 |
|
|
|
|
|
| |
| |
|
|
|
|
| |
| |
|
|
Something reminded me of this graphic that I'd seen about 20 years ago when
I was attending an ACM symposium. When I got back to my office, I coded it
up in Fortran and printed it on a Calcomp plotter. Yeah, shows my age, but
isn't it still an amazing eye trick? I tried using various textures and
lighting schemes with POV, but it seems to work best as a simple B/W image
and orthographic perspective. Anyone want a wallpaper version?
-- Dave
Post a reply to this message
Attachments:
Download 'ACMIllusionSm.jpg' (122 KB)
Preview of image 'ACMIllusionSm.jpg'
|
|
| |
| |
|
|
|
|
| |
| |
|
|
I liked very much the optical illusion it creates!
Fernando.
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
Hey! Stop trying to hipnotize people!!! :D
Kool but weird stuff. Can't stand looking at it for more than some seconds
at a time. :P
Ever thought on doing an animated version of it?
Best regards.
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
What an elegant and simple algorithm! I can see that all you need is a
simple rule: from a starting position, generate n cells such that from cell 0
to cell n/2, you make a 90 degree turn in uniform steps, then "unturn" the same
way until n.
Once the first row is done, use each cell as the seed for the column using
the same algorithm. I like it!
Cheers!
Chip Shults
My robotics, space and CGI web page - http://home.cfl.rr.com/aichip
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
That's a directional field for a differential equation, and it is
very cool. What is the equation for it? I'd like to know because I have
played with differential equations on povray a bit too. The attached image
(54.7 kb) is an example of output from my system of diff-eq d-field plotting
script, with all of the showy features activated. The equations are:
x_prime = Y-cos(X); y_prime = X-Y; What do you think?
-Ben Scheele
Post a reply to this message
Attachments:
Download 'dfield2.jpg' (55 KB)
Preview of image 'dfield2.jpg'
|
|
| |
| |
|
|
|
|
| |
| |
|
|
thats pretty cool. definately math textbook cover worthy
"Ben T. Scheele" <sch### [at] tc umnedu> wrote in message
news:3df414a7@news.povray.org...
> That's a directional field for a differential equation, and it is
> very cool. What is the equation for it? I'd like to know because I have
> played with differential equations on povray a bit too. The attached
image
> (54.7 kb) is an example of output from my system of diff-eq d-field
plotting
> script, with all of the showy features activated. The equations are:
> x_prime = Y-cos(X); y_prime = X-Y; What do you think?
>
> -Ben Scheele
>
>
>
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
Ben T. Scheele wrote:
> That's a directional field for a differential equation, and it is
>very cool. What is the equation for it?
I'm just guessing but y' = -arccot(|x| + |y|) would fit.
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
"Fernando Gonzalez del Cueto" <fgd### [at] hotmailcom> wrote in message
news:3df3f056$1@news.povray.org...
> I liked very much the optical illusion it creates!
>
Which is what?
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
Wow, thanks. Most of my math textbooks just have pictures of odd
architecture with lots of glass, and that's just fine. It's the grade
school math textbook covers that need cooler graphics. I guess they need a
lot more than that, but third graders don't usually study differential
equations, after all. Thanks again.
-Ben Scheele
"Ross Litscher" <lit### [at] osuedu> wrote in message
news:3df421f0$1@news.povray.org...
> thats pretty cool. definately math textbook cover worthy
>
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
Thanks, but I can't seem to figure out how to make that work. All I
could get was this. No, just kidding. But in povray, the fuction for
arctan is kind of confusing. I have two versions of plotters, one that uses
dx/dt and one that uses dy/dx. I'll just have to wait for David's
explanation I guess.
-Ben Scheele
"Mack Tuesday" <mailbjl@yahoo> wrote in message
news:web.3df456428451b87c54f5973f0@news.povray.org...
> Ben T. Scheele wrote:
> > That's a directional field for a differential equation, and it is
> >very cool. What is the equation for it?
>
> I'm just guessing but y' = -arccot(|x| + |y|) would fit.
>
Post a reply to this message
Attachments:
Download 'dfield2d pbi example.jpg' (58 KB)
Preview of image 'dfield2d pbi example.jpg'
|
|
| |
| |
|
|
|
|
| |
| |
|
|
well, my diff. eq. book had a cool looking graph on it, but it wasn't nearly
as cool as yours. i do remember grade school math book covers being angular
and architectural though.
Ben T. Scheele <sch### [at] tcumnedu> wrote in message
news:3df54909@news.povray.org...
> Wow, thanks. Most of my math textbooks just have pictures of odd
> architecture with lots of glass, and that's just fine. It's the grade
> school math textbook covers that need cooler graphics. I guess they need
a
> lot more than that, but third graders don't usually study differential
> equations, after all. Thanks again.
>
> -Ben Scheele
>
>
> "Ross Litscher" <lit### [at] osuedu> wrote in message
> news:3df421f0$1@news.povray.org...
> > thats pretty cool. definately math textbook cover worthy
> >
>
>
>
>
>
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
> Ever thought on doing an animated version of it?
For something similar, have a look in p.b.a, entitled "Warning: May do
nasty things to your eyes (Divx 5, 744Kbu) - fred.avi [0/1]"
Jamie.
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
Wow! Thanks for the tip. It is really cool, but it really gives me the
headaches to look at. :P
How can such a collection of simple things moving affect the brain like
that?
Best regards.
"Jamie Davison" <jam### [at] ntlworldcom> wrote in message
news:MPG.18606382e8b8d68d989c3e@news.povray.org...
> > Ever thought on doing an animated version of it?
>
> For something similar, have a look in p.b.a, entitled "Warning: May do
> nasty things to your eyes (Divx 5, 744Kbu) - fred.avi [0/1]"
>
> Jamie.
>
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
"Greg M. Johnson" <gregj:-)565### [at] aolcom> wrote in message
news:3df49f14$1@news.povray.org...
>
> "Fernando Gonzalez del Cueto" <fgd### [at] hotmailcom> wrote in message
> news:3df3f056$1@news.povray.org...
> > I liked very much the optical illusion it creates!
> >
>
> Which is what?
It may depend on your video mode. I posted a rather modest 640x640 image. If
your video mode is really high you may not get the optical effect. I'm
running 1280x1024.
If not that, maybe it's one of those stereogram thingies that only some
people can see.
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
> Wow! Thanks for the tip. It is really cool, but it really gives me the
> headaches to look at. :P
>
> How can such a collection of simple things moving affect the brain like
> that?
It's all to do with the way the human visual system works (you are
human, aren't you? ;) and enhances contrast, looks for patterns
etc.etc. and quite a bit of which is 'preprocessed' in the retina.
BTW, there's another sort of version in the same thread now.
Jamie.
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
"Jamie Davison" <jam### [at] ntlworldcom> wrote in message
news:MPG.1861b9c71e882da7989c42@news.povray.org...
> It's all to do with the way the human visual system works (you are
> human, aren't you? ;)
Well, my mom says I am, but I don't know :)) he he he
> BTW, there's another sort of version in the same thread now.
>
> Jamie.
>
Thanks. I've seen it and it makes me feel dizzy too, although the first one
is more "hipnotic" to me, mabe because it isn't as simmetric as the second
one.
Pretty cool stuff.
Have you ever thought on doing something like that but in 3 dimmensions
(like a cube or something)? Mabe it won't work like that. I don't know.
Best regards
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
> Thanks. I've seen it and it makes me feel dizzy too, although the first one
> is more "hipnotic" to me, mabe because it isn't as simmetric as the second
> one.
>
> Pretty cool stuff.
>
> Have you ever thought on doing something like that but in 3 dimmensions
> (like a cube or something)? Mabe it won't work like that. I don't know.
Maybe I'll have a try, but it won't be 'till next week, as I'm off to a
10th wedding anniversary party for some friends of mine over the
weekend, and I'm heading off straight from work on Friday.
I do have some other ideas though, one of which should be cute if i can
get it to work :)
Jamie.
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
"Jamie Davison" <jam### [at] ntlworldcom> wrote in message
news:MPG.1862ff003b9c5cdf989c44@news.povray.org...
> Maybe I'll have a try, but it won't be 'till next week, as I'm off to a
> 10th wedding anniversary party for some friends of mine over the
> weekend, and I'm heading off straight from work on Friday.
>
> I do have some other ideas though, one of which should be cute if i can
> get it to work :)
>
> Jamie.
Cool. Can't wait to see them :))
Have a nice weekend. Enjoy the party ;D
Best regards
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
