简介:
简介:AnewmethodisproposedforsurfaceconstructiononirregularquadmeshesasextensionstouniformB-splinesurfaces.Givenanumberofcontrolpoints,whichformaregularorirregularquadmesh,aweightfunctionisconstructedforeachcontrolpoint.TheweightfunctionisdefinedonalocaldomainandisC1continuous.Thenthewholesurfaceisconstructedbytheweightedcombinationofallthecontrolpoints.ThepropertyofthenewmethodisthatthesurfaceisdefinedbypiecewiseC1bi-cubicrationalparametricpolynomialwitheachquadface.ItisanextensiontouniformB-splinesurfacesinthesensethatitsdefinitionisananalogyoftheB-splinesurface,anditproducesauniformbi-cubicB-splinesurfaceifthecontrolmeshisaregularquadmesh.Examplesproducedbythenewmethodarealsoincluded.
简介:<正>2007年2月7日,索尼爱立信在北京发动了春季攻势,一举发布了8款新机,这其中包括两款Cyber-shot拍摄手机K550c和K818c、四款低端产品K200c、K220c、J110c和J120c和两款Walkman音乐新机W888c和W610c。近日,索爱K200c也以超低价正式登陆市场,上市的价格仅仅是898元。索尼爱立信K200c是一款直板机型,其在设计上摆脱了索尼爱立信一贯的设计。小巧的机身和适宜的重量,适合各类人群使用。并且K200c还将索爱旗下在国内上市的第一款集成挂机键和通话键的手机,按键的变化必将涉及到操作方式的改变。到底索爱K200c有何独到之处呢?