欢迎来到天天文库
浏览记录
ID:53759309
大小:615.11 KB
页数:4页
时间:2020-04-24
《二次代数曲面拼接中的光顺处理-论文.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、JournalofComputerApplicationsISSN1001.90812014..07.10计算机应用,2014,34(7):2054—2057CODENJYIIDUhttp://www.joca.cn文章编号:1001—9081(2014)07—2054—04doi:10.11772/j.issn.1001-9081.2014.07.2054二次代数曲面拼接中的光顺处理李耀辉,宣兆成,武志峰,孙原(天津职业技术师范大学信息技术工程学院,天津300222)(}通信作者电子邮箱philliplee@163.con
2、1)摘要:针对直接采用理想交理论得到的拼接曲面在实际中不一定连续的问题,研究如何通过改变拼接曲面的构造方程以得到连续的拼接曲面及其光顺处理。首先,分析了拼接曲面在实际应用不连续的原因,若过渡曲面中含某个变元的项在其他变元满足某个值时变为0,则其与该变元不再相关,在几何图形上会表现为断开;然后,给出了保证拼接曲面在实际应用中连续的方法;之后,讨论了0阶和任意阶拼接曲面的光顺处理方法。对于0阶光滑连续曲面,将辅助曲面作为因子乘以一次函数后补偿到构造方程中的主曲面部分,调节参数使得拼接曲面光顺;对于任意阶连续曲面,在主曲面过渡方程
3、中直接增加补偿函数。该方法可使0阶光滑连续曲面在不提高次数的情况下做到光顺。关键词:代数曲面;结式;拼接曲面;光顺处理中图分类号:TP391.7文献标志码:ASmootheninginsurfaceblendingofquadricalgebraicsurfacesLIYaohui,XUANZhaocheng,WUZhifeng,SUNYuan(SchoolofInformationTechnologyandEngineering,TianjinUniversityofTechnologyandEducation,Tianj
4、in300222,China)Abstract:Tosolvetheproblemofdiscontinuitywhenblendingtwosurfaceswithcoplanarperpendicularaxis,thispaperdiscussedhowtoimprovetheequationsabouttheblendingsurfacesoastoobtainthesmoothandcontinuousblendingSurface.Atfirst,thispaperanalyzedthereasonoftheun
5、continuousnessintheblendingsurfaceandpointedoutthattheitemsinonevariablewereremovedwhenothervariablesequaledtosomespecifiedvalues.Inthiscase,theblendingequationwasindependenttothisvariableinthesevaluesandthisindicatedthatthebelendingsurfacewasdisconnected.Then,amet
6、hodwhichguaranteestheblendingSurfacecountinuouswaspresentedonthebasisofabovediscussion.Besidesthis,thispaperdiscussedhowtosmoothenitoncethecontinuousblendingsurfacewascomputedout.AsfortheGoblendingsurface,regardingthepolynomialofauxiliarysurfaceasafactorthisfactorw
7、asmulitipliedtoafunction{withdegreeoneandtheresultwasaddedtotheprimarysurfacef1.ThesmoothnessofblendingsurfacecanbeimplementedbychangingthecoeficientsinFortheGblendingsurface,acompensatedpolynomialwithdegreeatmost2wasaddedtotheproposedprimaryblendingequationdirectl
8、ywhencomputingblendingsurface.ThismethodsmoothenstheblendingsurfacebutdoesnotincreasethedegreeofGoblendingsurface.Keywords:algebraicsurface;resul
此文档下载收益归作者所有