Thomas de Groot <tho### [at] degrootorg> wrote:
> On 29-9-2016 21:25, SecondCup wrote:
> > Hi,
> >
> > I'm wondering if there is a way to treat a mesh2 as an isosurface. I'm pretty
> > new to pov-ray (some will notice my regular contribution to the 'newusers'
> > forum) so still figuring out a lot of the stuff. This one might be straight
> > forward.
>
> As far as I know: no.
>
> >
> > I have a mesh2 file of something that looks like a few pancakes layered on top
> > of one another. This was created using Accutrans that converted my
> > wireframe/solid/whatever-ya-wanna-call-it.dxf into a .pov file (version 3.5).
> > I want to make these pancake type surfaces look like they are stone, or a
> > roughly chiseled piece of rock.
> >
> > Looking around online, I found an excellent rendering of a sandstone by PM 2Ring
> > on this site. The wrinkly patterns and depth of the bumps are perfect for what I
> > am looking for. Is it possible to make my pancake-type-thingy.pov have the same
> > texture as the sandstone in PM 2Ring's code?
>
> Yes. Although the pancakes are very smooth, to get a stone-like effect
> you need to add a normal to the texture and play with scale and rotation
> to get the effect you desire.
>
> The isosurface PM2Ring is using is sufficiently rough by itself to just
> use the texture without a normal. The pancakes on the other hand are too
> smooth and you have to adapt to get a similar effect. Note that my
> example is only one of many. You should play with all the possibilities
> offered by POV-Ray to get what you want.
>
> One thing I would like to suggest, if you want to go along with these
> pancakes, is to try and use 'Subdivision' and then 'Displacement' in
> Poseray. That way you would make the pancakes much more interesting.
>
> >
> > He uses functions and isosurfaces that I'm still trying to get my head around,
> > is there someone out there who can tell me if they are mergeable?
>
> As said above, no.
>
> >
> > Attached are both codes...You'll notice I have been able to incorporate the
> > colours into my file.
> >
>
> I re-attach the file with a couple of additions/corrections. Switch off
> most of the fill-in lights. Set to version 3.7 and standard assumed_gamma 1.
>
> --
> Thomas

Thank you for the advice Thomas, it's really appreciated.

I scaled it to 500 and added some turbulence. It looks pretty good. Now to fine
tune the lighting :)

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