Flash3D编程技巧：物体环视浏览器（Away3D）-优快云博客

本文介绍了一种使用HoverCamera3D实现3D视图中相机交互的方法，包括初始化相机属性、监听鼠标事件以控制相机旋转角度，并通过帧更新来平滑过渡到新位置。

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定义一些以后会用到的变量：

private var View:View3D;

// HoverCam controls
private var camera:HoverCamera3D;
private var lastMouseX:Number;
private var lastMouseY:Number;
private var lastPanAngle:Number;
private var lastTiltAngle:Number;
private var move:Boolean = false;

增加一个HoverCamera3D并且设置它为视图要使用的camera：

camera = new HoverCamera3D({zoom:2, focus:100, distance:250});
View = new View3D({camera:camera,x:250, y:200});

设置camera的一些初始属性值：

camera.targetpanangle = camera.panangle = 45;
camera.targettiltangle = camera.tiltangle = 20;
camera.mintiltangle = -90;

启用ENTER_FRAME侦听器：

addEventListener(Event.ENTER_FRAME, onEnterFrame);

启用鼠标按下、释放侦听器：

this.stage.addEventListener(MouseEvent.MOUSE_DOWN, MouseDown);
this.stage.addEventListener(MouseEvent.MOUSE_UP, MouseUp);

鼠标按下的时候，需要记录下camera的一些当前参数：

private function MouseDown(event:MouseEvent):void
{
    lastPanAngle = camera.targetpanangle;
    lastTiltAngle = camera.targettiltangle;
    lastMouseX = stage.mouseX;
    lastMouseY = stage.mouseY;
    move = true;
}

鼠标释放的时候，需要停止渲染场景：

private function MouseUp(event:MouseEvent):void
{
    move = false;
}

where 'the magic' happens：重新计算新的camera位置

private function onEnterFrame(e:Event):void
{
    // rerender viewport
    var cameraSpeed:Number = 0.3; // Approximately same speed as mouse movement.
    if (move) {
        camera.targetpanangle = cameraSpeed*(stage.mouseX - lastMouseX) + lastPanAngle;
        camera.targettiltangle = cameraSpeed*(stage.mouseY - lastMouseY) + lastTiltAngle;
    }
    camera.hover();
    View.render();
}