Thanks!
Hm, so that dividing along the length with the texturing
trick... Do you use just two triangles per blade, or
more? Thats what I couldn't figure out from yer description.

How fast is it? And yet to be answered: how many blades
are in the currect scene?

-- 
Tim Nikias v2.0
Homepage: http://www.digitaltwilight.de/no_lights
Email: Tim### [at] gmxde

> Darn, my news reader just crashed as I was writing a reply to this! I'll
try and
> remember what I said...
>
> Basically it's just a mesh. Each blade is triangular, and is divided in
two
> along it's length so I can texture it. The texture is uv mapped so that
the
> blade is opaque at the center of it's base, and fades to transparent at
the
> edges. This gives a nice soft appearance without the need for hundreds of
focal
> blur samples :) The blades also vary slightly in colour.
>
> Each blade is placed using the trace() function, by firing a ray
vertically down
> onto the object. The blade is oriented to point in the direction of the
surface
> normal, and then the top point is displaced by a vturbulence() function
and a
> small random displacement.
>
> Here's a couple of bits of source code to help explain that:
>
> //trace a position onto the object
> #macro m_Place(vP)
>  (trace( oHill, vP+y*5, -y + .3*(<rand(rs),rand(rs),rand(rs)>-.5),
vPlaceNorm )
> + vP.y*y)
> #end
>
> #declare vPos = 1.3*<rand(rs)*2-1,0,rand(rs)*2-1>;
> #declare vPos = m_Place(vPos);
>
> #declare vTop = vPos + vPlaceNorm*.0025;
> #declare vTop = vTop + (vturbulence(2, .5, 6, vPos*20)*.0004 +
> (<rand(rs),rand(rs),rand(rs)>-.5)*.0004)*<1,.3,1>;
>
> I can post the full source if you like, but I'll probably carry on working
on
> this image so I'd rather wait until it's "finished".
>
> --
> Tek
> http://www.evilsuperbrain.com
>
>
> "Tim Nikias v2.0" <tim### [at] gmxde> wrote in message
> news:3eebbd41$1@news.povray.org...
> > Would you care to explain a little more in detail how you've
> > gone about creating the grass? Placing, object's orientation,
> > how many are there, texturing? It looks really great.
> >
> >
> > --
> > Tim Nikias v2.0
> > Homepage: http://www.digitaltwilight.de/no_lights
> > Email: Tim### [at] gmxde
> >
> > > > Fantastic! Add some flowers, bees or butterflys,
> > > > position the camera a little different to make
> > > > the fractal more visible, and you've made yourself
> > > > a picture worthy of Zazzle!
> > >
> > > Good ideas, that's the kind of thing this scene needs. Though at the
> > moment I'm
> > > playing with the lighting instead...
> > >
> > > I have to admit I didn't think it was that good, but people really
seem to
> > have
> > > picked up on the atmosphere of it so I think I'll develop it further
:)
> > >
> > > --
> > > Tek
> > > http://www.evilsuperbrain.com
> > >
> > >
> >
> >
>
>

Post a reply to this message