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I made the following images with a little macro (available on my web
page) that creates star-shaped prisms. I made the macro in order to
make one of those "NEW AND IMPROVED" stickers that appear on products.
I'm in the process of making my first IRTC entry, and it is for that.
I'm not sure if I'll finish it or not, but it's nice to actually have a
goal instead of just screwing around. It helps motivate me.
Kevin Jackson-Mead
http://www.mindspring.com/~jacksonmead
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Attachments:
Download 'startest.png' (16 KB)
Download 'weird.png' (86 KB)
Preview of image 'startest.png'
Preview of image 'weird.png'
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Seems I'm always forgetting stuff. The first image should be fairly
self-explanatory. The second image is a star with 1123 points (no
significance in the number, I just wanted to try something large). As you can
see, some weird stuff is going on. Any ideas exactly what's causing it?
Kevin Jackson-Mead
http://www.mindspring.com/~jacksonmead
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Kevin Jackson-Mead wrote:
>
> see, some weird stuff is going on. Any ideas exactly what's causing it?
Aliasing. Too low sampling frequency folds high frequencies over lower
frequencies. Cure: +a0.1 +r5 or render at 2x,3x, etc. resolution and
sample down.
______________________________________________________________________
Kari Kivisalo http://www.kivisalo.net
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Kari Kivisalo wrote:
> Kevin Jackson-Mead wrote:
> >
> > see, some weird stuff is going on. Any ideas exactly what's causing it?
>
> Aliasing. Too low sampling frequency folds high frequencies over lower
> frequencies. Cure: +a0.1 +r5 or render at 2x,3x, etc. resolution and
> sample down.
>
> ______________________________________________________________________
> Kari Kivisalo http://www.kivisalo.net
Got it. Thanks. The unintended "folding" is kind of neat, though. Might
have to experiment with that.
Kevin Jackson-Mead
http://www.mindspring.com/~jacksonmead
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On Wed, 23 Aug 2000 19:33:31 -0400, Kevin Jackson-Mead wrote:
>This is a multi-part message in MIME format.
>--------------28E3F4E06E0E99FB317A2596
>Content-Type: text/plain; charset=us-ascii
>Content-Transfer-Encoding: 7bit
>
>I made the following images with a little macro (available on my web
>page) that creates star-shaped prisms. I made the macro in order to
>make one of those "NEW AND IMPROVED" stickers that appear on products.
>I'm in the process of making my first IRTC entry, and it is for that.
>I'm not sure if I'll finish it or not, but it's nice to actually have a
>goal instead of just screwing around. It helps motivate me.
This looks useful. Thanks for your effort.
--
Cheers
Steve email mailto:ste### [at] zeropps uklinuxnet
%HAV-A-NICEDAY Error not enough coffee 0 pps.
web http://www.zeropps.uklinux.net/
or http://start.at/zero-pps
12:26pm up 2 days, 16:44, 2 users, load average: 1.04, 1.06, 1.05
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On Wed, 23 Aug 2000 19:43:00 -0400, Kevin Jackson-Mead wrote:
>Seems I'm always forgetting stuff. The first image should be fairly
>self-explanatory. The second image is a star with 1123 points (no
>significance in the number, I just wanted to try something large). As you can
>see, some weird stuff is going on. Any ideas exactly what's causing it?
For the second one, maybe try increasing max_trace_level.
--
Cheers
Steve email mailto:ste### [at] zeroppsuklinuxnet
%HAV-A-NICEDAY Error not enough coffee 0 pps.
web http://www.zeropps.uklinux.net/
or http://start.at/zero-pps
12:26pm up 2 days, 16:44, 2 users, load average: 1.04, 1.06, 1.05
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Steve wrote:
>
> For the second one, maybe try increasing max_trace_level.
>
Won't help: max_trace_level is only useful when there is reflection or
refraction. The only solution is to increase the resolution (either
directly or through anti-aliasing).
--
* Doctor Jekyll had something * mailto:ber### [at] inamecom
* to Hyde... * http://www.enst.fr/~jberger
*******************************
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In article <39A48079.490D2CB2@mindspring.com>, Kevin Jackson-Mead
<jac### [at] mindspringcom> wrote:
> Got it. Thanks. The unintended "folding" is kind of neat, though.
> Might have to experiment with that.
It's a sort of moire effect...try making a wood or onion pigment scaled
*very* small for some other interesting effects.
--
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/
<><
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After looking up "moire effect", I tried as you suggested. Pretty neat. I
think I'm going to put off experimenting with some more of this until the
current IRTC round is over. Hopefully I can get a somewhat presentable
first attempt at an entry in.
Kevin Jackson-Mead
http://www.mindspring.com/~jacksonmead
Chris Huff wrote:
> In article <39A48079.490D2CB2@mindspring.com>, Kevin Jackson-Mead
> <jac### [at] mindspringcom> wrote:
>
> > Got it. Thanks. The unintended "folding" is kind of neat, though.
> > Might have to experiment with that.
>
> It's a sort of moire effect...try making a wood or onion pigment scaled
> *very* small for some other interesting effects.
>
> --
> Christopher James Huff
> Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
> TAG: chr### [at] tagpovrayorg, http://tag.povray.org/
>
> <><
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