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Donut math - How donut.c works

a1k0n.net

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Re: Donut math - How donut.c works

#12

Post by bigiain »

swah wrote: post #2

In the 90's, I always wondered how this stuff worked.

And now it's 2011, I'm almost expecting some bright-young-thing to post up an alternative method, which involves offloading the 3d render and animation to the video card, painting that onto an invisible html5 canvas, then using JavaScript to paint ASCII characters over the top based on the average brightness/colour of regions of the hardware generated image...

Re: Donut math - How donut.c works

#15

Post by gabebw »

abjr wrote: post #11
dmuino wrote: post #8

Earlier quoted context omitted.

http://a1k0n.net/

If you haven't done it yet, click the code on the bottom of that page :)

A slightly unobfuscated version of that code:

  counter=0;
  pointer;
  main(){
    while(counterP"
          "NY8^$#SM):XA"[counter/6]-35>>counter++%6&1;
        pointer++);
      putchar(" _/\\\n,`)('

Re: Donut math - How donut.c works

#17

Post by kqr2 »

If you like deconstructing obfuscated c, then you may also enjoy Obfuscated C And Other Mysteries by Don Libes. In addition to coding advice, it looks at some of the top entries from the Obfuscated C Contest, 1984-1991.

http://www.amazon.com/gp/product/0471578053/

Also appears to be available as a reprint:

http://www.cafepress.com/libes.43758522

Obfuscated C Contest website:

http://www.ioccc.org/

Re: Donut math - How donut.c works

#18

Post by rmccue »

a1k0n wrote: post #4

In a highly technical post like this I'm never sure how well I'm explaining it. I tried to keep things at the high school trig/algebra II level for this one. I've proofread it a billion times now but is there anything I can clarify?

As a high school student, I can confirm you explained it well and I was able to follow it the entire way though. :)

Re: Donut math - How donut.c works

#20

Post by JonnieCache »

bigiain wrote: post #12
swah wrote: post #2

In the 90's, I always wondered how this stuff worked.

And now it's 2011, I'm almost expecting some bright-young-thing to post up an alternative method, which involves offloading the 3d render and animation to the video card, painting that onto an invisible html5 canvas, then using JavaScript to paint ASCII characters over the top based on the average brightness/colour of regions of the hardware generated image...

Isn't that basically how the various ASCII renderers for 3d games over the years have worked? Minus the html5 canvas obviously, although being as you can run the entire of quake in javascript/webgl, that can't be far off.

Good old aalib.

http://aa-project.sourceforge.net/

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