Well this particular Bamboo will be in a close-up shot so i need the
detail.

Rob.

Steve schreef:

> On Sun, 10 Dec 2000 12:12:37 +0100, Rob Verweij wrote:
>
> >Here's my fiirst bamboo-texture test. Any comments/suggestions?
>
> ...The only reservation I'd have about using such a texture is
> that at a distance you probably won't see any of that intricate
> detail, but you'd suffer the render time that'd go with it.
>
> Keep us posted.
>
> --
> Cheers
> Steve

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What do you mean? I don't have a "live specimen" of bamboo lying arround
so I did this from memory and as far as I now bamboo has no rings.

Rob.

"Greg M. Johnson" schreef:

> Rings?
>
> Rob Verweij wrote:
>
> > Hi,  Here's my fiirst bamboo-texture test. Any comments/suggestions?
> > Rob.

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In article <3A33CF91.5BD0CCE0@worldonline.nl>, Rob Verweij 
<rg.### [at] worldonlinenl> wrote:

> What do you mean? I don't have a "live specimen" of bamboo lying arround
> so I did this from memory and as far as I now bamboo has no rings.

I think he means the segments...
In case you don't know what *I* am talking about, bamboo is composed of 
many segments joined end to end. Your image appears to be a single 
segment of bamboo. The joints between segments make visible rings, which 
are nothing like the rings in wood.

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

<><

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Yes, I figured he meant that but I couldn't find the right word for it:
segments (duh!) thanks for helping me out.
I have some difficulties on deciding what the best way of "modeling" is for
the segments. Texturing them is easy but "modeling" them isn't (well at least
for me it isn't). I thought I could do it by using a gradient bump map but
that doesn't look realistic. Well back to the drawingboard to figure out a way
to do the segments.

Thanx,

Rob.

Chris Huff schreef:

> In article <3A33CF91.5BD0CCE0@worldonline.nl>, Rob Verweij
> <rg.### [at] worldonlinenl> wrote:
>
> > What do you mean? I don't have a "live specimen" of bamboo lying arround
> > so I did this from memory and as far as I now bamboo has no rings.
>
> I think he means the segments...
> In case you don't know what *I* am talking about, bamboo is composed of
> many segments joined end to end. Your image appears to be a single
> segment of bamboo. The joints between segments make visible rings, which
> are nothing like the rings in wood.
>
> --
> Christopher James Huff
> Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
> TAG: chr### [at] tagpovrayorg, http://tag.povray.org/
>
> <><

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One way would be to make them using lathe objects. Or if you are
mathematically inclined you could use isosurfaces.

"Rob Verweij" <rg.### [at] worldonlinenl> wrote in message
news:3A3474B9.1A25890E@worldonline.nl...
> Yes, I figured he meant that but I couldn't find the right word for it:
> segments (duh!) thanks for helping me out.
> I have some difficulties on deciding what the best way of "modeling" is
for
> the segments. Texturing them is easy but "modeling" them isn't (well at
least
> for me it isn't). I thought I could do it by using a gradient bump map but
> that doesn't look realistic. Well back to the drawingboard to figure out a
way
> to do the segments.
>
> Thanx,
>
> Rob.
>
> Chris Huff schreef:
>
> > In article <3A33CF91.5BD0CCE0@worldonline.nl>, Rob Verweij
> > <rg.### [at] worldonlinenl> wrote:
> >
> > > What do you mean? I don't have a "live specimen" of bamboo lying
arround
> > > so I did this from memory and as far as I now bamboo has no rings.
> >
> > I think he means the segments...
> > In case you don't know what *I* am talking about, bamboo is composed of
> > many segments joined end to end. Your image appears to be a single
> > segment of bamboo. The joints between segments make visible rings, which
> > are nothing like the rings in wood.
> >
> > --
> > Christopher James Huff
> > Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
> > TAG: chr### [at] tagpovrayorg, http://tag.povray.org/
> >
> > <><
>

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"Rob Verweij" <rg.### [at] worldonlinenl> wrote in message
news:3A3474B9.1A25890E@worldonline.nl...
> I have some difficulties on deciding what the best way of "modeling" is for
> the segments. Texturing them is easy but "modeling" them isn't (well at least
> for me it isn't). I thought I could do it by using a gradient bump map but
> that doesn't look realistic. Well back to the drawingboard to figure out a
way
> to do the segments.

After seeing this thread on bamboo I thought I'd try it using some made-up
function in a isosurface.
I got as far as an undulating shape but nothing like actual bamboo so I moved
on to a simple CSG of cylinders and tori and that was better.  Then came the
while loop scaling and translating, no good yet.  And even if I ever get it
about right it would never have the imperfections of real bamboo as I was
hoping for by doing a isosurface of it.
I went so far as to try searching out a equation of such a shape... without any
luck of course.

Bob H.

Post a reply to this message

On Mon, 11 Dec 2000 07:31:21 +0100, Rob Verweij
<rg.### [at] worldonlinenl> wrote:

>I have some difficulties on deciding what the best way of "modeling" is for
>the segments. Texturing them is easy but "modeling" them isn't (well at least
>for me it isn't). I thought I could do it by using a gradient bump map but

I've tested my function posted in p.a-u and it works ok. I Threw in
some variable names just so you know what to tweak. The
R*(.995-y*.005) part is used to make the straw thinner at the top.

$R=3;
$Segment_curve=2;
$Segment_length=5;
isosurface {
    function {
sqrt(Segment_curve*cos(y/Segment_length))+x^2+z^2-R*(.995-y*.005)}
    accuracy 0.001
    contained_by{box{-<R,50,R>,<R,50,R>}}
    pigment {rgb .9} finish {phong 0.5 phong_size 10}
}

sig
-- 
ICQ 74734588

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Sigmund Kyrre Aas wrote:

> $R=3;
> $Segment_curve=2;
> $Segment_length=5;
> isosurface {
>     function {
> sqrt(Segment_curve*cos(y/Segment_length))+x^2+z^2-R*(.995-y*.005)}
>     accuracy 0.001
>     contained_by{box{-<R,50,R>,<R,50,R>}}
>     pigment {rgb .9} finish {phong 0.5 phong_size 10}
> }

This doesn't quite convey the structure I'm used to seeing.
  http://www.artmarquetry.com/gallery/mretter/mr-p07.html
is much closer.

I saw a lot of wild bamboo growing up in Virginia in the US of all places   . . .

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"Greg M. Johnson" <gre### [at] my-dejanewscom> wrote in message
news:3A353D36.5B331066@my-dejanews.com...
>
> This doesn't quite convey the structure I'm used to seeing.
>   http://www.artmarquetry.com/gallery/mretter/mr-p07.html
> is much closer.
>
> I saw a lot of wild bamboo growing up in Virginia in the US of all places   .
. .
>

Maybe this is better, less curvature, I went about tweaking on the script code
by Sigmund.  Added a color gradient pattern.

$R=3;
$Segment_curve=.2;
$Segment_length=5;
isosurface {
    function {
sqrt((Segment_curve/4)*cos(y*1.5/Segment_length)/.15)+(x^2+z^2)-R*(1-y*.005)}
    accuracy 0.001
    contained_by{box{-<R,50,R>,<R,50,R>}}
    pigment {gradient y color_map {
        [.05 color rgb <.35,.55,.35>]
        [.1 color rgb <.4,.75,.55>]
        } scallop_wave translate .49*y scale Segment_length*2.1
    }
    finish {diffuse .7 phong 0.5 phong_size 10}
}

I too have seen bamboo around here, from fishing poles to the living stuff, and
it can vary a lot I guess depending on where and what species it is.  Although
it always has the same segmentation characteristic of course.
The kind growing around here in northern Alabama US seems to like hillsides.  I
always think of bamboo as a swamp plant though but I can't ever recall seeing
any in swamps.
Here's a picture gallery of bamboo: http://www.lewisbamboo.com/plants.html

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Yeah, that's probably better. Didn't know they could grow that big (as
in you link). My experience with bamboo is ski poles, never seen a
live one.

sig
-- 
ICQ 74734588

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