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繼續(xù)上次的學(xué)習(xí)，接下來要試試攝像機的移動了。
這里需要涉及幾個概念，攝像機的坐標(biāo)（x, y, z）和視覺角度（LookAt）
攝像機的位置可以使用（x, y, z）來定位；
視覺角度可以定義如何通過窗口來看場景。
lookAt(p_nX:Number, p_nY:Number, p_nZ:Number)
如：lookAt(0,0,0);//可以理解為通過攝像機的位置看場景。

攝像機的移動方式比較有意思，如果直接修改x、y、z坐標(biāo)，視覺效果會與現(xiàn)實看到的情況相同；
而tilt、pan則是與場景平行移動；
roll是以z軸移動，通過攝像機視野看上去是攝像機的旋轉(zhuǎn)效果。

額外說一下 Line3D 是在場景中繪制了線段，這里用做參考線，代碼不難理解我就不過多解釋了。

代碼如下：

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 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() {
            //創(chuàng)建一個攝像機
            camera = new Camera3D(300, 300);
            camera.x = 100;
            camera.y = 100;
            camera.z = -300;
            camera.lookAt(0,0,0);
            //創(chuàng)建一個 Group
            var root:Group = createScene();
            //創(chuàng)建場景
            scene = new Scene3D( "scene", this, camera, root );
            //創(chuàng)建實時偵聽
            addEventListener( Event.ENTER_FRAME, enterFrameHandler );
            stage.addEventListener(KeyboardEvent.KEY_DOWN, keyPressed);
        }
        var box = new Box("box", 100, 100, 100);
        var Plane:Plane3D;
        public function createScene() {
            var g:Group = new Group();
            
            //在場景畫一個坐標(biāo)定位點
            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();
        }
        public function keyPressed(_evt:KeyboardEvent):void {
            switch(_evt.keyCode) {
                case Keyboard.UP:
                    camera.tilt += 2;
                    //camera.y -= 2;
                    break;
                case Keyboard.DOWN:    
                    camera.tilt -= 2;
                    //camera.y += 2;
                    break;
                case Keyboard.RIGHT:
                    camera.pan -= 2;
                    //camera.x += 2;
                    break;
                case Keyboard.LEFT:
                    camera.pan += 2;
                    //camera.x -= 2;
                    break;
                case Keyboard.CONTROL:
                    camera.roll += 2;
                    break;    
                case Keyboard.PAGE_DOWN:
                    camera.z -= 5;
                    break;
                case Keyboard.PAGE_UP:
                    camera.z += 5;
                    break;    
            }
        }
    }
    
}

效果：

出處：藍(lán)色理想
責(zé)任編輯：bluehearts

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