rectangleparticleculler.as.svn-base

ActionScript写的3D图片展示功能

package org.papervision3d.core.culling
{
	import org.papervision3d.core.geom.renderables.Particle;
	import flash.geom.Rectangle;
	import flash.geom.Point;
	import org.papervision3d.core.geom.renderables.Vertex3DInstance;

	import flash.utils.getTimer;
	
	import org.papervision3d.core.geom.renderables.Vertex3D;	

	public class RectangleParticleCuller implements IParticleCuller
	{
		private static var vInstance:Vertex3DInstance;
		private static var testPoint:Point;
		
		public var cullingRectangle:Rectangle;
		
		public function RectangleParticleCuller(cullingRectangle:Rectangle = null)
		{
			this.cullingRectangle = cullingRectangle;
			testPoint = new Point();
		}
		
		public function testParticle(particle:Particle):Boolean
		{
			vInstance = particle.vertex3D.vertex3DInstance;
			//trace(getTimer(), "rectangleparticleculler",vInstance.z, vInstance.visible );
			
			// TODO I don't trust the speed of the built-in Rectangle.intersects function - 
			// and have a fast algorithm so I'll write a new intersect function! [Seb]
			if(particle.material.invisible == false){
				if(vInstance.visible)
				{
					if(particle.renderRect.intersects(cullingRectangle))
					{
						return true; 
					}
				}
			}
			return false;
		}
		
		
		
	}
}