At runtime,through interaction with user,concave regions under consideration were detected and skeletons of them were extracted using a heuristic searching method. Combining skeletons with contours and adding illumination effects shapes can be illustrated with a hand-made appearance.
该算法在预处理阶段利用离散化的曲率计算方法来估计模型顶点的平均曲率;在交互阶段,首先根据用户提供的平均曲率阈值检测模型的凹区域,同时通过设计启发式搜索算法来提取该区域适宜的线条,然后结合计算即可得到模型轮廓线,并在绘制时考虑虚拟光照效果,绘制结果表明,可以得到较满意的结果。
参考来源 - 基于NPR的3维模型线绘算法 in C·2,447,543篇论文数据，部分数据来源于NoteExpress
The deformation of the micro-holes can be obviated by arranging ribs and concave regions on the lamp-box fabric so as to keep good sound absorption performance.
利用灯箱布的凸筋和凹区保证微穿孔不受压变形，保持其良好的 吸声性；
To make the exiting routing algorithms tolerate concave fault regions without disabling any healthy nodes, the concept of "Hole" is proposed in this paper.
“洞”的提出是为了弥补现有容错路由算法无法容忍凹型故障区域的不足。
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