凹型区域 Concave domain
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
同时评估旁中心凹区域的视网膜脉管系统。
The retinal vasculature in the parafoveal region was assessed.
曲面交线、曲面内凹区域及曲面中浅平面的加工是曲面加工的难点。
Surface intersections, concaves and shallow planes of the curved surface are difficult to machine.
曲面交线、曲面内凹区域及曲面中浅平面的加工是曲面加工中的难点。
The line of intersection, inward concave and shallow area of curved surface are the difficult points in curved surface machining.
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