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用魔术橡皮擦快速更换图片的背景
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基于Pro/E二次开发齿轮参数化模型库
传统的CAD系统所构造的产品模型都是几何图素(如点、线、圆等)的简单堆叠,仅仅描述了设计产品的可视化形状,而不包含设计者的设计思想,因此难以对产品模型进行改动,并生成新的产品实例。目前很多企业为缩短产品开发周期,大部分产品的设计都是改进型设计,大约70%的新产品的设计都要重新利用原来的产品模型,于是参数化设计的概念在这样的背景下应运而生。 Pro/Engineer是采用参数化设计的、基于特征的三维实体造型系统,其参数化特征造型在保证几何、拓扑关系不变的情况下,以单一全关联的数据库实现模型的快速再生;它的二次开发接口使用户可以在自己开发的程序中对零件进行各种操作和控制,从而实现程序化设计。 一、Pro/Engineer二次开发参数化设计的基本原理 Pro/Program是Pro/Engineer软件提供的一种程序化的二次开发工具。利用Pro/Engineer造型的同时,Pro/Program会产生特征的program,它是一个记录文件,由类似BASIC的高级语言构成,记录着模型树(modeltree)中每个特征的详细信息,包括各个特征的建立过程、参数设置、尺寸以及关系式等,我们可以通过修改和添加特征的program来生成基本参数相同的一系列模型。 利用Pro/Program对Pro/Engineer软件进行二次开发时不需要重新撰写设计步骤,只需加入几个相关的语法指令就可以让整个零件或组件变得弹性化与多样化,其主要思想是利用Pro/Program模块的功能来接收、换算和传递用户输入的有关参数,通过改变特征的尺寸及特征之间的关系来达到参数化设计的目的。这里需要注意的是,开发工作的关键在于确定独立可变参数,应尽量以最少的参数来确定整个零件的可变尺寸,并通过参数化尺寸驱动实现对设计结果的修改。 二、基于Pro/Program二次开发参数化设计建立零件库的步骤 1.分析零件,提取其关键参数,然后设置参数,并确定驱动参数 因为在参数化设计时不仅要实现尺寸的驱动变化,还要实现结构形状的局部变化,所以要在对零件进行分析以后才能确定
巧妙提取Flash文件中的素材
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用PhotoShop给皱褶T恤添加图案
由于T恤衫表面是有褶皱的,因此衣服上的图案文字也会相应产生变形,怎样使添加的图案文字的变形与褶皱一致呢?这里我们需要用到扭曲/置换滤镜,学会了这个技巧你就可以更真实的把图片文字等加到凹凸不平的表面上了 原图效果图 具*作步骤如下:一、导入原始图片,并复制一个图层副本,如下;
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Photoshop将画面处理细腻润泽
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PS手绘封面美女
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this.alt='Click here to open new window\nCTRL+Mouse wheel to zoom in/out';}" onclick="if(!this.resized) {return true;} else {window.open('UploadFiles/200602/20068753757919.jpg');}" src="/Files/photo/2007-4/2/074215445397985.jpg" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt='Click here to open new window\nCTRL+Mouse wheel to zoom in/out';}" border=0>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor='hand'; this.alt='Click here to open new window\nCTRL+Mouse wheel to zoom in/out';}" onclick="if(!this.resized) {return true;} else {window.open('UploadFiles/200602/20068753757725.jpg');}" src="/Files/photo/2007-4/2/074215445358414.jpg" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt='Click here to open new window\nCTRL+Mouse wheel to zoom in/out';}" border=0>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor='hand'; this.alt='Click here to open new window\nCTRL+Mouse wheel to zoom in/out';}" onclick="if(!this.resized) {return true;} else {window.open('UploadFiles/200602/20068753758319.jpg');}" src="/Files/photo/2007-4/2/074215445360064.jpg" onload="if(this.width>screen.width*0.7) {this.resized=true; 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this.style.cursor='hand'; this.alt='Click here to open new window\nCTRL+Mouse wheel to zoom in/out';}" onclick="if(!this.resized) {return true;} else {window.open('UploadFiles/200602/20068753758370.jpg');}" src="/Files/photo/2007-4/2/074215445375088.jpg" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt='Click here to open new window\nCTRL+Mouse wheel to zoom in/out';}" border=0>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor='hand'; this.alt='Click here to open new window\nCTRL+Mouse wheel to zoom in/out';}" onclick="if(!this.resized) {return true;} else {window.open('UploadFiles/200602/20068753759981.jpg');}" src="/Files/photo/2007-4/2/074215445310919.jpg" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt='Click here to open new window\nCTRL+Mouse wheel to zoom in/out';}" border=0>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor='hand'; 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钢笔教程
photoshop钢笔练习十步曲钢笔练习十步曲!a、b、c分别代表钢笔的三个控制点如下:。...........。.............。a............b...............c1、按住CTRL 鼠标点b 然后拖动 观察现象并记住此功能。2、按住CTRL 鼠标点a或c 然后拖动 观察现象并记住此功能。3、按住ALT 鼠标点b 观察现象并记住此功能。4、按住ALT 鼠标点a或c 然后拖动 观察现象并记住此功能。5、画下一个节点时按住SHIFT 观察现象并记住此功能。6、画下一个节点时按住CTRL 观察现象并记住此功能。7、画下一个节点时按住SHIFT 不松鼠标拖动 观察现象并记住此功能。8、回到以绘完的接点(就是b),按住ALT点b 观察现象并记住此功能。然后不松并拖动观察现象并记住此功能。9、回到以绘完的接点(就是b),按住CTRL点b 并拖动观察现象并记住此功能。10、不用键盘,单独用鼠标绘制,观察现象并记住此优点。你只要把这10步练习5遍,你将会成为扣图高手!扣图中的小问题,小技巧:a\绘制中修改节点后,点一下最后的节点,然后接着绘制,这样不会另起一条路径.b\闭合路径后直接按CTRL+回车将路径变为选区.c\在路径面版下面,有把选区变为路径的按纽,变为路径后输出AI格式,可到AI里直接调用.
豪宅变成鬼屋效果教程
在菜单上选择:图像?调整?色调/饱和度,将房屋边缘的颜色调整成屋顶的颜色。接下来要算是教程中最为复杂的部分,因为我们需要手绘出房屋缺失的部分。为了达到这样的目的我主要使用了仿制图章工具,这个工具可以使你将图片的其他部分当作参考。比如:底层和中间窗户之间的瓦片是借助屋顶的瓦片绘制出来的。
妙手回春-逆转不透明度
如下图,我们要做的就是上面半透明的一层(大且复杂的一个水印)去掉,还原底图的原貌。(注:下面图层的运算实际上是RGB值的运算) 这好比我们从一个地方走到另外一个地方,需要返回,最安全可靠的方法就是沿原路走回去。先看看我们是怎么走过来的!不透明度混合原理:覆盖图层以X%的不透明度和底图混合,得到的混合图等于覆盖图层乘以X%再加上底图乘以(1-X%)。 如何走回去就不言自明:底图等于混合图减去覆盖层乘x%之后再除以(1-X%),但是我们只能找到覆盖层的原图,并且不知道它是以多大的不透明度混合的怎么办?不要紧,我们后面会把不透明度找出来。