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From: Thomas de Groot
Subject: Experiment in weathering #1 [~312kB]
Date: 24 Feb 2008 09:47:18
Message: <47c18376@news.povray.org>
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This looks like a severely weathered column. However, weathering was applied
to the individual segments instead of the complete column. As a result, it
seems to be built up of randomly choosen fragments from already weathered
columns. A second-hand column as it were.
I am going to see if I can get the first-hand one now...
Thomas
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Attachments:
Download 'WeatheredColumn_test.png' (313 KB)
Preview of image 'WeatheredColumn_test.png'
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Thomas de Groot nous apporta ses lumieres en ce 2008/02/24 09:47:
> This looks like a severely weathered column. However, weathering was applied
> to the individual segments instead of the complete column. As a result, it
> seems to be built up of randomly choosen fragments from already weathered
> columns. A second-hand column as it were.
>
> I am going to see if I can get the first-hand one now...
>
> Thomas
>
>
>
As real columns are made from discreete pieces, and that those are not from
adjacent parts of the same rock, maybe not even from the same quary, the
weatering is often not concistent.
A strong spot in one piece may be next to a weak spot in it's neibour. So, I see
no problem in having disparate weathering patterns from one stone to the next.
--
Alain
-------------------------------------------------
EVERYTHING HAS A GENDER
You may not know this but many nonliving things have a gender...
A Web Page is Female, because it's always getting hit on.
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"Alain" <ele### [at] netscape net> schreef in bericht
news:47c1afdc$1@news.povray.org...
>>
> As real columns are made from discreete pieces, and that those are not
> from adjacent parts of the same rock, maybe not even from the same quary,
> the weatering is often not concistent.
> A strong spot in one piece may be next to a weak spot in it's neibour. So,
> I see no problem in having disparate weathering patterns from one stone to
> the next.
>
That is only partly true, imo. Generally builders will take painstaking care
to get stones from the same quarry and - if possible - even from the same
spot, in order to keep unity in the building, except when it is intended to
be covered by a mantle or a curtain wall.
While it is true that the structure of the rock is not uniform, weathering
generally radiates from weak points like seams and works its way on both
sides. In the end, you are left with an (assymetrical) zone of eroded
stones, which nonetheless show that they belong together in the first place.
My example, of course, is a really extreme case of weathering, but still I
think that weathering should be shown to radiate from discrete points of
weakness.
Thomas
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From: Jim Charter
Subject: Re: Experiment in weathering #1 [~312kB]
Date: 27 Feb 2008 03:31:08
Message: <47c51fcc@news.povray.org>
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Thomas de Groot wrote:
> This looks like a severely weathered column. However, weathering was applied
> to the individual segments instead of the complete column. As a result, it
> seems to be built up of randomly choosen fragments from already weathered
> columns. A second-hand column as it were.
>
> I am going to see if I can get the first-hand one now...
>
> Thomas
>
>
>
Thomas, I can't keep my hands off your project! :(
Post a reply to this message
Attachments:
Download '0039.jpg' (134 KB)
Preview of image '0039.jpg'
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From: Thomas de Groot
Subject: Re: Experiment in weathering #1 [~312kB]
Date: 27 Feb 2008 03:48:11
Message: <47c523cb@news.povray.org>
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"Jim Charter" <jrc### [at] msncom> schreef in bericht
news:47c51fcc@news.povray.org...
>>
> Thomas, I can't keep my hands off your project! :(
>
You are welcome to it, by all means!
This is looking very good. I need a bit more time for an isosurface column
shaft properly weathered. However, it is quite slow so it won't be very
useful for large numbers in a scene I am afraid. Still, I'll post it in due
time.
Thomas
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Thomas de Groot wrote:
> "Jim Charter" <jrc### [at] msncom> schreef in bericht
> news:47c51fcc@news.povray.org...
>
>>Thomas, I can't keep my hands off your project! :(
>>
>
>
> You are welcome to it, by all means!
>
> This is looking very good. I need a bit more time for an isosurface column
> shaft properly weathered. However, it is quite slow so it won't be very
> useful for large numbers in a scene I am afraid.
Whatever it takes.
These are intersected mesh models which are also slow. You may recall
when I was working with fluted columns a while back and someone here
helped me with some code for it using sphere sweeps. I just that method
only to discover that it is also very slow, even before converting it to
isosurfaces.
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