Actionscript:
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var matrix:Matrix3D = new Matrix3D();
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const PARTICLE_NUM:int = 100000;
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var verts:Vector.<Number> = new Vector.<Number>();
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var pVerts:Vector.<Number> = new Vector.<Number>();
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var uvts:Vector.<Number> = new Vector.<Number>();
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for (var i:int = 0; i<PARTICLE_NUM; i++){
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verts.push(Math.random()*250 - 125);
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verts.push(Math.random()*250 - 125);
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verts.push(Math.random()*250 - 125);
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pVerts.push(0), pVerts.push(0);
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uvts.push(0), uvts.push(0), uvts.push(0);
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}
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var canvas:BitmapData = new BitmapData(400,400,false, 0x000000);
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addChild(new Bitmap(canvas));
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var dx:Number=0;
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var 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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dx += (mouseX - dx)/4;
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dy += (mouseY - dy)/4;
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matrix.identity();
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matrix.appendRotation(dy,Vector3D.X_AXIS);
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matrix.appendRotation(dx,Vector3D.Y_AXIS);
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matrix.appendTranslation(200, 200, 0);
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Utils3D.projectVectors(matrix, verts, pVerts, uvts);
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canvas.lock();
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canvas.fillRect(canvas.rect, 0x000000);
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var leng:int = pVerts.length;
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for (var i:int = 0; i<leng; i+=2){
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canvas.setPixel( pVerts[i], pVerts[i + 1], 0xFFFFFF);
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}
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canvas.unlock();
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}
The above shows an easy way to use Utils3D.projectVectors() to move some pixels around in 3D. Since the 3D math is done behind the scenes by the flash player it runs quite fast...