Bunny landfill.

lylejk · **Joined:** Sep 24, 2010 **Posts:** 12535

Just an exercise in circle perspective (circle to line conversion) w/ Mathmap. I like this techniques since it gives you a better result the straight seamless texture perspective techniques (no obvious distortions for those that know what I'm referring to). Also, this technique doesn't require you to even have a seamless texture. May (or may not) make a tutorial soon.

As for why I chose bunnies, it's not that far off before Easter's here so why not bunnies (used DAP to generate the bunnies). lolol

http://www.flickr.com/photos/34520999@N ... 3/sizes/o/

Erisian · **Posted:** Wed Feb 26, 2014 12:48 pm **(#2)**

Excellent. I hope you do make a tutorial as this will probably prove very useful.

lylejk · **Joined:** Sep 24, 2010 **Posts:** 12535

I usually modify the mathmap code in interactive mode since I don't like the limits set by the author. That said, I kept this tute orthodox for simplicity (the bunny one I used two passes and blended together healing the seam with resynthesizer and I'm not going to do a tute for that since I'm lazy; lol). Anyway, first the pertinent links:

ref pattern (again, you don't really need a patter; just a bunch of objects, but patterns make things easier): http://lylejk.deviantart.com/art/Nylon-Splash-357050998

Mathmap preset (not my code; found it at the Mathmap forum at Flickr but can't find the link for the moment; I named it circ2line in my presets):

Code: Select all

filter moon2panorama(
         image in,
         bool center_help (0),
         float center_x: -20-20 (0),
         float center_y: -20-20 (0),
         float span: 270-450 (360),
         float shift_x: -200-200 (0),
         float shift_y: -200-200 (0)
     )
     scaled = ri:[x, y/(1+9*center_help)]/W*span;
     shifted = (scaled - ri:[shift_x, shift_y])*pi/180;
     remapped = I*exp(-I*shifted);
     centered = (remapped*0.8+ri:[center_x, center_y]/100)*min(X, Y);
     if center_help && abs(y/Y) < 0.01 then
         rgbColor(1, 1, 0)
     else
         in(xy:[centered[0], centered[1]])
     end
end

First create a perfect circle selection and fill it (or select your object and copy paste):

Attachment:

fill_circle.png [ 931.25 KiB | Viewed 3296 times ]

Now run the preset adjusting span and shift_y as needed (this is where I edited the code interactively, but that's by choice; here I left everything as default per my earlier spiel):

Attachment:

cirlin.png [ 279.12 KiB | Viewed 3296 times ]

Cropped and flattened with black background to share here:

Erisian · **Posted:** Wed Feb 26, 2014 1:59 pm **(#4)**

What file type do I save this as?

lylejk · **Joined:** Sep 24, 2010 **Posts:** 12535

zipped and attached the file Erisian.

Erisian · **Posted:** Wed Feb 26, 2014 2:23 pm **(#6)**

Nice one Lyle - thank you

molly · **Joined:** Apr 07, 2010 **Posts:** 14182

Very nice Lyle.

lylejk · **Joined:** Sep 24, 2010 **Posts:** 12535

Thanks Molly.

schroedinger · **Joined:** Jan 13, 2014 **Posts:** 16

now i have to figure out how to use mathmap just to try this!

i have it installed but i haven't gotten any tutorials read, so all i've done was open mathmap, stare at it blankly and closed it again :cool

lylejk · **Joined:** Sep 24, 2010 **Posts:** 12535

If you see the plugin after launch, that's half the battle Schroedinger. You can either copy the text file above (if you are in interactive mode) or run the preset directly by browsing for it. The main support page for Mathmap is below.

http://www.complang.tuwien.ac.at/schani/mathmap/

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