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From: Sigmund Kyrre Aas
Subject: Eroded finish
Date: 1 Feb 2000 16:28:19
Message: <38974E9C.5FDC881E@stud.ntnu.no>
Have anyone though of adding a weathered surface capability to pov?
According to the February issue of Scientific American, this is the
recipe to make ultra-realistic ray-traced images.

http://graphics.lcs.mit.edu/materials

sig.


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From: cadman
Subject: Re: Eroded finish
Date: 1 Feb 2000 20:13:44
Message: <389784c8@news.povray.org>
YES YES YES!! That would make light-years of difference in realism.  I am
curious to see where this goes.

Sigmund Kyrre Aas <as### [at] studntnuno> wrote in message
news:38974E9C.5FDC881E@stud.ntnu.no...
> Have anyone though of adding a weathered surface capability to pov?
> According to the February issue of Scientific American, this is the
> recipe to make ultra-realistic ray-traced images.
>
> http://graphics.lcs.mit.edu/materials
>
> sig.
>


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From: TonyB
Subject: Re: Eroded finish
Date: 1 Feb 2000 20:24:02
Message: <38978732@news.povray.org>
>Have anyone though of adding a weathered surface capability to pov?
>According to the February issue of Scientific American, this is the
>recipe to make ultra-realistic ray-traced images.
>
>http://graphics.lcs.mit.edu/materials


Not this again! I though we had already talked about this. I believe you
guys concluded that it couldn't be done. Right?


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From: Chris Huff
Subject: Re: Eroded finish
Date: 1 Feb 2000 20:31:53
Message: <chrishuff_99-0017AE.20324201022000@news.povray.org>
In article <38978732@news.povray.org>, "TonyB" 
<ben### [at] panamac-comnet> wrote:

> Not this again! I though we had already talked about this. I believe you
> guys concluded that it couldn't be done. Right?

It can be done. All you have to do is use the right combination of 
texture maps and layered textures. You don't even need a patch.

Of course, a patch that gives a new pattern which varies depending on 
the curvature of the surface of an object would be very useful for this 
kind of thing. I have tried to do this, but without success, and I 
haven't done any work on it lately.(although I have a couple ideas that 
I would like to try out)

-- 
Chris Huff
e-mail: chr### [at] yahoocom
Web page: http://chrishuff.dhs.org/


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From: Lance Birch
Subject: Re: Eroded finish
Date: 2 Feb 2000 00:25:07
Message: <3897bfb3@news.povray.org>
Anistrophics (I think that's the right spelling).

Also if you want a make a nice eroded surface, the key is changing the
shininess strength in key with the amount of erosion at a particular point.
(image maps are quite useful with this, you can use the inverse brightness
of the original map as an applied map to the shininess of the surface)

--
Lance.
The Zone - http://come.to/the.zone


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From: Peter Warren
Subject: Re: Eroded finish
Date: 2 Feb 2000 03:25:46
Message: <3897ea0a@news.povray.org>
sig.

Thanks for pointing this out.
I haven't seen this months SA.
Good link.

Peter


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From: Fabian Brau
Subject: Re: Eroded finish
Date: 2 Feb 2000 03:45:11
Message: <3897EF69.BDED5ADE@umh.ac.be>
You are right a combination of texture_map (or even better and 
more accurate: material_map, like this you can place the erosion where 
you want) and layered texture do the job! A new pattern which can do
this 
automatically could be, in fact, difficult to use no?

Fabian.

Chris Huff wrote:
> 
> In article <38978732@news.povray.org>, "TonyB"
> <ben### [at] panamac-comnet> wrote:
> 
> > Not this again! I though we had already talked about this. I believe you
> > guys concluded that it couldn't be done. Right?
> 
> It can be done. All you have to do is use the right combination of
> texture maps and layered textures. You don't even need a patch.
> 
> Of course, a patch that gives a new pattern which varies depending on
> the curvature of the surface of an object would be very useful for this
> kind of thing. I have tried to do this, but without success, and I
> haven't done any work on it lately.(although I have a couple ideas that
> I would like to try out)
> 
> --
> Chris Huff
> e-mail: chr### [at] yahoocom
> Web page: http://chrishuff.dhs.org/


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From:
Subject: Re: Eroded finish
Date: 2 Feb 2000 05:34:53
Message: <k8e9013uc34.fsf@jeeves.stud.ntnu.no>
Fabian Brau <fab### [at] umhacbe> writes:

> You are right a combination of texture_map (or even better and 
> more accurate: material_map, like this you can place the erosion where 

Yes, we have all those. The point was to use an algorithm which places the
erosion automatically. For instance by simulating where raindrops would 
fall on a marble statue. 
(I esp. liked that one: http://graphics.lcs.mit.edu/~hkp/OldPicts/venus.tif)

-- 
Sigmund Kyrre Aas


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From: Ken
Subject: Re: Eroded finish
Date: 2 Feb 2000 05:45:22
Message: <38980ABA.13375A79@pacbell.net>

> 
> Fabian Brau <fab### [at] umhacbe> writes:
> 
> > You are right a combination of texture_map (or even better and
> > more accurate: material_map, like this you can place the erosion where
> 
> Yes, we have all those. The point was to use an algorithm which places the
> erosion automatically. For instance by simulating where raindrops would
> fall on a marble statue.
> (I esp. liked that one: http://graphics.lcs.mit.edu/~hkp/OldPicts/venus.tif)
> 
> --
> Sigmund Kyrre Aas

As Ron mentioned I brought this up a couple of months ago in the unofficial
patches group. An excellent paper on patina's can be found at -

http://graphics.lcs.mit.edu/~dorsey/papers/patina/

-- 
Ken Tyler -  1300+ Povray, Graphics, 3D Rendering, and Raytracing Links:
http://home.pacbell.net/tylereng/index.html http://www.povray.org/links/


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From: Ron Parker
Subject: Re: Eroded finish
Date: 2 Feb 2000 08:32:42
Message: <slrn89gcgn.v8.ron.parker@ron.gwmicro.com>
On Wed, 02 Feb 2000 02:45:14 -0800, Ken wrote:
>As Ron mentioned I brought this up a couple of months ago in the unofficial
>patches group. An excellent paper on patina's can be found at -
>
>http://graphics.lcs.mit.edu/~dorsey/papers/patina/

I didn't say anything!  But we did discuss it a while ago...

Oh, and that paper is linked from the page Sigmund mentioned.  So
are three other papers on similar topics.

-- 
These are my opinions.  I do NOT speak for the POV-Team.
The superpatch: http://www2.fwi.com/~parkerr/superpatch/
My other stuff: http://www2.fwi.com/~parkerr/traces.html


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