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globes.ps -- how does it work?

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  globes.ps -- how does it work? Ross Presser <rpresser@gmail.com> - 2015-09-28 15:28 -0700
    Re: globes.ps -- how does it work? Ross Presser <rpresser@gmail.com> - 2015-09-28 15:29 -0700
      Re: globes.ps -- how does it work? luser- -droog <mijoryx@yahoo.com> - 2015-09-28 22:01 -0700
      Re: globes.ps -- how does it work? Maurizio Loreti <mlo@foobar.it> - 2015-09-30 08:31 +0200
    Re: globes.ps -- how does it work? jdaw1 <jdawiseman@gmail.com> - 2015-09-29 03:26 -0700
      Re: globes.ps -- how does it work? jdaw1 <jdawiseman@gmail.com> - 2015-09-29 03:33 -0700

#2350 — globes.ps -- how does it work?

A mere 11 densely-packed lines of postscript, that produces a raytraced scene
of reflecting spheres. How on earth does it work?


A/copy/p/floor/q/gt/S/add/n/exch/i/index/J/ifelse/r/roll/w/div/H{{loop}stopped
Y}def/t/and/C/neg/T/dup/h/exp/Y/pop/d/mul/s/cvi/e/sqrt/R/rlineto{load def}H 300
T translate(V2L&1i2A00053r45hNvQXz&vUX&UOvQXzFJ!FJ!J!O&Y43d9rE3IaN96r63rvx2dcaN
G&140N7!U&4C577d7!z&&93r6IQO2Z4o3AQYaNlxS2w!!f&nY9wn7wpSps1t1S!D&cjS5o32rS4oS3o
Z&blxC1SdC9n5dh!I&3STinTinTinY!B&V0R0VRVC0R!N&3A3Axe1nwc!l&993dC99Cc96raN!a&1CD
E&YYY!F&&vGYx4oGbxSd0nq&3IGbxSGY4Ixwca3AlvvUkbQkdbGYx4ofwnw!&vlx2w13wSb8Z4wS!J!
c&j1idj2id42rd!X&4I3Ax52r8Ia3A3Ax65rTdCS4iw5o5IxnwTTd32rCST0q&eCST0q&D1!&EYE0!J
&EYEY0!J0q!x&jd5o32rd4odSS!K&WCVW!Q&31C85d4!k&X&E9!&1!J!v&6A!b&7o!o&1r!j&43r!W)
{( )T 0 4 3 r put T(/)q{T(9)q{cvn}{s}J}{($)q{[}{]}J}J cvx}forall 270{def}H
K{K{L setgray moveto B fill}for Y}for showpage

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#2351

On Monday, September 28, 2015 at 6:29:03 PM UTC-4, Ross Presser wrote:
> A mere 11 densely-packed lines of postscript, that produces a raytraced scene
> of reflecting spheres. How on earth does it work?

typo: there should be a slash / before the A on the first line.

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#2352

On Monday, September 28, 2015 at 5:29:48 PM UTC-5, Ross Presser wrote:
> On Monday, September 28, 2015 at 6:29:03 PM UTC-4, Ross Presser wrote:
> > A mere 11 densely-packed lines of postscript, that produces a raytraced scene
> > of reflecting spheres. How on earth does it work?
> 
> typo: there should be a slash / before the A on the first line.

There's a very nice write-up of the C++ here:
http://fabiensanglard.net/rayTracing_back_of_business_card/

I think these are all based on the Paul Heckbert et al. version
from Graphics Gems IV. All the golfed postscript ones I've looked
at were derived from this PS program, itself derived from Heckbert
et al. https://www.cs.cmu.edu/~ph/src/minray/minray.ps.code

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#2355

Ross Presser <rpresser@gmail.com> writes:

> On Monday, September 28, 2015 at 6:29:03 PM UTC-4, Ross Presser wrote:
>> A mere 11 densely-packed lines of postscript, that produces a raytraced scene
>> of reflecting spheres. How on earth does it work?
>
> typo: there should be a slash / before the A on the first line.

A classic Amiga screenshot...

-- 
(@_  | Maurizio Loreti
//\  |
V_/_ | EMail/ROT13: Znhevmvb.Ybergv@tznvy.pbz

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#2353

That is very impressive coding.

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#2354

... but a natively PostScript version should be calling shfill rather than painting pixels.

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