In between projects, time to experiment with a couple of things.

In March 2012, Norbert Kern explained how to make believable fall trees:

http://news.povray.org/povray.binaries.images/thread/%3Cweb.4f624250b5209546dc4ffc880@news.povray.org%3E/

Not using megapov, I took some of his suggestions and worked instead on 
POVtree meshes, using a spherical texture to simulate the fall colours. 
The present image (in my tree testing environment) is a credible result 
I guess.

The use of this texture needs some careful tweaking in terms of scale 
and translation, and also a strong warp turbulence to make a more random 
distribution.

The following code is used, with the POVtree terminology:

//start code
#declare LAUB =
texture {
   spherical
   texture_map {
     [0.45 BOZO1]
     [0.55 BOZO2]
   }
   scale 1015.11115	//scale according to POVtree output
   scale 1/50
   warp {turbulence 10}	//change according to need
   scale 50
   scale <0.5, 1, 0.5>*1	//change according to need
   translate 250.0*y	//change according to need and/or POVtree scale above
}
//end code

Thomas

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Attachments:
Download 'povtree_test.png' (206 KB)

Preview of image 'povtree_test.png'

Wonderful work. My first idea of a slight improvement is to have some yellowish
leafs between the green and the brown ones, since most green leafs are turning
yellow before turning red or brown. But this remark should not belittle your
approach, it's wonderful. During my daily travels by train to work and back I
had to pass some woods and pondered this issue again and again and ever thought
to break down the arbaro meshes in leaf groups to achieve this. Your approach is
much more simple and seems to work fine.

Best regards,

Michael

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On 8-12-2012 18:06, MichaelJF wrote:
> Wonderful work. My first idea of a slight improvement is to have some yellowish
> leafs between the green and the brown ones, since most green leafs are turning
> yellow before turning red or brown. But this remark should not belittle your
> approach, it's wonderful. During my daily travels by train to work and back I
> had to pass some woods and pondered this issue again and again and ever thought
> to break down the arbaro meshes in leaf groups to achieve this. Your approach is
> much more simple and seems to work fine.
>

Thanks Michael! Yellow leaves should not be too difficult in the present 
configuration: just an intermediate pigment between green and red, and 
some more tweaking on the texture_map. I have only explored a little of 
the uv-mapping part of POVtree and that is where I want to try this 
technique out too, one way or another. For instanc,e I was thinking 
about layering the colours over the leaf image_maps, although that might 
give unexpected results.

I am not too familiar with arbaro although it is gathering dust 
somewhere on my HD ;-) For each application the approach might be different.

Thomas

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On 8-12-2012 18:06, MichaelJF wrote:
> Wonderful work. My first idea of a slight improvement is to have some yellowish
> leafs between the green and the brown ones, since most green leafs are turning
> yellow before turning red or brown.

Something like this.

Thomas

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Attachments:
Download 'povtree_test.png' (206 KB)

Preview of image 'povtree_test.png'

Thomas de Groot <tho### [at] degrootorg> wrote:
> On 8-12-2012 18:06, MichaelJF wrote:
> > Wonderful work. My first idea of a slight improvement is to have some yellowish
> > leafs between the green and the brown ones, since most green leafs are turning
> > yellow before turning red or brown.
>
> Something like this.
>
> Thomas

Sorry for answering a little bit late, but I'm heavily occupied by RL issues at
the moment (and will be till the end of the year - as every year). Yes,
something like this (to cite Kevin Kline in "A Fish called Wanda"). It's fine. I
hope to find time next year to have some experiments with this
scaling-turbulence trick.

Best regards,
Michael

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On 10-12-2012 22:48, MichaelJF wrote:
> Sorry for answering a little bit late, but I'm heavily occupied by RL issues at
> the moment (and will be till the end of the year - as every year). Yes,
> something like this (to cite Kevin Kline in "A Fish called Wanda"). It's fine. I
> hope to find time next year to have some experiments with this
> scaling-turbulence trick.

That's all right. I have continued my investigations a bit:

Problem: POVtree does not export to mesh{} with uv-mapped leaves. There 
is a bug in the program. A pity Gena disappeared from the web. :-( so my 
idea to experiment with that comes to naught.

I am looking into Arbaro right now.

Thomas

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Thomas de Groot <tho### [at] degrootorg> wrote:
> On 8-12-2012 18:06, MichaelJF wrote:
> > Wonderful work. My first idea of a slight improvement is to have some yellowish
leafs between the green and the bro
wn ones, since most green leafs are turning yellow before turning red or brown.
>

A wunderful approach to use the trick (not easy in reality).

further, otherwise it would've ended like so much other trials and errors...

Good luck for you,
Norbert

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> A wunderful approach to use the trick (not easy in reality).

> further, otherwise it would've ended like so much other trials and errors...

 her the image...

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Attachments:
Download 'early wip.jpg' (350 KB)

Preview of image 'early wip.jpg'

On 12-12-2012 21:22, Norbert Kern wrote:
>
>> A wunderful approach to use the trick (not easy in reality).

>> further, otherwise it would've ended like so much other trials and errors...
>
>   her the image...
>

Yes, this is looking quite perfect to me.

I have not yet found a good way (for me) to tackle the uv-mapped 
image_map leaves.I am investigating.

Thomas

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"Norbert Kern" <nor### [at] t-onlinede> wrote:
> > A wunderful approach to use the trick (not easy in reality).

> > further, otherwise it would've ended like so much other trials and errors...
>
>  her the image...

These are nice.  They're making me nostalgic for my years in New England.

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