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

Post a reply to this message

hmm, here is the image...

Post a reply to this message

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

Preview of image 'colored_trees.jpg'

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.

Post a reply to this message

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

Post a reply to this message

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

Post a reply to this message

> Only the two big trees use the projection pattern trick.
>
>
> Norbert Kern
>
Impressive.
Paolo

Post a reply to this message

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!

Post a reply to this message

"BertvdB" <ber### [at] kpnmailnl> wrote:

> Hm, seems to be povray
> fantastic


Thanx!!

Post a reply to this message

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

Post a reply to this message

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

Preview of image 'projection pattern trick.jpg'

Paolo Gibellini <p.g### [at] gmailcom> wrote:

> Impressive.
> Paolo

thank you very much!

Post a reply to this message