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還有場景自適應(yīng)的問題，需要說明一下。

攝像機(jī)的鏡頭可視角度使用 fov（vertical field of view angle）來定義。

換算公式：

var fl:Numer = (viewport.height / 2) / Math.tan (camera.fov / 2 * (Math.PI / 180));

代碼：

package
{
    import flash.display.Sprite;
    import flash.events.*;
    import flash.ui.*;
    import flash.display.Bitmap;
    import flash.display.BitmapData;
    import flash.display.Loader;
    import flash.net.URLRequest;
    import flash.display.Stage;
    import flash.display.StageAlign;
    import flash.display.StageScaleMode;
    import sandy.core.Scene3D;
    import sandy.core.scenegraph.*;
    import sandy.primitive.*;
    import sandy.materials.*;
    import sandy.materials.attributes.*;
    import sandy.core.data.*;
   
    /**
     * ...
     * @author ever5u
     */
    public class fuxi extends Sprite
    {
        private var scene:Scene3D;
        private var camera:Camera3D;
        public function fuxi() {
            stage.scaleMode = StageScaleMode.NO_SCALE;
            stage.align = StageAlign.TOP_LEFT;
            //創(chuàng)建一個(gè)攝像機(jī)
            camera = new Camera3D(300, 300);
            camera.x = 100;
            camera.y = 100;
            camera.z = -300;
            camera.lookAt(0,0,0);
            //創(chuàng)建一個(gè) Group
            var root:Group = createScene();
            //創(chuàng)建場景
            scene = new Scene3D( "scene", this, camera, root );
            //創(chuàng)建實(shí)時(shí)偵聽
            addEventListener( Event.ENTER_FRAME, enterFrameHandler );
            stage.addEventListener (Event.RESIZE, onResize);
        }
        var box = new Box("box", 100, 100, 100);
        var Plane:Plane3D;
        public function createScene() {
            var g:Group = new Group();
           
            //在場景畫一個(gè)坐標(biāo)定位點(diǎn)
            Plane = new Plane3D("Texture", 300, 300);
            var myXLine:Line3D = new Line3D( "x-coord", new Point3D( -20, 0, 0), new Point3D( 20, 0, 0 ));
            var myYLine:Line3D = new Line3D( "y-coord", new Point3D(0, -20, 0), new Point3D( 0, 20, 0 ));
            var myZLine:Line3D = new Line3D( "z-coord", new Point3D(0, 0, -20), new Point3D( 0, 0, 20 ));
           
            g.addChild(myXLine);
            g.addChild(myYLine);
            g.addChild(myZLine);
            g.addChild( box );
            return g;
        }
        public function enterFrameHandler(_evt:Event) {
            box.rotateX = mouseX;
            box.rotateY = mouseY;
            scene.render();
        }
        function onResize (e:Event):void{
            // 獲取場景寬高
            var w:Number = stage.stageWidth;
            var h:Number = stage.stageHeight;
            // 設(shè)置視野寬高
            scene.camera.viewport.width = w;
            scene.camera.viewport.height = h;
            // 獲取物體box與攝像機(jī)間的距離
            var d:Number = box.getPosition ("camera").getNorm ();
            // 保持?jǐn)z像機(jī)觀看比例
            scene.camera.fov = 2 * Math.atan2 (h / 2, d) * (180 / Math.PI);
            // 執(zhí)行渲染
            scene.render();
        }
    }
   
}

效果：

出處：藍(lán)色理想
責(zé)任編輯：bluehearts

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