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sculptured solid
相关语句
  雕塑实体
     Research on the Relate Technology of Continuous Surface-surface Intersection for Sculptured Solid Modeling System
     雕塑实体造型系统中连续变化求交问题的相关技术研究
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  相似匹配句对
     On Solid Biomechanics
     关于生物固体力学
短句来源
     Solid Camera
     固体摄象机
短句来源
     Research on the Relate Technology of Continuous Surface-surface Intersection for Sculptured Solid Modeling System
     雕塑实体造型系统中连续变化求交问题的相关技术研究
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     SCULPTURED COATING AND IT'S APPLICATION
     浅谈喷塑涂料与施工
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  sculptured solid
A sculptured solid may also be defined by using a beta-spline curve for the sweep polygon and a cubic B-spline curve for the sweep trajectory.
      


Parametric surfacelsurface intersection methods are essential in a sculptured solid modelingsystem- To improve the robustness, accuracy and topological consistence, an algorithm extendedfrom ideas in [1] and in [3] is described in this paper. Including a new rnethod for obtaining the sur-face near points; an appropriate method for estimating the marching step length; and a reliablernethod for determining singular points. Furthermore, our algorithm can evaluate intersections between offset surfaces without...

Parametric surfacelsurface intersection methods are essential in a sculptured solid modelingsystem- To improve the robustness, accuracy and topological consistence, an algorithm extendedfrom ideas in [1] and in [3] is described in this paper. Including a new rnethod for obtaining the sur-face near points; an appropriate method for estimating the marching step length; and a reliablernethod for determining singular points. Furthermore, our algorithm can evaluate intersections between offset surfaces without offset approximation. These ideas are discussed and implemented in anintegrated CADICAM system. Tested by rnany typical examples , they have been proved to be robustand efficient. Some exarnples are provided.

PARAMETRICSURFACE/SURFACEINTERSECTIONZengXianglin;WangQifu;ZhouJi;YuJunPARAMETRICSURFACE/SURFACEINTERSECTION¥ZengXianglin;Wan...

Parametic surface/surface intersect ion methods are essential in a sculptured solid modelling system. To improve the robustness, accuracy and topological consistency, an algorithm extended from ideas in [Houghton etal.' 85] and in [Barnhill et al.'90 is described in this paper. our changesinClude:a new method for obtaining the surface near points, an appropriatemethod for estimating the marching step length;and a reliable method fordetermining singular points. Fur thermore,our algorithm can evaluateintersections...

Parametic surface/surface intersect ion methods are essential in a sculptured solid modelling system. To improve the robustness, accuracy and topological consistency, an algorithm extended from ideas in [Houghton etal.' 85] and in [Barnhill et al.'90 is described in this paper. our changesinClude:a new method for obtaining the surface near points, an appropriatemethod for estimating the marching step length;and a reliable method fordetermining singular points. Fur thermore,our algorithm can evaluateintersections between offset surfaces fithout offset approximation.These ideasare discussed in this paper, and have been inplemented in an intergrated CAD/CAMsystem. Tested by many typical examples, they have proved robust and efficient.Some examples are provided.

参数曲面求交是雕塑实体造型中的关键问题.为了提高曲面/曲面求交方法的稳定性、准确性以及拓扑一致性,本文提出了一种改进方法,它是[Houghtonatal.‘85]和[Barnhillatal.’90]的思想的延伸.在本算法中,提出了获取曲面临近点的新方法和确定分支点的可靠方法,改进了确定追踪步长的方法.此外,它可以方便地计算出等距曲面的交线而无需等距逼近.通过上述改进本算法可以处理分支点、切环、自交由线、以及等距由面交线.所有这些思想均已在一个CAD/CAN系统中实现,经过许多典型考题的测试证明:它是一种稳定且有效的方法.其中一些考题附在本文末尾.

To fulfill the demand of some time-critical operations, we presented a distribute algorithm for Boolean operations of sculptured solids. The algorithm exploits parallelism at all stages of the Boolean operation between sculptured solids, and made a good compromise with the relevancy of the topological entities involved in. And different load balancing strategy is used according to different kinds of the distribute tasks undertaken. The algorithm can distribute the notoriously computation cost of Boolean operations...

To fulfill the demand of some time-critical operations, we presented a distribute algorithm for Boolean operations of sculptured solids. The algorithm exploits parallelism at all stages of the Boolean operation between sculptured solids, and made a good compromise with the relevancy of the topological entities involved in. And different load balancing strategy is used according to different kinds of the distribute tasks undertaken. The algorithm can distribute the notoriously computation cost of Boolean operations between complex sculptured solids on a heterogeneous LAN, and have been implemented in a heterogeneous LAN which is composed by 10 PentiumII/350 PCs and 5 SGI O2 workstations. A good degree of parallel computation can get from the experiment datum. The algorithm is used in a modeling kernel for a feature-based parametric modeling system named GS-CAD, and is able to interactively evaluate the boundaries of Boolean operations of complex sculptured solid in average 3-4 seconds. It can also be easily extended to collision detection algorithm between sculptured solids.

为了在某些限时操作下得到实时交互的速度 ,提出了一个分布式的雕塑实体模型布尔操作并行算法 .该算法在各个阶段抽取的并行性和原串行算法的拓扑相关性之间采取了折中的策略 ,并对于不同的并行任务 ,采用了不同的任务均衡手段 .该算法已经在一个由 10台 P /35 0微机和由 5台 SGI O2工作站组成的异构型局域网上得到实现 .实验结果显示 ,该算法获得了理想的加速比 ,对于复杂雕塑实体的造型 ,操作平均可在 3s~ 4 s完成 ,因此能满足实时交互的需要 .

 
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