POV-Ray : Newsgroups : povray.binaries.images : colored leaves Server Time: 21 Jul 2018 11:08:42 GMT
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From: Norbert Kern
Subject: colored leaves
Date: 15 Mar 2012 19:30:00
Message: <web.4f624250b5209546dc4ffc880@news.povray.org>
Hi,

i want to share a nice trick.
One of the disadvantages of tree modelers using imagemap based leaf textures is
the uniformity of the foliage.
On the other hand the first leaves getting colored in autumn are the outer ones.
So the task was to get an existing mesh recolored based on a pattern like onion
or projection (mlpov or megapov).
Using a texture_pattern was awfully slow, so I decided to find a way to save the
color information.
So I used an old Poseray version, which opens mesh2 files and is able to save in
the old mesh formate (Poseray 3.8.7).
Then I read the first triangle coordinate and saved the color value derived by
the projection pattern in a different file. After some copy and paste I had a
mesh with three different imagemap based leaf textures (red, yellow and green).

As a demonstration file I used a nice backlit scene inspired by a romantic
painting I found on the web long time ago.
Only the two big trees use the projection pattern trick.


Norbert Kern


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From: Norbert Kern
Subject: Re: colored leaves
Date: 15 Mar 2012 19:35:04
Message: <web.4f6243b5985f1ee4dc4ffc880@news.povray.org>
hmm, here is the image...


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Attachments:
Download 'colored_trees.jpg' (369 KB)

Preview of image 'colored_trees.jpg'
colored_trees.jpg


 

From: clipka
Subject: Re: colored leaves
Date: 15 Mar 2012 19:48:22
Message: <4f624786$1@news.povray.org>
Am 15.03.2012 20:32, schrieb Norbert Kern:
> hmm, here is the image...

Nice one; what did you use to make this picture - acrylic or oil colors? :-D

Honestly, this is fantastic.


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From: BertvdB
Subject: Re: colored leaves
Date: 15 Mar 2012 20:15:01
Message: <web.4f624d37985f1ee4d25d21bf0@news.povray.org>
clipka <ano### [at] anonymousorg> wrote:
> Am 15.03.2012 20:32, schrieb Norbert Kern:
> > hmm, here is the image...
>
> Nice one; what did you use to make this picture - acrylic or oil colors? :-D
>
> Honestly, this is fantastic.

Hm, seems to be povray
fantastic


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From: Thomas de Groot
Subject: Re: colored leaves
Date: 16 Mar 2012 07:59:03
Message: <4f62f2c7$1@news.povray.org>
Excellent technique and very beautiful image indeed!

On 15-3-2012 20:29, Norbert Kern wrote:
> Hi,
>
> i want to share a nice trick.
> [snip]
> So I used an old Poseray version, which opens mesh2 files and is able to save in
> the old mesh formate (Poseray 3.8.7).

Ah this is nice! Might be a good reason to ask FlyerX to add a 
mesh/mesh2 save option, with mesh2 as default.

> Then I read the first triangle coordinate and saved the color value derived by
> the projection pattern in a different file. After some copy and paste I had a
> mesh with three different imagemap based leaf textures (red, yellow and green).

I am not entirely sure how you did this but the result is spectacular 
and convincing.
>
> As a demonstration file I used a nice backlit scene inspired by a romantic
> painting I found on the web long time ago.
> Only the two big trees use the projection pattern trick.


Thomas


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From: Paolo Gibellini
Subject: Re: colored leaves
Date: 16 Mar 2012 08:33:03
Message: <4f62fabf@news.povray.org>
> Only the two big trees use the projection pattern trick.
>
>
> Norbert Kern
>
Impressive.
Paolo


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From: Norbert Kern
Subject: Re: colored leaves
Date: 18 Mar 2012 09:00:01
Message: <web.4f65a3c1985f1ee41dab3f8c0@news.povray.org>
clipka <ano### [at] anonymousorg> wrote:

> Nice one; what did you use to make this picture - acrylic or oil colors? :-D
>
> Honestly, this is fantastic.

thank you very much!


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From: Norbert Kern
Subject: Re: colored leaves
Date: 18 Mar 2012 09:00:03
Message: <web.4f65a3eb985f1ee41dab3f8c0@news.povray.org>
"BertvdB" <ber### [at] kpnmailnl> wrote:

> Hm, seems to be povray
> fantastic


Thanx!!


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From: Norbert Kern
Subject: Re: colored leaves
Date: 18 Mar 2012 09:10:01
Message: <web.4f65a5fb985f1ee41dab3f8c0@news.povray.org>
Thomas de Groot <tho### [at] degrootorg> wrote:

> I am not entirely sure how you did this but the result is spectacular
> and convincing.

I will add a simple demonstration file to povray.binaries.scene-files, where the
several steps are shown.
As you can see, saving a mesh saves a lot of render time, but there is a
disatvantage too - sharp leaf texture changes can happen within one leaf.

Of course this trick can be useful for several kinds of slow textures applied to
a mesh...


Norbert


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Attachments:
Download 'projection pattern trick.jpg' (142 KB)

Preview of image 'projection pattern trick.jpg'
projection pattern trick.jpg


 

From: Norbert Kern
Subject: Re: colored leaves
Date: 18 Mar 2012 09:10:02
Message: <web.4f65a627985f1ee41dab3f8c0@news.povray.org>
Paolo Gibellini <p.g### [at] gmailcom> wrote:

> Impressive.
> Paolo

thank you very much!


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