基于OpenGL的参数曲面上任意点的交互选取研究

提出了一种实现参数曲面上任意点选取的有效方法。通过屏幕坐标与物体坐标之间的交换 ,利用求解空间一点到曲面最近点的算法 ,经过求解直线与参数曲面的交点 ,成功地实现了参数曲面上任意点的选取 ,避免了求解高次方程组。运行结果表明 ,该方法稳定可靠 ,应用在工程中可取得令人满意的结果

Research of interactiveselection of arbitrary point on OpenGL based parametric curved surface

An effective method was brought forward to realize interactive selection of arbitrary point on parametric curved surface. By the exchanging between screen coordinate and object coordinate, and by the use of the algorithm of calculating the distance from a space point to the curved surface to solve the intersection point of a strightline and the curved surface, it successfully realized selecting arbitrary point on parametric curved surface. So it avoided solving high power equation group. Calculation results indicated that this method was stable and reliable. The method could be applied in engineering and the result would be desirable.