POV-Ray : Newsgroups : povray.binaries.images : Wood grain : Re: Wood grain Server Time
14 Jul 2024 06:44:16 EDT (-0400)
  Re: Wood grain  
From: And
Date: 14 Jul 2023 02:50:00
Message: <web.64b0ef456808bc77ee1d8e88aa81652d@news.povray.org>
"Chris R" <car### [at] comcastnet> wrote:
> Maybe this is an obvious trick to some of the veterans here, but I thought it
> was an interesting way to get good color maps for wood, so here it goes.
>
> I was working on some wood flooring for a scene and found a site called
> wood-database.com that has images and information on lots of different types of
> wood, including images of lumber made from the types of wood.
>

Thanks for the information.
I browse wood-database.com and found that is a good reference.

> I downloaded an image of the wood I wanted to replicate in my scene, (the lower
> left inset in the image below), and imported it into GIMP.  In the Colors/Info
> menu there is a "Smooth Palette" option that creates a palette of the colors in
> the image, (seen to the right of the inset).  I exported that as a JPEG and then
> used some macros I created to pull out the POV-ray colors from the image.  I
> have used both interpolation and non-interpolation for different effects.  I
> then use those colors, in the order given, to create the color map for the wood
> texture.
>
> Coming up with the wood pigment and warps is still mostly trial and error, but
> the sample is actually pretty close.
>


I have developed (but still not complete all features) a Java program to warp/
countrol the wood shape.

http://news.povray.org/povray.binaries.utilities/thread/%3Cweb.62b9d31097c0f8e9cf20f667aa81652d%40news.povray.org%3E/

It can edit the curve using mouse to create the shape.
I will continue the development.


> The three boards are rendered using variations on the color map.  The center one
> is non-translated and unaltered.  The right has been lightened, and the grain
> was selected randomly from a normal-sized pine tree.  The left was grayed by
> aging, and also randomly selected.
>
> In this particular example, I only sampled the colors from a single ring of the
> wood pattern.  For others, the colors vary across rings, so it works better to
> use all of the colors in the color map, but scale the pigment so the ring sizes
> stay the same.
>
> Anyway, I'm finding this is a lot easier than my usual hit or miss method of
> creating a wood colormap, and allows for greater variation in the colors, which
> enhances realism.
>
>
> -- Chris R.


color is another question when I conceive developing my program. So I will
consult your method.


Post a reply to this message

Copyright 2003-2023 Persistence of Vision Raytracer Pty. Ltd.