papervision3d拖拽圆球

代码如下：

 

package
{
	import flash.events.Event;
	import flash.events.MouseEvent;
 
	import org.papervision3d.core.geom.renderables.Vertex3D;
	import org.papervision3d.core.math.Number3D;
	import org.papervision3d.core.math.Plane3D;
	import org.papervision3d.events.InteractiveScene3DEvent;
	import org.papervision3d.lights.PointLight3D;
	import org.papervision3d.materials.shadematerials.FlatShadeMaterial;
	import org.papervision3d.objects.primitives.Sphere;
	import org.papervision3d.view.BasicView;
 
	[SWF(width="640", height="480", backgroundColor="#000000", frameRate="60")]
	public class DraggingASphere extends BasicView
	{
		private const NUM_SPHERES:int = 11;//声明球的个数
		private var planeToDragOn:Plane3D;
		private var currentSphere:Sphere;
 
		private var light:PointLight3D;
 
		public function DraggingASphere()
		{
			viewport.interactive = true;
 
			camera.y = 400;
 
			light = new PointLight3D(true);
			scene.addChild(light);
 
			for(var i:int = 0; i < NUM_SPHERES; i++)
			{
				var material:FlatShadeMaterial = new 

                                                                           FlatShadeMaterial(light, 0xeeeeee, 0x2d2d2d, 10);
				material.interactive = true;
				var sphere:Sphere = new Sphere(material);
				sphere.x = (i - NUM_SPHERES/2) * 200;
 
				scene.addChild(sphere);
 
				sphere.addEventListener(InteractiveScene3DEvent.

                                                                                                OBJECT_PRESS, objectPressHandler);
				stage.addEventListener(MouseEvent.

                                                                                                MOUSE_UP, mouseUpHandler);
			}
 
			var up:Number3D = new Number3D(0, 1, 0);
			planeToDragOn = new Plane3D(up, new Number3D(0,0,0));
 
			startRendering(); 	
		}
 
		private function objectPressHandler(event:InteractiveScene3DEvent):void
		{
			currentSphere = event.displayObject3D as Sphere;
		}
 
		private function mouseUpHandler(event:MouseEvent):void
		{
			currentSphere = null;
		}
		override protected function onRenderTick(event:Event=null):void
		{
			var ray:Number3D = camera.unproject

                                         (viewport.containerSprite.mouseX, viewport.containerSprite.mouseY);
			ray = Number3D.add(ray, camera.position);
 
			var cameraVertex3D:Vertex3D = new Vertex3D

                                                                                                    (camera.x, camera.y, camera.z);
			var rayVertex3D:Vertex3D = new Vertex3D(ray.x, ray.y, ray.z);
 
			var intersectPoint:Vertex3D = planeToDragOn.getIntersectionLine

                                                                                              (cameraVertex3D, rayVertex3D);
 
			if(currentSphere)
			{
				currentSphere.x = intersectPoint.x;
				currentSphere.y = intersectPoint.y;
				currentSphere.z = intersectPoint.z;
			}
			light.x = intersectPoint.x;
			light.y = intersectPoint.y + 100;
			light.z = intersectPoint.z;
 
			renderer.renderScene(scene, camera, viewport);
		}
	}
}

 

（来自papervision3d官方网）