即使沒有檢測到標記，FLARToolKit中的3D對象仍會出現

Question

我還有一個關於FLARToolKit的（新手）問題。 這是Lee Brimelow的代碼，用於在標記上製作3個盒子。

package { 

import flash.display.BitmapData; 
import flash.display.Sprite; 
import flash.events.Event; 
import flash.media.Camera; 
import flash.media.Video; 
import flash.utils.ByteArray; 

import org.libspark.flartoolkit.core.FLARCode; 
import org.libspark.flartoolkit.core.param.FLARParam; 
import org.libspark.flartoolkit.core.raster.rgb.FLARRgbRaster_BitmapData; 
import org.libspark.flartoolkit.core.transmat.FLARTransMatResult; 
import org.libspark.flartoolkit.detector.FLARSingleMarkerDetector; 
import org.libspark.flartoolkit.support.pv3d.FLARBaseNode; 
import org.libspark.flartoolkit.support.pv3d.FLARCamera3D; 
import org.papervision3d.lights.PointLight3D; 
import org.papervision3d.materials.shadematerials.FlatShadeMaterial; 
import org.papervision3d.materials.utils.MaterialsList; 
import org.papervision3d.objects.primitives.Cube; 
import org.papervision3d.render.BasicRenderEngine; 
import org.papervision3d.scenes.Scene3D; 
import org.papervision3d.view.Viewport3D; 

[SWF(width="640", height="480", frameRate="30", backgroundColor="#FFFFFF")] 

public class FLARdemo extends Sprite 
{ 
    [Embed(source="pat1.pat", mimeType="application/octet-stream")] 
    private var pattern:Class; 

    [Embed(source="camera_para.dat", mimeType="application/octet-stream")] 
    private var params:Class; 

    private var fparams:FLARParam; 
    private var mpattern:FLARCode; 
    private var vid:Video; 
    private var cam:Camera; 
    private var bmd:BitmapData; 
    private var raster:FLARRgbRaster_BitmapData; 
    private var detector:FLARSingleMarkerDetector; 
    private var scene:Scene3D; 
    private var camera:FLARCamera3D; 
    private var container:FLARBaseNode; 
    private var vp:Viewport3D; 
    private var bre:BasicRenderEngine; 
    private var trans:FLARTransMatResult; 

    public function FLARdemo() 
    { 
     setupFLAR(); 
     setupCamera(); 
     setupBitmap(); 
     setupPV3D(); 
     addEventListener(Event.ENTER_FRAME, loop); 
    } 

    private function setupFLAR():void 
    { 
     fparams = new FLARParam(); 
     fparams.loadARParam(new params() as ByteArray); 
     mpattern = new FLARCode(16, 16); 
     mpattern.loadARPatt(new pattern()); 
    } 

    private function setupCamera():void 
    { 
     vid = new Video(640, 480); 
     cam = Camera.getCamera(); 
     cam.setMode(640, 480, 30); 
     vid.attachCamera(cam); 
     addChild(vid); 
    } 

    private function setupBitmap():void 
    { 
     bmd = new BitmapData(640, 480); 
     bmd.draw(vid); 
     raster = new FLARRgbRaster_BitmapData(bmd); 
     detector = new FLARSingleMarkerDetector(fparams, mpattern, 80); 
    } 

    private function setupPV3D():void 
    { 
     scene = new Scene3D(); 
     camera = new FLARCamera3D(fparams); 
     container = new FLARBaseNode(); 
     scene.addChild(container); 

     var pl:PointLight3D = new PointLight3D(); 
     pl.x = 1000; 
     pl.y = 1000; 
     pl.z = -1000; 

     var ml:MaterialsList = new MaterialsList({all: new FlatShadeMaterial(pl)}); 

     var Cube1:Cube = new Cube(ml, 30, 30, 30);     
     var Cube2:Cube = new Cube(ml, 30, 30, 30); 
     Cube2.z = 50 
     var Cube3:Cube = new Cube(ml, 30, 30, 30); 
     Cube3.z = 100 

     container.addChild(Cube1); 
     container.addChild(Cube2); 
     container.addChild(Cube3); 

     bre = new BasicRenderEngine(); 
     trans = new FLARTransMatResult(); 

     vp = new Viewport3D; 
     addChild(vp); 
    } 

    private function loop(e:Event):void 
    { 
     bmd.draw(vid); 

     try 
     { 
      if(detector.detectMarkerLite(raster, 80) && detector.getConfidence() > 0.5) 
      { 
       detector.getTransformMatrix(trans); 
       container.setTransformMatrix(trans); 
       bre.renderScene(scene, camera, vp); 
      } 
     } 
     catch(e:Error){} 
    } 
} 

該代碼的缺陷是，在檢測到標記後，是，3D對象得到渲染。但是在沒有檢測到標記後，對象仍然出現在屏幕上（即使它沒有移動） 我該如何解決這個問題？

Answer 1

你必須改變FLARBaseNode的Visible屬性在檢測條件

if(detector.detectMarkerLite(raster, 80) && detector.getConfidence() > 0.5){ 
        detector.getTransformMatrix(trans); 
        container.setTransformMatrix(trans); 
      container.visible = true; 
        bre.renderScene(scene, camera, vp); 
       }else 
       container.visible = false;