Mike Horvath <mik### [at] gmail com> wrote:
> The area light is necessary to create the fuzzy shadows. (Otherwise
> shadows would have a sharp edge and the lighted regions would be larger
> than the shadow regions IIRC.)
What if you gave the shadow squares a bit of transparency at the edges to allow
the formation of a penumbra on the ring? It's a cheap cheat, but it may go
WAAAY faster.
Also Martijn just posted this recently:
https://www.shadertoy.com/view/WsyBDz
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