalink

Very nice!

2. Posted September 8, 2009 at 11:17 am | Permalink

Thanks

3. gen4
Posted March 8, 2010 at 1:43 pm | Permalink

Great, thanks!

Can anybody help me - how i can rotate matrix relate word axis, but not a local, object-axis?