"Bald Eagle" <cre### [at] netscapenet> wrote:
> "Thomas Fester" <tfe### [at] scivitde> wrote:
>
> > Isn't it weird for how long we are doing this? (But each one of us is also doing
> > other things, thanks god...)
>
> Indeed, and we have all learned so much along the way, and met so many
> interesting and creative people.
>
> > I have to reflect about your alternative propositions for leaf construction, but
> > currently I am trying to adapt my method to a maple leaf. (Pretty difficult)
>
> I think that you will come up with something workable.
>
> > One thing the blob approach does not do (as far as I know) is different textures
> > on the upper and lower side of the leaf. That's a pity since most leaves do have
> > different textures on their the upper and lower side...
>
> Well, you can always try to make a difference {} of the main leaf and a "cutter"
> leaf to subtract away a thin layer from the bottom of the leaf - and the
> subtracted surface will have the texture of the "cutter".
>
> If you're still looking for a way to "sculpt" your shape so that it's not a
> mathematically flat plane, then take a look at the old "Object Bender" by Chris
> Colefax.
>
> Also, Chris R does almost everything with isosurfaces, and he might have some
> advice about making an isosurface leaf, which you could then properly bend an
> object, like so:
>
>
https://news.povray.org/povray.binaries.images/thread/%3Cweb.5d4b7ce3a683fa3a4eec112d0%40news.povray.org%3E/
>
> - BW

This was my most recent scene creating leaves from isosurfaces:
https://news.povray.org/povray.binaries.images/thread/%3Cweb.6669faf39aa7eb7453fb81ab5cc1b6e%40news.povray.org%3E/

For these, I found an interesting 2-D polar function to start with and started
playing with it to get the edges I wanted.  It's pretty easy to extrude that in
along the Y axis to get whatever thickness you want, and you can apply different
textural deformations to the top side and bottom side of the shape.  Then you
can transform the Y coordinate to get the 3-D curves from the flat shape.

Getting a different texture on the bottom and top of the leaf is a little
trickier, but can be done by splitting the leaf shape function in half and
applying a different texture on each half.

-- Chris R

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