Strange, I was working on a blob-text macro at the w.e. and two pop up in
this ng. Anyway, got sidetracked by an alternative use - blob snow on a hf.
To some extent the macro mimics TRACE type 2, in that height and normal of
underlying hf is a factor. The main problem at the moment is trying to
remove all traces of regularity from the blob placement.

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Attachments:
Download 'testmounts.jpg' (17 KB)

Preview of image 'testmounts.jpg'

This has real possibilities - trace type 2? I missed that one - have to look
it up. perhaps scaling the blobs flatter would help with realism.

I think that handling randomness in pov is really difficult to control -
IMHO it's an area that could be improved.

--
*************************************************************
       http://www.mhazelgrove.fsnet.co.uk/index.hml

*************************************************************
"Tom Melly" <tom### [at] tomandluforce9couk> wrote in message
news:38d7b086$1@news.povray.org...
> Strange, I was working on a blob-text macro at the w.e. and two pop up in
> this ng. Anyway, got sidetracked by an alternative use - blob snow on a
hf.
> To some extent the macro mimics TRACE type 2, in that height and normal of
> underlying hf is a factor. The main problem at the moment is trying to
> remove all traces of regularity from the blob placement.
>
>
>

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Mick Hazelgrove <mha### [at] mindaswinternetcouk> wrote in message
news:38d7c68e@news.povray.org...
> This has real possibilities - trace type 2? I missed that one - have to
look
> it up. perhaps scaling the blobs flatter would help with realism.
>

Sorry, meant to say "slope type 2", not trace. Yes, tried scaling the blobs
flatter, but I think it made them overhang in a weird way. I'll try it
again, though, as I've added some new parameters I can play with since then.

I've posted the code in text.scene-files if you want to take a look. (not
the tga - if anyone wants it, mail me).
--
Tom Melly
tom### [at] tomandluforce9couk
http://www.tomandlu.force9.co.uk

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Tom Melly wrote:

>The main problem at the moment is trying to
>remove all traces of regularity from the blob placement.

You could try declare a pigment and use eval_pattern or eval_pigment. Put 
it in inside your trace loop. If the value of eval_pattern is higher than a 
given value trace the point, if not go to the next point.

Ingo

-- 
Photography: http://members.home.nl/ingoogni/
Pov-Ray    : http://members.home.nl/seed7/

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> Sorry, meant to say "slope type 2", not trace. Yes, tried scaling the blobs
> flatter, but I think it made them overhang in a weird way.

Scale them flatter but also rotate them to the normal of the slope.  This should
fix any problems.


--
H.E. Day

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H.E. Day <hed### [at] fcinet> wrote in message news:38D80551.3BD86960@fci.net...
> > Sorry, meant to say "slope type 2", not trace. Yes, tried scaling the
blobs
> > flatter, but I think it made them overhang in a weird way.
>
> Scale them flatter but also rotate them to the normal of the slope.  This
should
> fix any problems.
>
>

Tried that - failed miserably to work out how to do it - I have a normal,
how do I translate it into a rotation? Many thanks in anticipation.

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Tom Melly wrote in message <38d81927@news.povray.org>...
>H.E. Day <hed### [at] fcinet> wrote in message news:38D80551.3BD86960@fci.net...
>>
>> Scale them flatter but also rotate them to the normal of the slope.  This
>should
>> fix any problems.
>
>Tried that - failed miserably to work out how to do it - I have a normal,
>how do I translate it into a rotation? Many thanks in anticipation.


Try using the 'reorient' macro on the normal vector and the 'y' vector to
get the transform you need.

Mark

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looks like a moutain of golf balls

Rick

"Tom Melly" <tom### [at] tomandluforce9couk> wrote in message
news:38d7b086$1@news.povray.org...
> Strange, I was working on a blob-text macro at the w.e. and two pop up in
> this ng. Anyway, got sidetracked by an alternative use - blob snow on a
hf.
> To some extent the macro mimics TRACE type 2, in that height and normal of
> underlying hf is a factor. The main problem at the moment is trying to
> remove all traces of regularity from the blob placement.
>
>
>

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Yeh, those japanese golf courses are a bitch...

Rick [Kitty5] <pov### [at] dialpipexcom> wrote in message
news:38d88e2e@news.povray.org...
> looks like a moutain of golf balls
>
> Rick
>

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Mick Hazelgrove wrote:

> I think that handling randomness in pov is really difficult to control -
> IMHO it's an area that could be improved.

This is has become much better with megapov.  You can try vturbulence() or, for
more control, eval_pigment() or eval_pattern(). All these functions may provide
"intelligent" randomness, i.e. randomness who knows where it is and what it
does.

G.

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