Lindenmayer Systems • Hacker News Board

Re: Lindenmayer Systems

#31

Post by phforms » Mon, Oct 30, 2023, 7:51 PM UTC

peterldowns wrote: post #13

If you're interested in L-systems you may also enjoy reading about Shape Grammars. Sort of an evolutionary dead-end in terms of system design, but intriguing. As far as I can tell they were basically superceded by other types of programmatic or parametric design systems. Some references: - http://web.mit.edu/~haldane/www/icerays/ - https://vincentmai.com/Shape-Grammar - https://wiki.ece.cmu.edu/ddl/index.php/Shape_gr…

Thanks for sharing, I never heard about this before! The Wikipedia article on shape grammar has a link to an old website[1] from a workshop at MIT that links to many more interesting resources, including the “Shape” book by George Stiny you mentioned as a free download (not sure if the author agreed to this, so I’ll just use it as a reading sample and buy the book if I like it), course material, presentations, etc.

I also found a more recent book[2] by George Stiny called “Shapes of Imagination: Calculating in Coleridge's Magical Realm” that is also about shape grammars and is actually open access. Coming from a design background, I am sure to take a closer look at some of this stuff.

- [1] https://web.archive.org/web/20190405160829/http://shapegramm...

- [2] https://direct.mit.edu/books/oa-monograph/5489/Shapes-of-Ima...

Re: Lindenmayer Systems

#32

Post by fallat » Mon, Oct 30, 2023, 8:03 PM UTC

motohagiography wrote: post #14

Are simple esolangs like BF also L-systems?

BrainFuck? no. L-systems are a string rewriting language basically. L-systems though are more about the patterns they make when they're interpreted more than anything else.

Re: Lindenmayer Systems

#33

Post by kaveh808 » Mon, Oct 30, 2023, 8:38 PM UTC

BaraBatman wrote: post #19

I once tried my own L-system generator on lisp! Take a look https://github.com/FdelMazo/cl-aristid

Very cool. I must check this out.

I implemented some L-system features in my 3D Common Lisp system: https://github.com/kaveh808/kons-9

Re: Lindenmayer Systems

#34

Post by gowld » Mon, Oct 30, 2023, 9:37 PM UTC

Lots of web apps for L-Systems:

https://www.google.com/search?q=l-systems+generator

Re: Lindenmayer Systems

#35

Post by karlin » Mon, Oct 30, 2023, 10:47 PM UTC

Always fun to see an interactive L-System implementation!

This one seemed to have odd line weights to me... until I realized that the default F-Reproduction value seems to have a bug: I think it's supposed to be "F[-F]F[+F]F" instead of "F[-F]F[+F][F]"?

- https://github.com/rue-a/L-Systems/blob/d725d7da9a2c96afabfc...