即编程实现阴影产生物(shadow-casting geometry)的轮廓边(silhouette edge)的确定。轮廓边在龙书的动画勾边例子中就提到了，它是从光源的
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利用抽取轮廓边的算法将边跟踪算法从CAD模型扩展到一般的面片模型。
Extending the type of model in edge-based tracking from CAD model to general mesh model by extracting the silhouette from the 3D model.
阐述了定位销和定位孔引起工件的定位误差对零件轮廓边切割偏差的影响机理。
This paper expatiated on the influencing mechanism of part's outline cutting deviation due to the locating faults owing to the locating pins and locating holes.
先用一把好铲子在草地上划出花园的轮廓。你的孩子可以把草皮拉开，把它放在一边用作堆肥。
With a good shovel, you can cut an outline of the garden in the grass. Your child can then pull the sod away and set it aside it for composting.
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