Am 22.01.2019 um 02:33 schrieb Bald Eagle:
> I just got done fiddling with an idea.
> First, I'm curious how an internal/predefined function like f_noise3d still need
> functions.inc.

POV-Ray knows a couple of inbuilt functions.
It doesn't know them by any name though, just by internal numbers.

There's a special syntax to assign names to those internal numbers, 
which is exactly what `functions.inc` is doing.


> Second - here's a noise-based normal function,
> S is scale of the pattern
> D is a small delta shift for the 3x3 sampling grid
> 
> 0.01 seems to be where things shift from one weird version to another.
> large values give some interesting repeating "ghosts" almost like a repeat warp,
> and small values give closer to the native function (D=0) which has very well
> defined "rings" which are much softer at D=0.1

My guess is that it's some interference between your oversampling of the 
normal and the normal's internal sampling.

BTW, while working on the parser source code I just noticed that there's 
a parameter to control the "resolution" of the internal sampling, called 
`accuracy`. It defaults to 0.02, which explains why it's at this order 
of magnitude that strange things kick in.

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