On 2025-05-27 19:27 (-4), Lars Rohwedder wrote:
> I tried some magic with inside() and isosurface, but povray does not
> like even the simplest terms involving the inside() function, see
> attached scene file snippet:
> 
> ---<snip>---

I think ABX hinted at the answer in the 2002 thread: inside() is not
listed in the syntax diagram for user-defined functions.  The
documentation reads, "only float functions that apply to float values
may be used," but inside()'s arguments are not floats.

https://wiki.povray.org/content/Reference:Function

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