Actionscript:
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[SWF(backgroundColor=0x444444, width=500, height=500)]
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var hsw:Number = stage.stageWidth / 2;
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var hsh:Number = stage.stageHeight / 2;
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var pointNum:int = 200;
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var points3D:Vector.<Number> = new Vector.<Number>();
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var points2D:Vector.<Number> = new Vector.<Number>();
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var uvts:Vector.<Number> = new Vector.<Number>();
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var sorted:Array = [];
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var pnt:Point = new Point();
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var m:Matrix3D = new Matrix3D();
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var v:Vector3D = new Vector3D();
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for (var i:int = 0; i<pointNum; i++){
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v.x = Math.random()*400-200;
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m.identity();
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m.appendRotation(Math.random()*360, Vector3D.X_AXIS);
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m.appendRotation(Math.random()*360, Vector3D.Y_AXIS);
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m.appendRotation(Math.random()*360, Vector3D.Z_AXIS);
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v = m.transformVector(v);
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points3D.push(v.x, v.y, v.z);
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points2D.push(0,0);
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uvts.push(0,0,0);
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sorted.push(new Vector3D());
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}
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points3D.fixed = true;
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points2D.fixed = true;
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uvts.fixed = true;
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var p:PerspectiveProjection = new PerspectiveProjection();
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var proj:Matrix3D = p.toMatrix3D();
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var dx:Number = 0, dy:Number = 0;
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addEventListener(Event.ENTER_FRAME, onLoop);
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function onLoop(evt:Event):void {
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var i:int, j:int;
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dx += (mouseX - dx) / 4;
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dy += (mouseY - dy) / 4;
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m.identity();
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m.appendRotation(dx, Vector3D.Y_AXIS);
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m.appendRotation(dy, Vector3D.X_AXIS);
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m.appendTranslation(0, 0, 1000);
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m.append(proj);
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Utils3D.projectVectors(m, points3D, points2D, uvts);
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for (i = 0, j = 0; i<points2D.length; i+=2, j++){
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sorted[j].x = points2D[i] + hsw;
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sorted[j].y = points2D[i + 1] + hsh;
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sorted[j].z = uvts[j * 3 + 2];
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}
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sorted.sortOn("z", Array.NUMERIC);
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graphics.clear();
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for(i = 0; i<sorted.length; i++){
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var zpos:Number = sorted[i].z * 12000;
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var c:int = zpos * 14;
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graphics.beginFill(c <<16 | c <<8 | c);
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graphics.drawCircle(sorted[i].x, sorted[i].y,zpos);
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graphics.endFill();
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}
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}
Here is an easy way to do z-sorting on a cluster of circles.
Have a look at the swf over at wonderfl...
