【www.bbyears.com--flex】
有时需要在舞台中添加一些背景透明的图片贴图,比如一些标志什么的。
这个就需要设置纹理材质的透明度(alpha 和 alphaThreshold),最后再使用 PlaneGeometry 平面类型的 Mesh 即可。比如,这里有一张背景透明的图片:
把它添加到视图中,效果图如下:
package{
import flash.display.Sprite;
import flash.display.StageAlign;
import flash.display.StageScaleMode;
import flash.events.Event;
import flash.events.MouseEvent;
import away3d.containers.View3D;
import away3d.controllers.HoverController;
import away3d.entities.Mesh;
import away3d.materials.TextureMaterial;
import away3d.primitives.CubeGeometry;
import away3d.primitives.PlaneGeometry;
import away3d.utils.Cast;
[SWF(frameRate="60", backgroundColor="#FFFFFF")]
public class S5 extends Sprite {
private var _view3D:View3D;
private var cameraController:HoverController;//360全景展示相机控制器
//物体 图片(用作方块 的纹理 )
[Embed(source="assets/logo_f10.png")]
private var logoClass:Class;
//地板图片(用作地板的纹理 )
[Embed(source="assets/road.jpg")]
private var floorClass:Class;
//logo材质
private var logoMaterial:TextureMaterial;
//地板材质
private var floorMaterial:TextureMaterial;
private var _lastX:Number = 0;
private var _lastY:Number = 0;
public function S5() {
initEngine();
initMaterials();
initObjects();
initListeners();
}
/**
* 初始化引擎
*/
private function initEngine():void
{
stage.scaleMode = StageScaleMode.NO_SCALE;
stage.align = StageAlign.TOP_LEFT;
// 创建一个视口
_view3D = new View3D();
_view3D.antiAlias = 4; //设置抗锯齿级别
//初始化摄像头
cameraController = new HoverController(_view3D.camera);
/*cameraController.distance = 1000;
cameraController.minTiltAngle = 0;
cameraController.maxTiltAngle = 90;
cameraController.panAngle = 45;*/
cameraController.tiltAngle = 15;
addChild(_view3D);
}
/**
* 初始化材质
*/
private function initMaterials():void
{
//地板的纹理
floorMaterial = new TextureMaterial(Cast.bitmapTexture(floorClass));
//logo的纹理
logoMaterial = new TextureMaterial(Cast.bitmapTexture(logoClass));
logoMaterial.alpha = 1
logoMaterial.alphaThreshold=0.5 //图片背景透明
}
/**
* 初始化物体
*/
private function initObjects():void
{
// 在三维舞台中创建一个方块(地板 )
var cube1:Mesh = new Mesh(new CubeGeometry(500, 20, 300), floorMaterial);
_view3D.scene.addChild(cube1);
// 在三维舞台中创建一个平面的logo
var logo:Mesh = new Mesh(new PlaneGeometry(128, 128), logoMaterial);
//(logo.geometry as PlaneGeometry).doubleSided = true; //双面 贴图
logo.y = 100;
logo.rotationX = 90;
logo.rotationZ = 180;
_view3D.scene.addChild(logo);
}
/**
* 初始化监听
*/
private function initListeners():void
{
addEventListener(Event.ENTER_FRAME, _onEnterFrame);
//鼠标事件监听
stage.addEventListener(MouseEvent.MOUSE_DOWN, onMouseDown);
stage.addEventListener(MouseEvent.MOUSE_UP, onMouseUp);
stage.addEventListener(MouseEvent.MOUSE_WHEEL,onWheel);
stage.addEventListener(Event.RESIZE, onResize);
onResize();
}
/**
* 渲染视图
*/
private function _onEnterFrame(e:Event):void
{
//渲染视图
_view3D.render();
}
/**
* 使用舞台大小一直全屏
*/
private function onResize(event:Event = null):void
{
_view3D.width = stage.stageWidth;
_view3D.height = stage.stageHeight;
}
/**
* 鼠标滚轮事件
*/
private function onWheel(e:MouseEvent):void
{
if(e.delta > 0){
if(cameraController.distance < 1000)
cameraController.distance += 100;
}else{
if(cameraController.distance > 600)
cameraController.distance -= 100;
}
}
/**
* 鼠标按下事件
*/
private function onMouseDown(event:MouseEvent):void
{
_view3D.stage.addEventListener(MouseEvent.MOUSE_MOVE, mouseMoveHandler);
_lastX = _view3D.mouseX;
_lastY = _view3D.mouseY;
}
/**
* 鼠标弹起事件
*/
private function onMouseUp(event:MouseEvent):void
{
_view3D.stage.removeEventListener(MouseEvent.MOUSE_MOVE, mouseMoveHandler);
}
/**
* 鼠标移动事件
*/
private function mouseMoveHandler(event:MouseEvent):void
{
//移动摄像机
var dx:Number = _view3D.mouseX - _lastX;
var dy:Number = _view3D.mouseY - _lastY;
cameraController.panAngle += dx;
cameraController.tiltAngle += dy;
_lastX = _view3D.mouseX;
_lastY = _view3D.mouseY;
}
}
}