POV-Ray : Newsgroups : povray.general : POV-Tree 1.5 Server Time
23 Apr 2024 17:19:27 EDT (-0400)
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From: Gena
Subject: Re: POV-Tree 1.5
Date: 10 May 2004 01:22:33
Message: <409f1199@news.povray.org>
You can simulate this by playing with twig parameters
on 'Additional' tab (Angle, Alignment...).
The last twig on the branch will start right at
the end of the branch with angle which you define.
If you need 2" or 3" inches below the chop point
you have to move that last twig manually in
'Edit Mesh' mode.

There are so many different features in the nature
that I'm afraid it's almost impossible to simulate
all of them automatically :( Among others:

- many trees have some dry branches which usually
   have different color and don't have leaves. You can
   simulate it combining parts without leaves with
   parts which have foliage.

- multi-trunk trees. Such trees are not supported
   in POV-Tree. You can only simulate it either
   defining branches as trunks or combining several
   trees.

- roots usually have the same "tree" structure. In
   POV-Tree roots have only first order elements.
   If you need tree-like roots you have to make a
   separate tree model for the root and then rotate
   it around Z or X axis.

Here is another stuff not supported in POV-Tree but
which can probably will have direct support in the
future:

- fruits/berries (right now you can simulate it through
   custom mesh blossom)
- birds' nests
- geometrically lopped trees - cones, cylinders etc.
   (this feature is available in some commercial
   packages)

Gena.



stephen parkinson wrote:
> Gena wrote:
> 
>> Final version of POV-Tree 1.5 is available here:
>>
>> http://home.covad.net/~gobukhov/povtree.html
>>
>> You can also find there screenshots:
>>
>> http://home.covad.net/~gobukhov/screenshots.html
>>
>> and small tutorial 'Making Leaves':
>>
>> http://home.covad.net/~gobukhov/tutorial.html
>>
>> Please let me know if you will find out any
>> problem.
>>
>> Gena.
>>
> 
> any ideas how to do a tree that have grown to have branches budding from 
> where its been lopped/trimmed
> 
> say trunk 12", main branches 6" and some stuff has been lopped
> back to say 3"
> after a few years it springs 2" or 3" branches from just below the chop
> point
> 
> cherry tree seem to be a favourite target for some reason
> 
> stephen


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From: cubicon
Subject: Re: POV-Tree 1.5
Date: 10 May 2004 18:35:01
Message: <web.40a002aedd441b42a7b9d5440@news.povray.org>
I think that technically, the program is very good.
The reason the images doesn't look 100% realistic,
or perhaps I should say naturalistic is, apart from
what has already been mentioned, the fact that the
growth of real trees are controlled by nature.
Ie where it stands (winds & soil) and the access to
light and water.

The most important factor would be light and water.
The water controls how much the branches grow, and
light controls how they grow.
So what is missing is the "distortion" of the algoritm
that occurs when the branches turns to take advantage
of the light.
Thus the scrambling isn't random, but depend on other
branches, direction of light etc.
That is why the mesh editor is so important, because
it enables you to remove the branches that "looks"
wrong.
Perhaps this problem could be solved by a growth
simulation, coupled with an attractor (representing
the light).
I'm not trying to criticize the program or anything,
it just thought it would be an interesting topic.


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From: Thomas de Groot
Subject: Re: POV-Tree 1.5
Date: 11 May 2004 02:55:37
Message: <40a078e9@news.povray.org>
"stephen parkinson" <ste### [at] zmemw16demoncouk> schreef in bericht
news:409e4403$1@news.povray.org...

> any ideas how to do a tree that have grown to have branches budding from
> where its been lopped/trimmed
>
> say trunk 12", main branches 6" and some stuff has been lopped
> back to say 3"
> after a few years it springs 2" or 3" branches from just below the chop
> point
>
> cherry tree seem to be a favourite target for some reason
>

I did this with splinetree.inc by Andrew Clinton. However, that is no answer
to doing it with POV-Tree, of course.

Thomas


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