dae.as

一个2D基于verlet的Flash物理引擎。它用AS3编写而成。Fisix的目标是应用到游戏等计算量很大的实时应用中。尽管flash比c/c++要慢,很棒的物理引擎

/*
 * PAPER    ON   ERVIS  NPAPER ISION  PE  IS ON  PERVI IO  APER  SI  PA
 * AP  VI  ONPA  RV  IO PA     SI  PA ER  SI NP PE     ON AP  VI ION AP
 * PERVI  ON  PE VISIO  APER   IONPA  RV  IO PA  RVIS  NP PE  IS ONPAPE
 * ER     NPAPER IS     PE     ON  PE  ISIO  AP     IO PA ER  SI NP PER
 * RV     PA  RV SI     ERVISI NP  ER   IO   PE VISIO  AP  VISI  PA  RV3D
 * ______________________________________________________________________
 * papervision3d.org + blog.papervision3d.org + osflash.org/papervision3d
 *
 * Copyright 2006 (c) Carlos Ulloa Matesanz, noventaynueve.com.
 * 
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
 * conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */
 
package org.papervision3d.objects.parsers
{
	import flash.display.BitmapData;
	import flash.events.*;
	import flash.utils.ByteArray;
	import flash.utils.Dictionary;
	import flash.utils.Timer;
	import org.papervision3d.materials.shaders.FlatShader;
	import org.papervision3d.materials.shaders.GouraudShader;
	import org.papervision3d.materials.shaders.LightShader;
	import org.papervision3d.materials.shaders.PhongShader;
	import org.papervision3d.materials.shaders.ShadedMaterial;
	import org.papervision3d.materials.shaders.Shader;
	import org.papervision3d.Papervision3D;
	
	import org.ascollada.ASCollada;
	import org.ascollada.core.*;
	import org.ascollada.fx.*;
	import org.ascollada.io.DaeReader;
	import org.ascollada.types.*;
	import org.ascollada.utils.Logger;
	import org.papervision3d.core.*;
	import org.papervision3d.core.animation.controllers.*;
	import org.papervision3d.core.animation.core.*;
	import org.papervision3d.core.geom.*;
	import org.papervision3d.core.geom.renderables.*;
	import org.papervision3d.core.math.*;
	import org.papervision3d.core.proto.*;
	import org.papervision3d.events.*;
	import org.papervision3d.materials.*;
	import org.papervision3d.materials.shadematerials.*;
	import org.papervision3d.materials.special.*;
	import org.papervision3d.materials.utils.MaterialsList;
	import org.papervision3d.objects.DisplayObject3D;


	import org.papervision3d.objects.parsers.ascollada.Node3D;
	import org.papervision3d.objects.parsers.ascollada.Skin3D;
	import org.papervision3d.materials.special.LineMaterial;

	import org.papervision3d.objects.parsers.ascollada.*;
	import org.papervision3d.lights.PointLight3D;


	/**
	 * @author Tim Knip
	 */
	public class DAE extends DisplayObject3D
	{		
		/** Default scale, used when no scale was set. */
		public static var DEFAULT_SCALE:Number = 100;
		
		/** Full filename. */
		public var filename:String;
		
		/** File title. */
		public var fileTitle:String;
		
		/** Base url. */
		public var baseUrl:String;
		
		/** ASCollada document. @see org.ascollada.core.DaeDocument */
		public var document:DaeDocument;
		
		/** Does the collada contain animations? */
		public var hasAnimations:Boolean = false;
		
		/** The first skin found in the file. */
		public var skin:Skin3D;
		
		/**
		 * 
		 * @param	asset
		 * @param	async
		 * @return
		 */
		public function DAE( async:Boolean = false ):void
		{
			super();
			
			_reader = new DaeReader(async);
			
			this.name = "DAE_" + this.id;
		}
		
		/**
		 * Sets the 3D scale as applied from the registration point of the object.
		 */
		override public function set scale( scale:Number ):void
		{
			super.scaleX = scale;
			super.scaleY = scale;
			super.scaleZ = -scale;
			_loadScaleSet = true;
		}
		
		/**
		 * Gets the 3D scale as applied from the registration point of the object.
		 */
		override public function get scale():Number
		{
			if( super.scaleX == super.scaleY && super.scaleX == -super.scaleZ )
				return super.scaleX;
			else
				return NaN;
		}
		
		/**
		 * Gets the scale along the local Z axis as applied from the registration point of the object.
		 */
		override public function get scaleZ():Number
		{
			return super.scaleZ;
		}
	
		/**
		 * Sets the scale along the local Z axis as applied from the registration point of the object.
		 */
		override public function set scaleZ( scale:Number ):void
		{
			super.scaleZ = -scale;
			_loadScaleSet = true;
		}
		
		/**
		 * Clones this DAE. NOTE: only works for simple dae's. Skinning, animation, etc. is still unsupported.
		 * 
		 * @return	The clone DAE.
		 */
		public function clone():DAE
		{
			var dae:DAE = new DAE();
			
			cloneObj( dae, this._rootNode );
			
			_numClones++;
			
			return dae;
		}
		
		/**
		 * Loads a Collada file from url, xml or bytearray.
		 * 
		 * @param	asset		Url, XML or ByteArray
		 * @param	materials	Optional MaterialsList.
		 */
		public function load(asset:*, materials:MaterialsList = null ):void
		{
			this.materials = materials || new MaterialsList();
			this.buildFileInfo(asset);
			_asset = asset;
			
			if( _asset is ByteArray || _asset is XML )
			{
				if( !this._reader.hasEventListener(Event.COMPLETE) )
					this._reader.addEventListener(Event.COMPLETE, buildScene);
					
				this._reader.loadDocument(_asset);
			}
			else
			{
				doLoad( String(_asset) );
			}
		}
		
		/**
		 * 
		 * @param	url
		 * @return
		 */
		protected function doLoad( url:String ):void
		{
			this.filename = url;
			
			_reader.addEventListener( Event.COMPLETE, buildScene );
			_reader.addEventListener( ProgressEvent.PROGRESS, loadProgressHandler );
			_reader.addEventListener( IOErrorEvent.IO_ERROR, handleIOError,false, 0, true );
			_reader.read(filename);
		}
		
		/**
		 * Gets a child by name recursively.
		 * 
		 * @param	name
		 * @return
		 */
		override public function getChildByName( name:String ):DisplayObject3D
		{
			return findChildByName(this, name);
		}
		
		/**
		 * Replaces a material by its name.
		 * 
		 * @param	material
		 * @param	name
		 * @return
		 */
		public function replaceMaterialByName( material:MaterialObject3D, name:String ):void
		{
			if( !this.materials )
			{
				return;
			}	
			
			var existingMaterial:MaterialObject3D = this.materials.getMaterialByName(name);
			if( existingMaterial )
			{
				if( this.material === existingMaterial )
					this.material = material;
				existingMaterial = this.materials.removeMaterial(existingMaterial);
				existingMaterial.unregisterObject(this);
				
				material = this.materials.addMaterial(material, name);
				
				updateMaterials(this, existingMaterial, material);
			}
		}
		
		/**
		 * Bakes all transforms of a joint into single matrices.
		 * 
		 * @param	joint
		 * @param	channels
		 * @return
		 */
		private function bakeJointMatrices( joint:Node3D, keys:Array, channels:Array ):Array
		{
			var matrices:Array = new Array();
						
			for( var i:int = 0; i < keys.length; i++ )
			{
				var matrix:Matrix3D = Matrix3D.IDENTITY;
				
				for( var j:int = 0; j < joint.transforms.length; j++ )
				{
					var transform:DaeTransform = joint.transforms[j];
					
					// check for a key at this time
					var m:Matrix3D = findChannelMatrix(channels, transform.sid, keys[i]);
					
					if( m )
						matrix = Matrix3D.multiply(matrix, m);
					else
						matrix = Matrix3D.multiply(matrix, new Matrix3D(transform.matrix));
				}
							
				matrices.push(matrix);
			}

			return matrices;
		}
		
		/**
		 * 
		 * @param	joint
		 * @return
		 */
		private function buildAnimations( node:DisplayObject3D ):void
		{				
			var joint:Node3D = node as Node3D;
			
			var channels:Array = null;
			if( joint )
			{
				channels = findAnimationChannelsByID(joint.daeSID);
				if( !channels.length )
					channels = findAnimationChannelsByID(joint.daeID);
			}

			if( channels && channels.length )
			{
				var keys:Array = buildAnimationKeys(channels);
				var baked:Boolean = false;
				
				for( var i:int = 0; i < channels.length; i++ )
				{
					var channel:DaeChannel = channels[i];
					
					// fetch the transform this channel is targeting
					var transform:DaeTransform = findTransformBySID(joint, channel.syntax.targetSID);
				
					if( !transform )
						throw new Error( "no transform targeted by channel : " + channel.syntax.targetSID );
					
					// build animation matrices (Array) from channel outputs
					var matrices:Array = transform.buildAnimatedMatrices(channel);
						
					// #keys and #matrices *should* be equal
					if( matrices.length != channel.input.length )
						continue;
						//throw new Error( "matrices.length != channel.input.length" );

					channel.output = matrices;		
					
					if( channels.length == 1 && transform.type == ASCollada.DAE_MATRIX_ELEMENT )
					{
						// dealing with a matrix node, no need to bake!
						try
						{
							buildAnimationController(joint, keys, matrices);
						}
						catch( e:Error )
						{
							Logger.error( "[ERROR] " + joint.name + "\n" + channel.syntax  );
						}
						baked = true;
						break;
					}
				}
				
				if( !baked )
				{
					// need to bake matrices
					var ms:Array = bakeJointMatrices(joint, keys, channels);
					
					joint.copyTransform(ms[0]);
					
					buildAnimationController(joint, keys, ms);
				}
			}
			
			for each( var child:DisplayObject3D in node.children )
				buildAnimations( child );
		}
		
		/**
		 * 
		 * @param	joint
		 * @param	keys
		 * @param	matrices
		 * @return
		 */
		private function buildAnimationController( joint:Node3D, keys:Array, matrices:Array ):void
		{
			var mats:Array = new Array(matrices.length);
			
			var ctl:SimpleController = new SimpleController(joint, SimpleController.TRANSFORM);
			
			for(var i:int = 0; i < matrices.length; i++)
			{
				var j:int = (i+1) % matrices.length;
				
				mats[i] = matrices[i] is Matrix3D ? matrices[i] : new Matrix3D(matrices[i]);
				
				var keyframe0:int = AnimationEngine.secondsToFrame(keys[i]);
				var keyframe1:int = AnimationEngine.secondsToFrame(keys[j]);
				var duration:uint = j > 0 ? keyframe1 - keyframe0 : 10;
				
				var frame:AnimationFrame = new AnimationFrame(keyframe0, duration, [mats[i]]);
				
				ctl.addFrame(frame);
			}
			
			joint.addController(ctl);
		}
		
		/**
		 * 
		 * @param	channels
		 * @return
		 */
		private function buildAnimationKeys( channels:Array ):Array
		{
			var keys:Array = new Array();
			var tmp:Array = new Array();
			var obj:Object = new Object();
			var i:int, j:int;
			
			for( i = 0; i < channels.length; i++ )
			{
				var channel:DaeChannel = channels[i];
				for( j = 0; j < channel.input.length; j++ )
				{
					if( !(obj[ channel.input[j] ]) )
					{
						obj[ channel.input[j] ] = true;
						tmp.push( {time:channel.input[j]} );
					}
				}
			}
			
			tmp.sortOn("time", Array.NUMERIC);
			
			for( i = 0; i < tmp.length; i++ )
				keys.push( tmp[i].time );
				
			return keys;
		}