Unity使用阴影贴图来显示阴影。

Unity USES so called shadow maps to display shadows.

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级联阴影通过分割可视区域逐步部分变大，并使用相同的大小，在每个阴影贴图。

Cascaded shadows work by dividing viewing area into progressively larger portions and using the same size shadow map on each.

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通常使用聚光灯，配合阴影贴图来渲染头发。

Usually using spotlights with shadow maps are ideal for hairs.

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