TITLE: Erathostenes sieve
NAME: Ondrej Svoboda
COUNTRY: Czech Republic
EMAIL: osvo@aristia.cz
WEBPAGE: http://www.geocities.com/Paris/LeftBank/5572
TOPIC: Physics & Math
COPYRIGHT: I SUBMIT TO THE STANDARD RAYTRACING COMPETITION COPYRIGHT.
JPGFILE: oserath.jpg
ZIPFILE: oserath.zip
RENDERER USED: 
    POV-RAY 3.01 for Win95

TOOLS USED: 
    Win95 TT font Copperplate Gothic Bold, Graphic Workshop version 1.1x
for JPEG conversion

RENDER TIME: 
    18h50min02sec

HARDWARE USED: 
    IBM PC 330, Pentium 166, 32MB RAM

IMAGE DESCRIPTION: 

My picture is visualisation of Erathostenes sieve. It is a algorithm for
calculating of prime numbers.

DESCRIPTION OF HOW THIS IMAGE WAS CREATED: 

First i have created both planes. Then i have declared all boxes and balls. I
have after them built 
the sieve and placed balls. Last time i added the stone bar with numbers. At the
start  i have declared 
the sieve as a union of boxes, later was union replaced with merge keyword. The
render time is with 
this operation dramaticaly larger (from 30 min to 19h). I thought that the merge
should take out all internal 
bounds, but (you can see it) i am not sure that POV-Ray interpret the adjacent
areas right. I can be wrong, 
it is my first attempt to participiate in IRTC and i work with this software
only 1 month.

P.S. Sorry if the term sieve is not right for the description of this
Erathostens algorithm, i have very 
small dictionary and my English is not good.

