CAJ | 학술논문

本文首先介绍B样条曲线，并推广到B样条曲面及B样条体，然后在此基础上介绍直接操作自由变形技术(Direct Manipulation of Free Form Deformation)，将此技术应用于曲面模型上，使得物体发生变形。在此基础上，对直接操作自由形式变形进行了改进，提出了以Nurbs曲线作为变形基函数的变形方法；并且讨论了Nurbs曲线的控制点和权因子的改变对变形的影响；然后，结合Nurbs曲线控制点和权因子的变化，完成DMFFD变形；最后，比较了以Nurbs作为变形基函数与以B-spline作为变形基函数变形的不同。实验结果表明，改进后的DMFFD变形有更好的选择性和自主性。
본문수선개소B양조곡선，병추엄도B양조곡면급B양조체，연후재차기출상개소직접조작자유변형기술(Direct Manipulation of Free Form Deformation)，장차기술응용우곡면모형상，사득물체발생변형。재차기출상，대직접조작자유형식변형진행료개진，제출료이Nurbs곡선작위변형기함수적변형방법；병차토론료Nurbs곡선적공제점화권인자적개변대변형적영향；연후，결합Nurbs곡선공제점화권인자적변화，완성DMFFD변형；최후，비교료이Nurbs작위변형기함수여이B-spline작위변형기함수변형적불동。실험결과표명，개진후적DMFFD변형유경호적선택성화자주성。
This paper ifrstly introduces a B-spline curve, and extended to B-spline surfaces, as well as B-spline volume. Then describes the direct manipulation of free form deformation, and apply this technology to the surface model to make the model deform. On this basis, the direct manipulation of free form deformation is improved .and Propose a Nurbs curve as a basis function. Further, Discusses the Nurbs curve of control points and weights change effect on the deformation. Next, with the change in weight and control point Complete the deformation. Finally, compared to B-spline as deformation basis functions, Deformation in Nurbs basis functions has different deformation results. The experimental results show that the improved direct manipulation of free form deformation has better selectivity and autonomy.