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天啊，又有了一個新的概念了，光源

光源也是可以移動的，可以實現(xiàn)物體不同位置的反光效果。

先預習一下，setDirection      
setDirection(x:Number, y:Number, z:Number):void
參數(shù)：
x:Number — 光源的X坐標
y:Number — 光源的Y坐標
Z:Number — 光源的Z坐標

為了使光的效果更明顯，這里用球型（Sphere）。
使用鍵盤的上、下、左、右、Page UP、Page Down鍵來控制光源坐標。

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;
        private var lightX = 0;
        private var lightY = 0;
        private var lightZ = 10;
        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 );
            scene.light.setDirection(lightX, lightY, lightZ);
            //創(chuàng)建實時偵聽
            addEventListener( Event.ENTER_FRAME, enterFrameHandler );
            stage.addEventListener(KeyboardEvent.KEY_DOWN, keyPressed);
        }
        //這次用個球型
        var mySphere:Sphere = new Sphere( "theSphere", 80, 32, 24);
        public function createScene() {
            var g:Group = new Group();
            //復習一下為物體著色吧
            var materialAttr:MaterialAttributes = new MaterialAttributes(
                new LineAttributes( 0.5, 0x2111BB, 0.4 ),
                new LightAttributes( true, 0.1)
                );
            var material:Material = new ColorMaterial( 0xFFCC33, 1, materialAttr );
            material.lightingEnable = true;
            var app:Appearance = new Appearance( material );
           
            mySphere.appearance = app;
           
            g.addChild( mySphere );
            return g;
        }
        public function enterFrameHandler(_evt:Event) {
            mySphere.pan += 1;
            scene.render();
        }
        private function keyPressed(event:KeyboardEvent):void {
         switch(event.keyCode) {
            case Keyboard.PAGE_DOWN:
               scene.light.setPower(scene.light.getPower() - 5);
               break;
            case Keyboard.PAGE_UP:
               scene.light.setPower(scene.light.getPower() + 5);
               break;   
            case Keyboard.UP:
               lightY+=10;
               scene.light.setDirection(lightX, lightY, lightZ);
               break;
            case Keyboard.DOWN:
               lightY-=10;
               scene.light.setDirection(lightX, lightY, lightZ);
               break;
            case Keyboard.RIGHT:
               lightX+=10;
               scene.light.setDirection(lightX, lightY, lightZ);
               break;
            case Keyboard.LEFT:
               lightX-=10;
               scene.light.setDirection(lightX, lightY, lightZ);
               break;
            }
        }
    }
   
}

效果：

出處：藍色理想
責任編輯：bluehearts

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