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From: Greg M Johnson
Subject: Ever worry about it all crashing down?
Date: 12 Nov 2001 22:41:04
Message: <3bf09650@news.povray.org>
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I once tried to make scaffolding for a WTC-sized tower out of cylinders,
easily more than 20,000 of them. The result was essentially an
unworkable file, as it only rendered slowly and with much disk-swapping
on my 384MB RAM, 1GHz Athlon.
Have you ever been afraid to try something for fear you're only going to
lock up your system or exceed the abilities of the software? I have
been playing around with dozens of several-hundred- component blobs.
Sometimes when something goes wrong, it only turns out to be a bug in my
code, but I fear my ship is about to just fall of the edge of the
pov-earth. Using Corel products (Draw and Dream3D), this actually
happened, and I stopped playing with these toys. Povray, so far, has
largely exceeded my ability to wreck it.
I suppose if I were more computer literate, I'd have a more rational
response to the whole thing. I only comprehend the workings of P-FETs
& the povray SDL, and very little inbetween.
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"Greg M. Johnson" wrote:
>
> Have you ever been afraid to try something for fear you're only going to
> lock up your system or exceed the abilities of the software?
Computers and software are just tools. Switching power off and on
cures any lock up.
_____________
Kari Kivisalo
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From: Greg M Johnson
Subject: Re: Ever worry about it all crashing down?
Date: 13 Nov 2001 08:35:26
Message: <3BF1210F.D5449A80@aol.com>
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Kari Kivisalo wrote:
> Computers and software are just tools. Switching power off and on
> cures any lock up.
No, I don't mean crash. The question is whether you've been unable to do
something because it exceeded the capabilities of the system (such as say
100,000 cylinders), and if fear prevents you from trying some ambitious
projects.
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"Greg M. Johnson" wrote:
>
> Kari Kivisalo wrote:
>
> > Computers and software are just tools. Switching power off and on
> > cures any lock up.
>
> No, I don't mean crash. The question is whether you've been unable to do
> something because it exceeded the capabilities of the system (such as say
> 100,000 cylinders), and if fear prevents you from trying some ambitious
> projects.
On a 'classical' 800x600 image, there is only 480 000 pixels.
With 100 000 cylinders, that give about 4.8 pixels per cylinders.
I do not even bother to render, it cannot be interesting (no details).
Note: I once go very far with a set of Tree mesh, so far in fact that
my whole set of swap partitions (about 1 giga at that time) was fully
used (as well as the 256 Mo of memory, not running the hungry X11 (50Mo),
so with very little memory foot print for the system [linux]).
Parsing time was very slow, povray was happy, the system just hits the limit,
and stopped that silly parsing & rendering. (Or may be stopped as well, I do
not remember).
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: On a 'classical' 800x600 image, there is only 480 000 pixels.
: With 100 000 cylinders, that give about 4.8 pixels per cylinders.
: I do not even bother to render, it cannot be interesting (no details).
You forget that cylinders can be semi-transparent and show other cylinders
behind them.
--
#macro N(D,I)#if(I<6)cylinder{M()#local D[I]=div(D[I],104);M().5,2pigment{
rgb M()}}N(D,(D[I]>99?I:I+1))#end#end#macro M()<mod(D[I],13)-6,mod(div(D[I
],13),8)-3,10>#end blob{N(array[6]{11117333955,
7382340,3358,3900569407,970,4254934330},0)}// - Warp -
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From: Greg M Johnson
Subject: Re: Ever worry about it all crashing down?
Date: 13 Nov 2001 12:12:37
Message: <3BF1542D.FAD230F5@aol.com>
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> On a 'classical' 800x600 image, there is only 480 000 pixels.
> With 100 000 cylinders, that give about 4.8 pixels per cylinders.
> I do not even bother to render, it cannot be interesting (no details).
You forgot animations, where the scaffolding could be a part of the story.
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In article <3bf09650@news.povray.org>, "Greg M. Johnson" <"gregj;-
)56590\""@aol.c;-)om> says...
> I once tried to make scaffolding for a WTC-sized tower out of cylinders,
> easily more than 20,000 of them. The result was essentially an
> unworkable file, as it only rendered slowly and with much disk-swapping
> on my 384MB RAM, 1GHz Athlon.
Only 20k cylinders fill up 386MB?
Last year I made a christmas-tree, with IIRC a bit below 50k cylinders.
It rendered fine with MegaPov .6 and needed almost exactly 256 MB RAM.
Perhaps you had a complex texture assigned to each individual object?
Lutz-Peter
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On Tue, 13 Nov 2001 19:31:22 +0100, Lutz-Peter Hooge <lpv### [at] gmx de> wrote:
> Only 20k cylinders fill up 386MB?
> Last year I made a christmas-tree, with IIRC a bit below 50k cylinders.
> It rendered fine with MegaPov .6 and needed almost exactly 256 MB RAM.
I just rendered this scene
#declare Test=union{
#local C=0;
#while(C<40000)
cylinder{0,1,2}
#if(mod(C,100)=0)#debug concat(str(C,0,0),"\n")#end
#local C=C+1;
#end
pigment{color rgb 1}
}
and it returns "Peak memory used: 18142448 bytes"
but of course it not play with light buffer and other things
ABX
--
#declare _=function(a,b,x){((a^2)+(b^2))^.5-x}#default {pigment{color rgb 1}}
union{plane{y,-3}plane{-x,-3}finish{reflection 1 ambient 0}}isosurface{ //ABX
function{_(x-2,y,1)|_((x+y)*.7,z,.1)|_((x+y+2)*.7,z,.1)|_(x/2+y*.8+1.5,z,.1)}
contained_by{box{<0,-3,-.1>,<3,0,.1>}}translate z*15finish{ambient 1}}//POV35
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news: 3bf09650@news.povray.org...
> Have you ever been afraid to try something for fear you're only going to
> lock up your system or exceed the abilities of the software?
For this picture,
http://www.oyonale.com/ldc/english/chasm.htm
I was happily working on it until the computer started complaining due to
the combination of high-quality radiosity, isosurfaces, large image maps and
very large models. So I bought 512 Mb of RAM to be able to complete it
(remember that Norbert Kern bought a new computer to finish his IRTC winner
"Insects" picture).
Of course now that I'm used to 640Mb some projects can't get done at all so
I won't even start them (rad + iso + ior + focal blur + etc.).
G.
--
**********************
http://www.oyonale.com
**********************
- Graphic experiments
- POV-Ray and Poser computer images
- Posters
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In article <16q2vts7h3eudo20jt542k3f2qmom1ns7u@4ax.com>, abx### [at] babilonorg
says...
> and it returns "Peak memory used: 18142448 bytes"
> but of course it not play with light buffer and other things
I don't know exactly what parts of the scene needed the memory, but I
know it swapped heavily with 128MB. Probably the lightbuffers ate a lot
of RAM, there were lots of lightsources.
Lutz-Peter
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