package org.papervision3d.materials{	import flash.display.BitmapData;	import flash.display.Graphics;	import flash.display.Sprite;	import flash.geom.Matrix;		import org.papervision3d.core.geom.renderables.Triangle3D;	import org.papervision3d.core.material.TriangleMaterial;	import org.papervision3d.core.render.data.RenderSessionData;	import org.papervision3d.core.render.draw.ITriangleDrawer;	public class BitmapWireframeMaterial extends TriangleMaterial implements ITriangleDrawer	{		private static const BITMAP_WIDTH:int = 64;		private static const BITMAP_HEIGHT:int = 64;				private var uvMatrix:Matrix;				protected static var _triMatrix:Matrix = new Matrix();		protected static var _localMatrix:Matrix = new Matrix();				public function BitmapWireframeMaterial(color:Number=0xFF00FF, alpha:Number=1, thickness:Number=3)		{			bitmap = new BitmapData(BITMAP_WIDTH,BITMAP_HEIGHT,true,0x00000000);			lineColor = color;			lineAlpha = alpha;			lineThickness = thickness;			init();		}				private function init():void		{			createBitmapData();			createStaticUVMatrix();		}				override public function drawTriangle(face3D:Triangle3D, graphics:Graphics, renderSessionData:RenderSessionData, altBitmap:BitmapData = null, altUV:Matrix=null):void		{			if(bitmap){				var x0:Number = face3D.v0.vertex3DInstance.x;				var y0:Number = face3D.v0.vertex3DInstance.y;				var x1:Number = face3D.v1.vertex3DInstance.x;				var y1:Number = face3D.v1.vertex3DInstance.y;				var x2:Number = face3D.v2.vertex3DInstance.x;				var y2:Number = face3D.v2.vertex3DInstance.y;								_triMatrix.a = x1 - x0;				_triMatrix.b = y1 - y0;				_triMatrix.c = x2 - x0;				_triMatrix.d = y2 - y0;				_triMatrix.tx = x0;				_triMatrix.ty = y0;									_localMatrix.a = uvMatrix.a;				_localMatrix.b = uvMatrix.b;				_localMatrix.c = uvMatrix.c;				_localMatrix.d = uvMatrix.d;				_localMatrix.tx = uvMatrix.tx;				_localMatrix.ty = uvMatrix.ty;				_localMatrix.concat(_triMatrix);								graphics.beginBitmapFill( bitmap, _localMatrix, tiled, smooth);				graphics.moveTo( x0, y0 );				graphics.lineTo( x1, y1 );				graphics.lineTo( x2, y2 );				graphics.lineTo( x0, y0 );				graphics.endFill();				renderSessionData.renderStatistics.triangles++;			}					}				private function createBitmapData():void		{			var sprite:Sprite = new Sprite();			var graphics:Graphics = sprite.graphics;									graphics.lineStyle(lineThickness,lineColor,lineAlpha);			graphics.moveTo( 1, 1 );			graphics.lineTo( BITMAP_WIDTH-1,1 );			graphics.lineTo( BITMAP_WIDTH-1,BITMAP_HEIGHT-1);			graphics.lineTo( 1, 1 );			graphics.endFill();						bitmap.draw(sprite);					}				private function createStaticUVMatrix():void		{			var w  :Number = BITMAP_WIDTH;			var h  :Number = BITMAP_HEIGHT;			var u0 :Number = w;			var v0 :Number = 0;			var u1 :Number = 0;			var v1 :Number = 0;			var u2 :Number = w;			var v2 :Number = h;						// Precalculate matrix & correct for mip mapping			var at :Number = ( u1 - u0 );			var bt :Number = ( v1 - v0 );			var ct :Number = ( u2 - u0 );			var dt :Number = ( v2 - v0 );			uvMatrix = new Matrix( at, bt, ct, dt, u0, v0 );			uvMatrix.invert();		}				override protected function destroy():void		{			super.destroy();			bitmap.dispose();		}			}}