Alf Peake wrote:

> (3rd repost, seems I can only reply to my original post)
>
> Subject: ReDragonfly revisited 39k
> Date: 25 August 2000 20:54
>
> Tor Olav Kristensen <tto### [at] onlineno> wrote in message
> news:39A45056.32E778EF@online.no...
> >
> > Nice !
> Thank you.
>
> >
> > I like the red glass a lot. What's the code for it ?
> #declare Filtr=0.95; // Used ior 1.45 in final merged objects.
> #declare GlassF = finish{ phong 0.4 phong_size 400 diffuse 0.1
> reflection 0.05 ambient 0.5 }
> Object{ Thorax pigment{ rgbf <1,0.2,0.2,Filtr> } finish{ GlassF } }

Thank you!  I'll try that.


> > And how are the wings done ?
> // The PNG is wing-shaped crackle, blurred to round-off the outer
> edges.
> #declare Wing=
> difference{ box{ <0,-1,0>, 0.996 }
>             height_field{ png "dragonhf.png" smooth translate -y*0.25
> inverse }
>             height_field{ png "dragonhf.png" smooth scale <1,-1, 1>
> translate y*0.25 inverse }
>      translate <-0.02,0,-0.95>
>      scale <5.5,0.05,1.5> // Front pair. Rear pair will scale this
> one.
>      rotate <-16,-104,0>
>      pigment{ rgbf <0.8,0.9,1,Filtr> } finish{ GlassF }
> }

Ahh... Height fields !

Thanks again.


> > There seems to be some problems with the attachment of the
> > rear wings to the body.
> Yes, its that blob / camera angle thingy again. Same sort of thing
> happens with 'lipsoids. I also lose the shadow with some angles.
> The jpeg shows a close up, camera over left wings, (leading edge to
> the left) all other objects removed, tail would be to the right. The
> left 2 sections are opaque, no photons, with camera <0,4,-4> and the
> right one is clear with photons and camera <0,5,-3>. Note the right
> pair of wings do not connect in this one :(

I wasn't aware that there were such problems with blobs.
Is it a photons-only error, or can it happen to me in standard POV
as well ?

What are 'lipsoids in POV-ray ?


> See also a larger version, 88k,  of the pic I uploaded here in March:
>
> http://www.peake42.freeserve.co.uk/pix1/dragnfly.jpg

May I ask how you generate that Fibonacci stuff ?

I have a vague memory of a Golden Ratio between the
number of right turns and the number of left turns (?)


Tor Olav
--
mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok/tokrays.html

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