在中间层，可移植的图形引擎提供对线的绘制、区域的填充、多边形、裁剪以及颜色模型的支持。

At the middle level, a portable graphics engine provides support for line draws, area fills, polygons, clipping, and color models.

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分割-在运行时，在底层细节的多边形模型的基础上，提升直观的多边形数量。

To increase at runtime the number of visible polygons from a low detail polygonal model.

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如果你仔细观察低分模型的边缘，你可以看出一些多边形的不同之处。

If you look at the edges of the low-detail model, you can start to make out some of the polygons. Below is a close-up of some of the silhouette simplifications in the character's neck.

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