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Bill DeWitt wrote:
>
> All it needs is a guy looking up at it. Make him so small that he can be
> mistaken for a spot, then you notice the shadow and the scale suddenly
> shifts...
Thank you for the idea Bill. I'm thinking
about how where I can get a human model from.
Tor Olav
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>
> Fantastic, I like the image just as it is.
>
> Congratulations,
I'm very glad you like it Fernando.
Thank you.
Tor Olav
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Gleb wrote:
>
> Looks nice.
Thanks.
> Will it form a whole sphere when combined
>
> with the y-rotated other textured one?
No. I'm sorry if the title of my prior
posts have confused you people.
This shape uses another PhiFn() than the one
I used for the shape in my "The remains of an
iso sphere: Take 2" image.
I think that I'll soon post some source code
for this image to p.t.s-f.
Tor Olav
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news:3c526337@news.povray.org...
> Yes, it is caused by the syntax change. I posted the revised one
> in p.t.s-f as a reply of that message. (I've added checker and hexagon
> pattern in that scene) I hope it is helpful for your project.
Wow!
Thank you very much.
Bye.
--
Txemi Jendrix
tji### [at] euskalnetnet
http://www.geocities.com/txemijendrix
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that would be great i would like to see the texture details... =]
Tor Olav Kristensen wrote:
> Gleb wrote:
> >
> > Looks nice.
>
> Thanks.
>
> > Will it form a whole sphere when combined
> >
> > with the y-rotated other textured one?
>
> No. I'm sorry if the title of my prior
> posts have confused you people.
>
> This shape uses another PhiFn() than the one
> I used for the shape in my "The remains of an
> iso sphere: Take 2" image.
>
> I think that I'll soon post some source code
> for this image to p.t.s-f.
>
> Tor Olav
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Tor Olav Kristensen wrote:
>...
> (Because there seems to be some
> calculations that are not calculated
> correctly by POV-Ray. Increasing
> max_gradient or accuracy did not help
> at all.)
>...
Attached are two images that shows
the defect in the shape.
IIRC Riemann16_s1.jpg was rendered with the
max_gradient set to 4 and for Riemann16_s2.jpg
it was set to 250.
(The images was rendered at different
resolutions and with different light settings.)
I find the "tongue" that appears in the _s2
image quite mysterious.
Tor Olav
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Attachments:
Download 'riemann16_s1.jpg' (13 KB)
Download 'riemann16_s2.jpg' (5 KB)
Preview of image 'riemann16_s1.jpg'
Preview of image 'riemann16_s2.jpg'
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Christoph Hormann wrote:
>...
> If that surface structure is a normal you could make it part of the
> isosurface geometry. Apart from that, do you have 'normal on' in
> radiosity?
I didn't think of that. Now I have started experimenting
with that. Thank you for the suggestion.
And yes, I had the normal on in radiosity.
>...
> > I should probably mention that I had
> > to "hand correct" the finished image
> > somewhat at the sphere's "south pole".
> >
> > (Because there seems to be some
> > calculations that are not calculated
> > correctly by POV-Ray. Increasing
> > max_gradient or accuracy did not help
> > at all.)
>
> I think it's quite obvious that spiral structures lead to infinite
> gradients which can't be rendered correctly under all circumstances.
Yes that was my first thought too.
But as this shape is symmetric around both
its x and z axes (as Anton Sherwood mentioned
too), there should be infinite gradients at
the opposite pole as well.
But I have not experienced any problems at
that pole yet.
Tor Olav
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Anton Sherwood wrote:
>
> Tor Olav:
> > > (Because there seems to be some
> > > calculations that are not calculated
> > > correctly by POV-Ray. Increasing
> > > max_gradient or accuracy did not help
> > > at all.)
>
> Slime:
> > If you defined the spiral correctly, that's because the spiral
> > never ends, the detail increases towards the poles infinitely.
> > That is, if I understood the description of the shape that I
> > read a while ago correctly.
>
> In an equiangular spiral (reverse Mercator projection of oblique
> parallels), that would happen at both poles; TOK said only one.
I don't remember what reverse Mercator projection is,
so I don't quite get what you are saying here.
But I guess that you are thinking the same as me:
That the problem should surface at the other pole as
well, because the gradients should be symmetric too.
> What's the formula?
I have posted the source to povray.text.scene-files now:
http://news.povray.org/povray.text.scene-files/21784/
news://news.povray.org/3C549C14.A9009E4%40online.no
> (Love the textures.)
I just modified one that Gilles Tran once made.
"Radiosity test #2", Aug 2000:
http://news.povray.org/search/?s=Radiosity+test+%232&b=Search
Tor Olav
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"R. Suzuki" wrote:
>
> "Tor Olav Kristensen" wrote in message
> > I'm not sure if this image is finished
> > or not now.
> >
> > What do you think ?
>
> Nice image.
Thank you.
> > I should probably mention that I had
> > to "hand correct" the finished image
> > somewhat at the sphere's "south pole".
> >
> > (Because there seems to be some
> > calculations that are not calculated
> > correctly by POV-Ray. Increasing
> > max_gradient or accuracy did not help
> > at all.)
>
> I tried to render your scene file posted in p.t.s-f
> last month. But I could not find any problem
> on the image. Did you use the same function?
You are right: The last scene file did not
produce any errors in the image.
For this image a used a different function
for the rotation. See my recent post to
povray.text.scene-files for the source code:
http://news.povray.org/povray.text.scene-files/21784/
news://news.povray.org/3C549C14.A9009E4%40online.no
Tor Olav
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"Tor Olav Kristensen" <tor### [at] onlineno> wrote in message
news:3C54A942.617AD2B5@online.no...
[snip]
> Attached are two images that shows
> the defect in the shape.
>
> I find the "tongue" that appears in the _s2
> image quite mysterious.
>
>
> Tor Olav
Perhaps this defect is only on the inner surfaces so the upper pole
looks OK from outside?
Alf
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