P.S. One other little tip in case you go to use a texture with transparency. If you have a plane (let's say) and it has transparency, it will cast a rectangular shadow (ie. disregarding transparency) UNLESS you go to the Materials tab for the object receiving the shadows and go down to Shadow and enable "Receive Transparent". In the above example image, the floor plane must have this set or the shadow on the floor is of the entire sphere (no holes). Also, the inside faces of the sphere would not have been illuminated unless Receive Transparent is set for the sphere as well. This is one that had me pulling my hair out. I had added an object with transparency, but had solid shadows as if the object had no transparency. Finally had the answer, which I share with you here so you don't have to pull out any hair. (at least over that one)
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