Xplo Eristotle <inq### [at] unforgettablecom> wrote in message
news:3983B7DD.7B52B225@unforgettable.com...
>
>
> "Chris S." wrote:
> >
> > Similar scene from my previous post with isosurface boulders.
> > Comments/suggestions welcome.
>
> Very convincing rocks! But those bubbles gotta go...
>
> -Xplo

Wow, my bubbles are really getting trashed!  However, I agree with previous
comments that they should be whiter and more organically shaped...but
therein lies the problem.  The bubbles themselves are clear and would be
invisible if not for a .25 reflective finish.  I suppose I could try a blob
macro on the bubbles, but common, get rid of the bubbles!?...how can you say
no to bubbles;)

-Chris-

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Christoph Hormann <Chr### [at] schunteretctu-bsde> wrote in message
news:3983CBBE.C4240AFD@schunter.etc.tu-bs.de...
> Looks great, very realistic.  What pattern do you use for the roughtness
of the
> surface ? Is it only noise3d or some pigment ?

Thanks.  The texture is a rather simple bozo with a highly turbulence
normal.  The rock itself is a bloby isosurface eaten away by a "big"
noise3d, creating basic shape, and a "small" noise3d, giving the rock pits
and bumbs.

> There are two light and flat parts in the dark areas on the right, one not
much
> visible on the left, not sure what it is, but it looks somewhat wrong.

That's an area where the rock has been completely eaten through by the
noise3d, so you're able to see another rock, which has become more faded due
to fog.

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In article <3984314f$1@news.povray.org>, "Chris S." 
<chr### [at] bluelectrodecom> wrote:

> Wow, my bubbles are really getting trashed!  However, I agree with 
> previous comments that they should be whiter and more organically 
> shaped...but therein lies the problem.  The bubbles themselves are 
> clear and would be invisible if not for a .25 reflective finish. 

Ah, here is one problem. Use angle-dependant reflection, some 
refraction(ior 0.67? Or just ior 1, and difference the bubbles away from 
your water object, which should be around ior 1.33), and very small 
specular highlights.


> I suppose I could try a blob macro on the bubbles,

For the largest bubbles a blob macro would help, but for the 
medium-sized ones, an asymmetrically scaled sphere would work. To do 
this, just sandwich together a hemisphere and a sphere with different 
scales, and use merge to remove the interior surfaces. Something like 
this:

merge {
    difference {
        sphere {< 0, 0, 0>, 1}
        plane {y, 0}
    }
    sphere {< 0, 0, 0>, 1 scale < 1, 0.5, 1>}
} 

Or you should be able to get some interesting isosurface bubbles...

-- 
Christopher James Huff - Personal e-mail: chr### [at] maccom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://homepage.mac.com/chrishuff/
TAG Web page: http://tag.povray.org/

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"Chris S." <chr### [at] bluelectrodecom> wrote :
>
> Wow, my bubbles are really getting trashed!

    This group is  known for our unreasoned hatred for bubbles.

> However, I agree with previous
> comments that they should be whiter and more organically shaped...but
> therein lies the problem.  The bubbles themselves are clear and would be
> invisible if not for a .25 reflective finish.  I suppose I could try a
blob
> macro on the bubbles, but common, get rid of the bubbles!?...how can you
say
> no to bubbles;)

    I would go with blobs and interior, making the ior of the bubbles less
than the ior of the water. You want refraction, not reflection.

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