"Bald Eagle" <cre### [at] netscapenet> wrote:
> "Fractracer" <lg.### [at] gmailcom> wrote:
>
> > Maybe one #if statement can make the job, with #if (abs(_X) <= 1)
>
> yes, excellent.
> I'll replace my kludge tonight with:
>
> #if (abs(_X) <= 1)
>      #declare _X = sgn(_X);
> #end

If I am not wrong, I think that sgn() only return 1 or -1, in this case I
believe it is better to do:

 #if (abs(_X) > 1)
      #declare _X = sgn(_X);
 #end

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"Fractracer" <lg.### [at] gmailcom> wrote:

> If I am not wrong, I think that sgn() only return 1 or -1,

Yes, sorry - I read what I wanted to read, or what I was expecting to read - not
what was actually there.
You understood what I meant even though I copied-and-pasted the conditional.

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"Bald Eagle" <cre### [at] netscapenet> wrote:
> "Fractracer" <lg.### [at] gmailcom> wrote:
>
> > If I am not wrong, I think that sgn() only return 1 or -1,
>
> Yes, sorry - I read what I wanted to read, or what I was expecting to read - not
> what was actually there.
> You understood what I meant even though I copied-and-pasted the conditional.

It is the end of the week, I made also some mistakes, due to fatique and speed
of action. And yes I understood :).

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Final (...) rendering.

All ideas, advices, tips, etc.., are welcome for improve the scene.

An unexpected crack in the shadows appear...

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Attachments:
Download 'inside_wall_000.png' (2964 KB)

Preview of image 'inside_wall_000.png'

On 19-11-2017 14:25, Fractracer wrote:
> 
> Final (...) rendering.
> 
> All ideas, advices, tips, etc.., are welcome for improve the scene.
> 
> An unexpected crack in the shadows appear...
> 

I like this, no question.

-- 
Thomas

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"Fractracer" <lg.### [at] gmailcom> wrote:
> "Bald Eagle" <cre### [at] netscapenet> wrote:
> > IIRC, I found a great little feather macro a few years ago.
> > I can't seem to find it online, but I can check on my laptop at home.
> >
>
> I have found this in newsgroup but the link is dead.
>
>
http://news.povray.org/povray.binaries.images/message/%3C39ea2c56%40news.povray.org%3E/
>
> I have made a feather for my picture but only one side is good.

you may try

https://web.archive.org/web/20050905225952/http://baillp.free.fr/feather.html

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"Kontemplator" <haf### [at] yahoocom> wrote:
> you may try
>
> https://web.archive.org/web/20050905225952/http://baillp.free.fr/feather.html

Thank you for the link, but I already had it (Bald Eagle gave it to me in a
previous post). This feather is good  but is not in the way I want.
Actually Bald Eagle works on the maths of the Baillehache' macro, and I also try
to modified the macro.

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