计算机图形学实验报告班级计算机工硕班学号 **********姓名王泽晶实验五: Phong光照模型实验目的通过本次试验，学生可以掌握简单光照明模型的计算，以及真实感绘制中三维场景搭建的初步知识。

实验内容：对给定的光源、相机状态，对球进行Phong光照明模型绘制。

搭建三维场景：a)在三维空间中摆放1个球，半径为R，默认为50 ，摆放位置为(0,0,0)b)球的材质默认值为Ka = (0.1,0.1,0.1), Kd = (0,0,0.8), Ks = 0.2, n = 10c)视点方向初始为(0,0,1)，光源方向初始为(1,1,1)d)视口设置为x0 = -100, y0 = -75, w = 200, h = 150使用phong模型绘制场景试验步骤：添加成员函数，编写成员数代码为override public function computeIntersection( viewStart:Vec3, viewDir:Vec3):Boolean {// See /geometry/sphereline/var viewEnd:Vec3 = viewStart.add(viewDir);var A:Number = Math.pow(viewEnd.getVec(0) - viewStart.getVec(0), 2)+Math.pow(viewEnd.getVec(1) - viewStart.getVec(1), 2) +Math.pow(viewEnd.getVec(2) - viewStart.getVec(2), 2);var B:Number =((viewEnd.getVec(0) - viewStart.getVec(0)) * (viewStart.getVec(0) - _position.getVec(0)) +(viewEnd.getVec(1) - viewStart.getVec(1)) * (viewStart.getVec(1) -_position.getVec(1)) +(viewEnd.getVec(2) - viewStart.getVec(2)) * (viewStart.getVec(2) -_position.getVec(2))) * 2.0;var C:Number = Math.pow(_position.getVec(0) - viewStart.getVec(0), 2) + Math.pow(_position.getVec(1) - viewStart.getVec(1), 2) +Math.pow(_position.getVec(2) - viewStart.getVec(2), 2) - _radius*_radius;// Solve C + Bt + At^2 = 0var delta:Number = B*B - 4*A*C;if ( delta<0.0 || A==0.0 ) return false;// We don't consider whether 0<t<1 here because real viewer is at infinite place var t1:Number = (-B + Math.sqrt(delta)) / (2*A);var t2:Number = (-B - Math.sqrt(delta)) / (2*A);if ( t1<t2 )point = viewStart.multiplyk(1.0 - t1).add(viewEnd.multiplyk(t1));elsepoint = viewStart.multiplyk(1.0 - t2).add(viewEnd.multiplyk(t2));normal = Vec3.normalize(point.minus(_position));return true;}public var _width :Number =0.0;public var _height:Number = 0.0;public var data:Array = new Array();protected function group1_creationCompleteHandler(event:FlexEvent):void{draw();}public function draw():void{graphics.clear();if(txtViewDir.text == "")return;var ary:Array = txtViewDir.text.split(",");var flag:Boolean = false;for(var i:int= 0;i<ary.length;i++){if(ary[i] == "" || isNaN(ary[i])){flag = true;break;}}if(flag)txtViewDir.setStyle("color",0xff0000);return;}txtViewDir.setStyle("color",0x000000);var viewDir:Vec3 = new Vec3(Number(ary[0]), Number(ary[1]), Number(ary[2]));ary = txtLight.text.split(",");flag = false;for(i= 0;i<ary.length;i++){if(ary[i] == "" || isNaN(ary[i])){flag = true;break;}}if(flag){txtLight.setStyle("color",0xff0000);return;}txtLight.setStyle("color",0x000000);var light:Light = new Light();light.direction = new Vec3(Number(ary[0]), Number(ary[1]),Number(ary[2])).negative();light.ambient = new Vec3(Number(ary[0]), Number(ary[1]), Number(ary[2]));light.intensity = new Vec3(Number(ary[0]), Number(ary[1]), Number(ary[2]));var material:Material = new Material();material.diffuse =new Vec3(0.0, 0.0, 0.8);material.specular =new Vec3(0.2, 0.2, 0.2);material.ambient =new Vec3(0.1, 0.1, 0.1);data = createSceneImage( 200, 150, viewDir, light, material );drawImg();}public function drawImg():void{for(var y:int = 0 ;y<150;y++)for(var x:int =0;x<200;x++){var index:int = (y*200 + x) * 3;var r:Number = data[index+0];var g:Number = data[index+1];var b:Number = data[index+2];var cl:uint =(r << 16) | (g << 8) | b;this.graphics.beginFill(cl)this.graphics.drawCircle(x,y,1);this.graphics.endFill();}}}public function allocateBuffer( width:int,height: int ):Array{var data:Array = new Array();data.length = width * height * 3;_width = width;_height = heightreturn data;}public function createSceneImage( width:int,height: int ,viewDir:Vec3, light:Light, material:Material ):Array{var data:Array = new Array();var sphere:SphereObject = new SphereObject(50.0);sphere.setPosition(new Vec3(0.0, 0.0, 0.0) );sphere.setMaterial( material );var halfW:int = width / 2var halfH:int = height / 2;for ( var y:int=0; y<height; ++y ){for ( var x:int=0; x<width; ++x ){var viewStart:Vec3 = new Vec3(Number(x - halfW), Number(y - halfH), 0.0);if ( puteIntersection(viewStart, viewDir) )sphere.color = puteColor(light, viewDir, sphere.normal);elsesphere.color = new Vec3(0.1, 0.1, 0.1);var index:int = (y*width + x) * 3;data[index+0] = (sphere.color.getVec(0) * 255.0);data[index+1] = (sphere.color.getVec(1) * 255.0);data[index+2] = (sphere.color.getVec(2) * 255.0);}}return data;}protected function button1_clickHandler(event:MouseEvent):void {// TODO Auto-generated method stubdraw();}编译运行得到如下结果：。