How exactly does one cast a shdow onto an hdri light probe image - since most
are cube or sphere mapped images?
Does one map a non-emmisive copy just inside the emissive one acting as a light
source? Just wondering how to make it reasonably seamless, as the scenes I've
seen so far are on tables or other occluding surfaces.
This just occurred to me:
Can I add a y-gradient to the finish {} block, going from emission 0 to 1?
Thanks!
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