The algorithm based on C Tree can complete the polygon selection and combination operation in high efficiency for given large scale polygon map layer and small output scale.
对于给定的大比例尺地图多边形图层数据，该算法可以高效率地完成多边形选取与合并的综合操作，输出小比例尺地图图层数据。
When a texture map representing an uneven surface is applied to a flat polygon, the surface appears to get flattened.
当使用材质贴图在光滑的多边形上表现一个粗糙的表面时，那个表面看起来像是平坦的。
Note that you can change the coordinates to map any part of the texture to any part of the polygon face.
你可以通过修改纹理坐标来使用任意的部分覆盖多边形表面。
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