Forked from:: y_tti's Papervision3D 3D座標→2D座標

forked from: Papervision3D 3D座標→2D座標

3D座標→2D座標の変換。
参考：http://www.nabble.com/3D-%3E%3E-2D-coordinates-td14730886.html

Masaoki.Ikom..

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license : MIT License
modified : 2011-11-29 19:24:01

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// forked from y_tti's Papervision3D 3D座標→2D座標
package
{
    //3D座標→2D座標の変換。
    //参考：http://www.nabble.com/3D-%3E%3E-2D-coordinates-td14730886.html
    
    import flash.display.StageQuality;
    import flash.events.Event;
    import flash.geom.Point;
    
    import org.papervision3d.cameras.CameraType;
    import org.papervision3d.core.math.Matrix3D;
    import org.papervision3d.core.proto.CameraObject3D;
    import org.papervision3d.lights.PointLight3D;
    import org.papervision3d.materials.shadematerials.FlatShadeMaterial;
    import org.papervision3d.materials.utils.MaterialsList;
    import org.papervision3d.objects.DisplayObject3D;
    import org.papervision3d.objects.primitives.Cube;
    import org.papervision3d.view.BasicView;
    
    [SWF(width = "465", height = "465", frameRate = "30", backgroundColor = "0x000000")]
    public class TestObj2DPoint extends BasicView
    {
        private var _cube:Cube;
        private var _ball:Ball;
        public function TestObj2DPoint()
        {
            stage.quality = StageQuality.BEST;
            super(465,465,false,false,CameraType.DEBUG);
            
            //FlatShadeを使用したcube作成 (3次元)
            var light:PointLight3D = new PointLight3D();
            var flatmate:FlatShadeMaterial = new FlatShadeMaterial(light,0xFF00FF,0xAA00AA);
            flatmate.doubleSided = true;
            var materials:MaterialsList = new MaterialsList({all:flatmate});
            _cube =new Cube(materials,500,500,500,4,4,4);
            scene.addChild(_cube);
            
            //ボール作成(2次元)
            _ball = new Ball();
            addChild(_ball);
            
            startRendering();
            addEventListener(Event.ENTER_FRAME , _loop );
        }
        
        private function _loop(e:Event):void {
            _cube.yaw(1);
            _cube.pitch(0.5);
            
            //3D座標のCubuの位置を2D座標に変換 →ボールのxyに代入。
            var p:Point = getObj2DCords(_cube,camera,stage.stageWidth/2 , stage.stageHeight/2 );
            _ball.x = p.x;
            _ball.y = p.y;
        }
        
        //参考：http://www.nabble.com/3D-%3E%3E-2D-coordinates-td14730886.html
        private function getObj2DCords ( o:DisplayObject3D, camera:CameraObject3D,  offsetX:Number = 0, offsetY:Number = 0 ):Point
        {
            var view:Matrix3D = o.view;
            var persp:Number = (camera.focus * camera.zoom) / (camera.focus + view.n34);
            return new Point ( (view.n14 * persp) + offsetX, (view.n24 * persp) + offsetY );
        }
    }
}
    import flash.display.Sprite;

class Ball extends Sprite {
    public function Ball():void {
        this.graphics.beginFill(0x0000FF , 1 );
        this.graphics.drawCircle(0,0,20);
        this.graphics.endFill();
    }
}

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