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雕塑实体     
相关语句
  sculptured solid
     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
短句来源
  sculptured solids
     Distributed Algorithm for Mass Property Computation of Sculptured Solids
     雕塑实体物性计算的分布式算法
短句来源
     A Distribute Algorithm for Boolean Operations of Sculptured Solids Based on a Heterogeneous LAN
     一个基于异构型局域网的雕塑实体布尔操作并行算法
短句来源
  sculptured object
     FEATURE DESCRIPTION OF SCULPTURED OBJECT BASED ON PATH ENVELOPMENT
     基于轨迹包络的雕塑实体特征描述
短句来源
  “雕塑实体”译为未确定词的双语例句
     Research of Mapping Between Sculpture and Polyhedral Solid Models
     雕塑实体模型与多面体实体模型映射的研究
短句来源
     A new visual method for 3D reconstruction of the free - form surfaces
     雕塑实体计算机视觉建模方法研究
短句来源
     After analyzing general data structure of curved solid modeling, it proposes a Boolean operation algorithm for motional curved solid modeling, the goal of algorithm is to ensure effectively robustly and accurately.
     在分析以往雕塑实体模型数据结构的基础上,本文给出了一个运动雕塑实体布尔操作算法,在保证鲁棒性和精确性的同时确保高效率是算法的目标。
短句来源
     The topology and geometry of solid is represented by trimmed curve surface and half-edge data structure.
     雕塑实体模型通过裁剪曲面片和半边数据结构来表达几何和拓扑信息。
短句来源
     It applies the continuous SSI mentioned above to motional solid Boolean operation, and uses the similarity of intersect curve to simplify SSI problem, it can save computation time.
     结合前面提到的连续变化曲面求交算法,在原有雕塑实体布尔操作的基础上,把连续变化曲面求交技术应用到运动雕塑实体布尔操作中,利用连续运动中曲面交线相似性进行求交简化,加快布尔操作计算时间,加入对连续运动实体的特殊处理,提升了运动雕塑实体布尔操作的计算效率。
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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.
          
      sculptured object
    A Path Interval Generation Algorithm in Sculptured Object Machining
          
    A feature modeller for sculptured object modelling
          
    Feature modelling for a sculptured object consists of two basic elements: features and modelling operations.
          


    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.

    In this paper, an algorithm for Boolean operation between sculptured models is presented and the accuracy, efficiency and robustness are the main considerations. The solid model is represented with the trimmed parametric patches and half edge data structure. Hierarchy intersection is applied for unified classification, and tracing the intersection curve to overcome degenerate cases occurring frequently in practice is also used. It can easily be extended to Boolean operations for non manifold models. The algorithm...

    In this paper, an algorithm for Boolean operation between sculptured models is presented and the accuracy, efficiency and robustness are the main considerations. The solid model is represented with the trimmed parametric patches and half edge data structure. Hierarchy intersection is applied for unified classification, and tracing the intersection curve to overcome degenerate cases occurring frequently in practice is also used. It can easily be extended to Boolean operations for non manifold models. The algorithm as a part of a modeling system on a SGI workstation is implemented.

    给出了一个雕塑实体布尔操作的实现算法,在保证效率和精确性的同时确保鲁棒性是算法的目标.实体模型通过裁剪曲面片和半边数据结构来表达几何和拓扑信息.采用了层次求交和交线跟踪的方法来保证曲面片分割和区域分类的一致性,从而克服实践中常见的退化情况.该算法也可以方便地扩展到非流形模型的布尔操作.作为一个实体造型系统的一部分,该算法已经在SGI工作站上实现.

    This paper presents an accurate intersection method for Boolean operation of sculptured models. For the considerations of accuracy, efficiency and robustness, a hybrid intersection method is employed. Surface intersection using tracing method based on predicted topology, and hierarchy intersection are applied for unified classification, and tracing the intersection curve to overcome degenerate cases that occur frequently in practice. A geometric modeler TigerSurf on Windows/NT platform have been implemented...

    This paper presents an accurate intersection method for Boolean operation of sculptured models. For the considerations of accuracy, efficiency and robustness, a hybrid intersection method is employed. Surface intersection using tracing method based on predicted topology, and hierarchy intersection are applied for unified classification, and tracing the intersection curve to overcome degenerate cases that occur frequently in practice. A geometric modeler TigerSurf on Windows/NT platform have been implemented and perfect results have been gained through massive tests.

    提出了一个雕塑实体布尔操作中的精确求交算法.为了确保该算法的高效率、精确性和鲁棒性,采用了先确定拓扑、再跟踪的策略来进行曲线-曲面求交,以及层次求交和交线跟踪的方法,来保证裁剪曲面片分割和区域分类的一致性,从而克服实践中常见的退化情况。该算法已经在一个基于Windows/NT平台的雕塑实体造型器TigerSurf上实现,并通过大量造型实例的测试。

     
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