2009年11月28日

G
eoinformatics会议明年6月18~20号要来北大开了,论文EI检索,赶紧投啊赶紧投啊!

The Geoinformatics conference series was initiated by the International Association of Chinese Professionals in Geographic Information Sciences (CPGIS) in 1992. This annual international conference has provided a unique forum for exchanging ideas and knowledge on geo-information sciences between GIS professionals worldwide. The 18th International Conference on Geoinformatics (Geoinformatics 2010) will be held on June 18-20, 2010 at Beijing, China. The conference is co-organized by Peking University, Capital Normal University, and the International Association of Chinese Professionals in Geographic Information Sciences (CPGIS), and co-sponsored by the Geographical Society of China. The Institute of Remote Sensing and Geographical Information Science of Peking University is the local organizer of the conference.

The conference theme is “GIScience in Change.” It will provide an unprecedented opportunity for professionals and students from remote sensing, Geoinformation science, and related disciplines to discover cutting-edge geoinformatics technology and applications, while at the same time exchanging their ideas, research results, professional experiences, and future visions in the fields of geographic information science, remote sensing, and their applications.

The conference will include plenary, special, oral, and poster sessions. Please consider submitting your abstracts and papers to the sessions most suitable for exchanging your ideas and research with similar researchers.

The Organization Committee would like to invite all interested parties to propose special sessions for Geoinformatics 2010. Special session Chairs can propose full sessions (10 papers) or half sessions (5 papers). The Session chairs are responsible for inviting the papers and ensuring these papers are submitted via the normal conference referee process.
If a Special Session lacks enough papers to complete the time allotment, additional papers can be selected from the general paper submissions.

Abstracts and Papers:
Participants are invited to submit original, unpublished research contributions or experience reports not concurrently submitted elsewhere. All abstracts must be 300-500 words long and written in English. They will be refereed for quality, originality, and relevance by the program committee. The first call is for an extended abstract. Authors of the accepted abstracts will be invited to submit full papers to be published in an EI-indexed conference proceeding. Some selected papers will be published in special issues of SCI-indexed journals.

Please submit abstracts online at http://cn.geoinformatics2010.org. Abstracts must include title, authors (Firstname Surname), indicating the presenter by underlining their name and providing author's contact details: affiliations, department, full address (street, city, state/province, and country), telephone, fax, and Email.

Important Dates:
Session Proposal Deadline: December 10, 2009
Session Proposal Acceptance Notice: December 17, 2009
Abstract Deadline: January 30, 2010
Abstract Acceptance Notice: February 20, 2010
Full paper Deadline: April 7, 2010
Registration Deadline: April 20, 2010

地图图片
2008年04月01日

o
k,长话短说,废话不说。

所谓的三维模型优化有两个方面:

1,对于模型来说,减少三维模型的点、线、面的数目

2,对于贴图来说,使用UV贴图并减小贴图的大小。 

当我们用Maya/3dMax/犀牛等三维软件建立了三维模型之后如何对其进行优化呢? 

第一,建模技巧

比如楼房,多楼层的楼房可以用一个box来代替;删除模型中的多余面;单个物体的面数不能很多;如果可以用贴图来表现复杂模型就不要用模型;将占用大块区域的模型拆减成小模型减轻系统压力。

第二,贴图技巧

最好不要用零散的多贴图,因为在系统加载贴图的时候如果贴图过多会增加硬盘的交互。使用一个UV贴图会减少交互,将其交给显存后就让它自己算去吧,有利于性能提升。

第三,软件优化

对于模型,我们可以使用Deep Exploration来对其进行优化,这是一个极牛的软件。可以使用电驴搜索下载,这里就不提供下载了。对于贴图用ACDSee就好了,推荐使用3.1美化版。当然,如果能用photoshop装上DDS插件做成dds格式的贴图那是最棒的。

以上三点是对三维模型进行优化我能考虑到的三个方面的方法,如果大家谁还有更好的办法欢迎相互交流!

PS:用Google/baidu搜索“三维模型优化方法”都搜不出来东西....汗! 

2007年12月19日

段时间和奇志通公司合作做北大的建筑物模型,给公司10几个人做了Maya的建模培训讲座,公司 的人很聪明,几堂课下来已经对基本的建模操作和UV贴图很熟悉了。前几天拿到了公司做的北大的上百个模型,其中不乏尤其优秀的模型,比如图书馆。模型非常简化,利用UV透明贴图很好地表现了细节,在简化度和模型细节展现方面达到了平衡,堪称经典之作!

北大图书馆模型北大图书馆

之前在大二的时候做过石龙镇的模型,遇到过Maya导出.x文件的问题,当时Google半天没Google到,两年了,现在Google还是没什么结果。我把自己在Maya导出.x文件的过程记录下来,留作备份,也给大家参考。下面开始了~

=============I'm a line, spliting line!===========

No1 安装Microsoft DirectX SDK (August 2006)。其实我们只是为了获取其中对Maya(6、6.5、7)的支持插件。我把它打包放在本站了,可以在这里下载。如果你是安装的,插件在这个路径下(C:\Program Files\Microsoft DirectX SDK (August 2006)\Utilities\Bin\PlugIns\Maya)

注意是August 2006以前版本的才可以。否则你会遇到这个错误“ error x3539: ps_1_x is not supported in this version of the compilermemory(125,23): ID·DXEffectCompiler::CompileEffect: there was an error compiling
expression ID3DXEffectCompiler: Compilation failed
”。就是说之后的版本不知为何不能很好支持Maya了。可以在msdn上看详细的介绍。

No2 打开来看(以Maya 7为例),有三个文件夹,分别是Icons、Plug-ins、Scripts。将其中的文件对应放入Maya安装目录相应的文件夹下,对应关系如下。(左边是你下载下来的文件,右边是Maya对应的文件夹)

Icons ======== BrushIcons(C:\Program Files\Alias\Maya7.0\brushShapes\BrushIcons)

Plug-ins ======= plug-ins(C:\Program Files\Alias\Maya7.0\bin\plug-ins)

Scripts ======= scripts(C:\Program Files\Alias\Maya7.0\scripts)

No3 在C盘Program Files(假设你的Maya安装在这里)中创建一个叫做x86的文件夹,然后把这了路径(C:\Program Files\Microsoft DirectX SDK (August 2006)\Utilities\Bin\x86)下的dxcc.dll 放到刚才新建的文件夹下。好!现在准备工作完成!

No4 打开Maya,Window—Settings/Preferences—Plug-in Manager,把下图画红线的那两个勾勾上,然后退出Maya,再次进入就大功告成了!

当你做好一个模型,在File下点击Export All,在下面的文件下是不是多了一个导出.x文件的属性~还有一点需要说明,开着这个插件用Maya会比较慢,所以在做模型的时候最好不开,就是不选那个勾。如果你觉得你的Maya脑子混乱了,那就把MyDocument下Maya文件夹下的7.0的那个文件夹删掉,那里存的是我们的设置。

maya导出.x文件插件图

关于.x文件到底是什么,我会过段时间再发一篇blog说明。

2007年11月09日

日突然想起SkyLine,这其实是一家GIS公司,国外的。g.cn了一下"Skyline gis"发现了这家叫做泰瑞数创科技(北京)有限公司的GIS公司,它是SkyLine在中国的代理。在其网站逛来又逛去,偶然间发现了一幅图

不知大家发现了没有,上面有个错别字,优化被写成了忧化。

于是乎用起Gmail给其公司些邮件,发现在浏览器端死活无法贴图。。。

最后只能右键复制了下图像,然后到邮件正文粘贴了。

也不知道为什么Gmail不给提供邮件正文贴图的功能,在邮件收发客户端都是可以的。。。

唉,不过也无所谓了,一年到头也贴不了几个图,谁让Gmai这么好用呢。