POV-Ray : Newsgroups : povray.binaries.utilities : Wood program but still develop : Re: Wood program but still develop Server Time
7 Jul 2022 02:53:55 EDT (-0400)
  Re: Wood program but still develop  
From: And
Date: 14 May 2022 02:35:00
Message: <web.627f4c975b6ed24a7adfb56aa81652d@news.povray.org>
"Bald Eagle" <cre### [at] netscapenet> wrote:
> "And" <49341109@ntnu.edu.tw> wrote:
> > Thanks. I'm trying to generate small speckles.
> >
> > It is an emphasis, too.
> >
> > And I'm thinking how composite this to the base color. I use "average" in this
> > picture. But this method is fail to more requirements. Sometimes speckles should
> > darker than the base color. the method cannot control it well.
> I think that this is going to be another advanced-granite texture odyssey.
> You will probably need to use functions, and some way to introduce noise, in
> order to randomize those color variations in the growth rings.

I always use functions, till the pigment composite.

> If you're going to tackle that, I'd probably start by making a list of common
> features of real wood, and think about how to implement each of those, and where
> they need to be in a hierarchy.

Yes, I'm dealing with it.

> Different growth ring thicknesses. (one ring vs another)

It has done, notice the program manipulate video 0:12 ~ 0:29, it control the
radial growth speed vs year.
Than program output the year_vs_r function using select(r - r0, , ...),
than composite them to time_function(x, y, z) with angular distortion.

> Variable growth ring thickness (change in thickness along any given ring)

This is a good idea, I think I should add it.

> Asymmetric growth ring thickness. (a bent or curved branch will be thick on one
> side and thin on the other)

Not uniform ring thickness I wonder how to implement. Basically, if it can
implement in POV-Ray, than it can do in principle. My Java program can output
some data and it can be numerous like the attachment.

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