first test of a cobblestone street

stones are isofunctions (f_superellipsoid + f_rigged_mf) placed on a heightfield 
generated based on a pigment.

the sand between the stone still needs work (texture, debris, grass)

light is a simple point light (it's just a geometry+texture test)

any suggestions ????

... dave

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Attachments:
Download 'cobblestone_test.jpg' (101 KB)

Preview of image 'cobblestone_test.jpg'

SORRY ...

posted the wrong image.
THIS is the on with isofunctions (f_superellipsoid + f_rigged_mf) the former 
contains only superellipsoids.
Hope the difference is noteable ...

...dave

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Attachments:
Download 'cobblestone_test2.jpg' (106 KB)

Preview of image 'cobblestone_test2.jpg'

Hello.

David El Tom <dav### [at] t-onlinede> wrote:
> THIS is the on with isofunctions (f_superellipsoid + f_rigged_mf) the former
> contains only superellipsoids.
> Hope the difference is noteable ...

 Yes. The second one looks "nibbled by years" :)

 I like sand, it looks very real. But I think, the stones colour and
grainnes should vary slightly.
 Sincerely Yours,
 Alex  Kluchikov.

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"Alex Kluchikov" <klk### [at] ukrnet> wrote in message
news:web.440c378d1e090c9e578f59590@news.povray.org...
> Hello.
>
> David El Tom <dav### [at] t-onlinede> wrote:
> > THIS is the on with isofunctions (f_superellipsoid + f_rigged_mf) the
former
> > contains only superellipsoids.
> > Hope the difference is noteable ...
>
>  Yes. The second one looks "nibbled by years" :)
>
>  I like sand, it looks very real. But I think, the stones colour and
> grainnes should vary slightly.
>  Sincerely Yours,
>  Alex  Kluchikov.
>
>

The texture is interesting, but perhaps more castlewall, or decorative
paver.
Real cobblestones are somewhat rounded and used to bear traffic.
Originally they were derived from local river stone.
e.g.
http://www.pmb.ox.ac.uk/images/tour/TourOutside1.jpg
They age/wear to become smoothe and shiny. See e.g.
http://www.miksang.net/galleries/gal_waynewilliams/pages/Dublin-Cobble-Stone.html
For a description of distinctions between cobbled other forms of flint stone
paving see
http://www.jbsv.co.uk/norfolkflint.htm

DLM

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> any suggestions ????
>
> ... dave
>
look my last irtc participation at:
http://www.irtc.org/ftp/pub/stills/2005-06-30/untitled.jpg
my isosurfaces were placed using trace() over an height_field i made with
photoshop
I hope that perhaps it serves as inspiration or aid you.
--
light_source{0,1}#macro C(r,p)cylinder{x*-2,x*2,.9 pigment { rgb
p} /* B Gimeno estoeslarealidad */ rotate p*90 } #end difference
{box {-1,1} C(z /* http://usuarios.lycos.es/game2413 */,x)C(x,y)
C(z,z) pigment{rgb 2} rotate 45 translate z*4} // www.povray.org

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Both images are impressive.

It looks like it could do with more AA (or just a bigger image size), 
but basically... it looks pretty good!

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David El Tom spake:

> first test of a cobblestone street
> 
> stones are isofunctions (f_superellipsoid + f_rigged_mf) placed on a
> heightfield generated based on a pigment.
> 
> the sand between the stone still needs work (texture, debris, grass)
> 
> light is a simple point light (it's just a geometry+texture test)
> 
> any suggestions ????
> 
> ... dave

The stones look a bit grainy - how about turning up AA (as another poster
suggested) and maybe fiddling with the texture to remove the black bits?

-- 
Stefan Viljoen
Software Support Technician / Programmer
Polar Design Solutions

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David El Tom <dav### [at] t-onlinede> wrote:
> SORRY ...
>
> posted the wrong image.
> THIS is the on with isofunctions (f_superellipsoid + f_rigged_mf) the former
> contains only superellipsoids.
> Hope the difference is noteable ...
>
> ...dave

I think the overall shape of the stones is great, but the finishing could be
a bit better. I think that the stones would be more polished after being
used a bit. Making them a bit smoother and shinier should do the trick.

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DLM wrote:

> The texture is interesting, but perhaps more castlewall, or decorative
> paver.

To be honest, the texture is lend from stones1.inc (pigment in T_Grnt17a with 
slight modifications).
The original render had far more less dynamic in colors. I raised it with before 
posting it in order to see more details.

> Real cobblestones are somewhat rounded and used to bear traffic.
> Originally they were derived from local river stone.
> e.g.
> http://www.pmb.ox.ac.uk/images/tour/TourOutside1.jpg
> They age/wear to become smoothe and shiny. See e.g.
> http://www.miksang.net/galleries/gal_waynewilliams/pages/Dublin-Cobble-Stone.html
> For a description of distinctions between cobbled other forms of flint stone
> paving see
> http://www.jbsv.co.uk/norfolkflint.htm

wow, thanks for the references. Gives me good point where to start, even when 
the Dublin reference seems to be basalt (nearly homogeneous black) instead of 
granite.
It happend that I saw some worker's building a cobblestone sideway. Of cause 
they used freshly broken stones. This was probably the main influence I had in 
mind  as I searched for the right look.

I have to play with the parameters of the rigged_mf function to get this 
polished look on top and a little more grainish look inside the ditches.

I'm not sure if a supperellispoid is the appropiate base shape for a "pillowed" 
cube. Maybe I've to blob a sphere with superellispoid or so.

... dave

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aaglo wrote:
> I think the overall shape of the stones is great, but the finishing could be
> a bit better. I think that the stones would be more polished after being
> used a bit. Making them a bit smoother and shinier should do the trick.

yepp, you're right. Finish still needs work (especialy if it comes to be a 
slightly wet look)

... dave

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