Raytracer 1.0

[emufan]

ah, ok. ssg is the renderer, E. Graham was using to produce the juggler anim. on the juggler page you can read:

Eric rendered the frames in a raytracer he wrote called ssg, a Sculpt precursor.

since the dat files are simple ascii files, it would be quiet easy to do some experiments.
but someone must find correct commandline parameters and decipher the syntax of the dat file-commands

[thellier]

Hello
>ssg is the renderer
Perhaps but I didnt investigate it

I thought that compiling (and having) the sources rt1.c rt2.c rt3.c was more interesting


In fact I am not 100% satisfied with my binary : ok it can render the juggler as a static image
(also can render a sphere, an elephant and a dragon .The dragon got one error)
buuut the image got some colors errors when compared to classic juggler pictures: I dont know if I introduced some errors when fixing the code or if it is the scene data I used that got an error
This is the reason why I havent uploaded this (yet) to Aminet :-/

Alain Thellier

Note: About the .dat files here it is what I have understood and that give (almost) good results
(spheres are ok but other variables usage may be misunderstood...)
From robot.dat (ie the juggler) :

(-10,-4,5.5) obs pos
[-10,20] alt az
35 focal


<.9,.9,.9> 2 (-0.9,-2.1,5.3):0.6; one sphere: <color> type (pos):size;
<.9,.9,.9> 2 (-1.1,1.9,5.9):0.6;
<.9,.9,.9> 2 (-0.4,-1.2,6.8):0.6;
<1,.7,.7> 1 (0,0,6.1):0.5;
<.2,.1,.1> 1 (0.02,0,6.12):0.5;
<.1,.1,1.> 1 (-0.4,0.2,6.1):0.15;
<.1,.1,1.> 1 (-0.4,-0.2,6.1):0.15;
<1,.7,.7> 1 (0,0,5.5):0.2;
<1,.1,.1> 1 (0,0,4.6):0.8 5 (0,0,3.3):0.6;
<1,.7,.7> 1 (0,0.6,2.9):0.2
6 (-0.6,0.6,1.6):0.2 add 6 spheres from previous to this sphere: (pos):size (make a gradient on size & pos)
7 (-0.4,0.6,0):0.1;
<1,.7,.7> 1 (0,-0.6,2.9):0.2 6 (0.2,-0.6,1.6):0.2
7 (0.4,-0.6,0):0.1;
<1,.7,.7> 1 (0,-0.7,5.1):0.2 6 (-0.2,-1.2,4.2):0.2
7 (-1.1,-2.0,4.1):0.1;
<1,.7,.7> 1 (0,0.7,5.1):0.2 6 (-0.2,1.2,4.2):0.2
7 (-1.0,1.9,4.8):0.1;;

1 lamp count
(-100,50,150):15 <1,1,1> lamp (pos):size <color>

<1.5,1.5,0> <0,1.5,0> <.25,.25,.25> <.1,.1,1> <.7,.7,1>
horizon[0].color horizon[1].color illum skyhor skyzen

[thellier]

Sorry I wasnt able to fix the bug in my RT build (the mirror spheres are still not good. Seeems to come from mirror or dot function) I give up
I am not even sure if I introduced a bug or if it was already here in this early RT version
Certainly fixing the bug will need to rewrite the code to make it more "human readable" but this will alterate much the "original" sources ... also I dont want to spend days on this prog...

So here it is the build I did

http://thellier.free.fr/rt-gcc.zip

Alain

[dottyflowers]

Hi guys, you might also want to have a look at chapter 4, pages 88 to 96 from Jimmy Maher's 'The Future was here'. He did a whole chapter on the ssg ("spherical solid geometry" is Mr. Graham's own educated guess) tool after mailing back and forth with Eric Graham and reading a lot of articles. Ernie's page is good, but these pages are recommended reading aswell!

[emufan]

Originally Posted by thellier

...

So here it is the build I did

http://thellier.free.fr/rt-gcc.zip

Alain

thanks for your work, much appreciated
rt does work, just had to read your readme , about the commandline. it does work different to ssg - i guess the latter needs more options for the commandline.
so we still have something to investigate

Originally Posted by dottyflowers

Jimmy Maher's 'The Future was here'.

this indeed sounds very interesting - didnt knew about that special chapter. thanks for info

[emufan]

Ernie Wright has updated his Juggler page: RT1.0 has been found.
he added a new page about the rediscovery of the missing disk