> mone wrote:
>> I tried this function and it can generate textures suitable for the
>> heightfield
>> very quickly, thanks for the code! I tried some changes with the color
>> map in
>> the code, and wonder if it's possible to change it in a way, that you
>> don't get
>> a gradient, but only a white on black pattern?
>
> Sure, you can squeeze the color_map values together, but the jaggies
> will look much worse.
>
>> Because all kinds of gradients, which at first I hoped would maybe
>> result in a
>> rounded or bevelled looking edge in the heightfield instead made it
>> looking
>> either jagged or make some strange sort of tiny stripes on the
>> heightfield
>> walls.
>> So I removed the gradients in Photoshop (which can handle 16bit
>> grayscale png)
>> and put a gray border around the white edge without antialiasing.
>> It still looked a little jagged but a lot better than with the gradients.
>
> Whatever works :)
>
> Do you know about sin/cos functions? With them, you can make polygonal
> shapes with any number of sides. For instance, to make a 6-sided prism
> you can use sin/cos like so:
>
> prism{
> -1,1,7,
> <sin(pi*2/6*0),cos(pi*2/6*0)>,
> <sin(pi*2/6*1),cos(pi*2/6*1)>,
> <sin(pi*2/6*2),cos(pi*2/6*2)>,
> <sin(pi*2/6*3),cos(pi*2/6*3)>,
> <sin(pi*2/6*4),cos(pi*2/6*4)>,
> <sin(pi*2/6*5),cos(pi*2/6*5)>,
> <sin(pi*2/6*0),cos(pi*2/6*0)> // closing the hexagon
> pigment{rgb 1}
> }
>
> Essentially, sin/cos functions map a circle. By studying this code, you
> can figure out how to make polygons with any number of sides. You can
> apply it towards other objects, like cylinders and spheres to make
> skeletal frameworks.
>
>> Yes. I had searched "hexagon" in the documentation, but I hadn't found
>> the code
>> in the functions.inc, because it's abbreviated to "hex" there and it
>> didn't show
>> up in the search result. I should definitely read more in the doc, but
>> the
>> problem is, before I'm even partly through I've already forgotten
>> completely
>> about what I had read in the beginning. I'm not good at memorizing
>> things. I
>> remember I had read through the functions.inc half a year or so ago,
>> but I
>> didn't even remember there was this hex-function in there.
>
> Learning POV-Ray is daunting, to be sure. It is helpful to create mini
> projects for yourself, to learn how different features work. Also, it
> might be helpful to have a testing scene file with camera, lights,
> background, etc. to test things out in. I always keep such a file
> around, as well as a texture-making scene for trying out new
> pattern-related things.
>
>>> I released some hexagonal patterns a while back, you might want to check
>>> them out:
>>>
http://news.povray.org/povray.binaries.scene-files/message/%3C482478cb%40news.povray.org%3E/#%3C482478cb%40news.povra
>>>
>> y.org%3E
>>
>> Yes they look groovy :)
>> The little yellow star thing inspired me to try to make a whole field
>> of sphere
>> sweep hexagons in a row with a while loop. But I still haven't figured
>> out the
>> correct distance between them.
>
> I included two functions and two variables in the include file for
> working in trigonal space, you might want to check them out. With them,
> you can find the correct distances :) They are called: h1, h2, ht(x,y),
> ht2(x,y).
>
>> Alain <aze### [at] qwertyorg> wrote:

>>>
>>> You can use a small tile that you use many times. That tile only covers
>>> one complete hex and just enough of 4 adjacent ones to create a
>>> continous pattern when tilled. That smaller tile can have much finner
>>> grain than a single one covering the whole thing.
>>
>> I thought I could use tiles only with textures/pigments and so on. I
>> don't know
>> how to put them on heightfields? Because in the documentation I didn't
>> found any
>> "repeat" statement in the description for heightfields, so I thought
>> tiles are
>> not possible. But maybe I missed some essential point, it wouldn't be
>> the first
>> time :).
>
> I think he might have been talking about making a basic height_field
> tile, like this (Thunderbird might put a line directly through the
> hexagon):
> ____
> / \
> __/ \__
> \ /
> \____/
>
>
> It's a height_field with only one hexagon, an object you can place in a
> nested #while loop to make a larger honeycomb. You can use the
> previously mentioned variables and functions from my hex patterns
> include file to scale the hexagon correctly.
>
> Sam

That's exactly what I had in mind.


Alain

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