kurtz le pirate <kur### [at] gmailcom> wrote:
> Hello,
>
> Little brain teaser...
>
> So, how to remove this shadow on the floor but keep the shadow on the wall ?
>
> --

That is indeed an interesting situation.

After reading the various suggestions here, I experimented with different
set-ups, and finally found one that works. It uses two light sources: a
shadowless one in a light_group with the large horizonal disc, and another light
for everything else. The no_shadow flag is not needed in any of the objects.

---

plane{...}

// light_source A
light_source {...}

light_group{
// light_source B
light_source {  // same position as light_source A
....
  shadowless
}

// large horizontal disc
cylinder{...}
} // end of light_group

// sundial CSG
union{
box{...}

// gnomon
cylinder{...}
}

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