Cascaded shadows work by dividing viewing area into progressively larger portions and using the same size shadow map on each.
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。
Surface omni - as this source illuminates the surface we put a usual shadow map in Shadows bookmark, so as the shadow from the bump on those planet areas where it will take place is not so sharp.
表面泛光灯——作为星球表面的照明光源，我使用普通的阴影贴图，这样由行星凹凸不平的表面导致的阴影就不会那么锐利。
This we solved by using an opacity map together with affect shadows, which brought along a massive amount of render time.
为了达到这一效果，我们使用了透明贴图和“影响阴影”。
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