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1·They only have differences in map sizes and grades of the bump.

它们只在地图尺寸和凹凸的程度上有所不同。

2·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。