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Ok, last one of these that I post. MPEG-1 really does a large square
pixelating number on this one, much worse than it did on the others. I've
been encoding these both in WMV9 and MPEG, and for the same bit-rate and
almost same file size, WMV9 is extremely smooth next to MPEG. Too bad it's
not a standard format.
Post a reply to this message
Attachments:
Download 'nm4.m1v.mpg' (514 KB)
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From: Greg M Johnson
Subject: Re: More marble bowling, 49 marbles (MPG, 513 KB)
Date: 28 Dec 2003 16:55:33
Message: <3fef5155$1@news.povray.org>
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Extremely cool. Is the rightmost column vibrating from the impact of other
marbles on the floor??
"Alain" <noe### [at] on ca> wrote in message
news:Xns### [at] 204213191226...
> Ok, last one of these that I post. MPEG-1 really does a large square
> pixelating number on this one, much worse than it did on the others. I've
> been encoding these both in WMV9 and MPEG, and for the same bit-rate and
> almost same file size, WMV9 is extremely smooth next to MPEG. Too bad
it's
> not a standard format.
>
>
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"Greg M. Johnson" <gregj;-)565### [at] aolcom> wrote in
news:3fef5155$1@news.povray.org:
> Extremely cool. Is the rightmost column vibrating from the impact of
> other marbles on the floor??
Thanks.
That's funny. Yeah, I'm not sure, probably my code, but perhaps the
jittering of the area light & photons & tracing is playing a part. And
it's strange but it seems that MPEG is amplifying the effect as well. A
blemish indeed.
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On 28 Dec 2003 13:14:17 -0500, Alain <noe### [at] onca> wrote:
>Ok, last one of these that I post. MPEG-1 really does a large square
>pixelating number on this one, much worse than it did on the others. I've
>been encoding these both in WMV9 and MPEG, and for the same bit-rate and
>almost same file size, WMV9 is extremely smooth next to MPEG. Too bad it's
>not a standard format.
Very nice anim though.
One thing I did notice, after blowing it up to full screen:
Some of the columns of marbles appear to vibrate: they seem to go up and
down slightly, even before anything hits them.
--
Marc van den Dikkenberg
--
The PowerBasic Archives -- http://www.xlsior.org
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From: Andrew Wilcox
Subject: Re: More marble bowling, 49 marbles (MPG, 513 KB)
Date: 2 Jan 2004 11:48:22
Message: <3ff5a0d6@news.povray.org>
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> Some of the columns of marbles appear to vibrate: they seem to go up and
> down slightly, even before anything hits them.
It's probably because the step size is too big, and this particular
non-common setup of the spheres. All the spheres in the column fall in
gravity in one step, but do not interact to correct the fall until the next
step. So they fall, correct, fall, correct, thus vibrate. Plus the problem
is probably magnified since we have several spheres stacked one on top of
the other all adding to the end result.
Post a reply to this message
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"Andrew Wilcox" <awi### [at] unpuzzledcom> wrote in
news:3ff5a0d6@news.povray.org:
>> Some of the columns of marbles appear to vibrate: they seem to go up
>> and down slightly, even before anything hits them.
>
> It's probably because the step size is too big, and this particular
> non-common setup of the spheres. All the spheres in the column fall
> in gravity in one step, but do not interact to correct the fall until
> the next step. So they fall, correct, fall, correct, thus vibrate.
> Plus the problem is probably magnified since we have several spheres
> stacked one on top of the other all adding to the end result.
Quite right Andrew. The sim. step size I used was not much higher than the
frame step. If I recall correctly, frames were 120 per second, sim steps
were 1/200 seconds apart. I should have at least doubled the sim steps.
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From: ACH Postma
Subject: Re: More marble bowling, 49 marbles (MPG, 513 KB)
Date: 14 Jan 2004 16:19:05
Message: <4005b249$1@news.povray.org>
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Still one hell of an anim and you make me wanna go dive right into POV-ray
again (unfortunately I have more important things at hand for the comming
month)
/~\nne
"Alain" <noe### [at] onca> wrote in message
news:Xns### [at] 204213191226...
> "Andrew Wilcox" <awi### [at] unpuzzledcom> wrote in
> news:3ff5a0d6@news.povray.org:
>
> >> Some of the columns of marbles appear to vibrate: they seem to go up
> >> and down slightly, even before anything hits them.
> >
> > It's probably because the step size is too big, and this particular
> > non-common setup of the spheres. All the spheres in the column fall
> > in gravity in one step, but do not interact to correct the fall until
> > the next step. So they fall, correct, fall, correct, thus vibrate.
> > Plus the problem is probably magnified since we have several spheres
> > stacked one on top of the other all adding to the end result.
>
> Quite right Andrew. The sim. step size I used was not much higher than
the
> frame step. If I recall correctly, frames were 120 per second, sim steps
> were 1/200 seconds apart. I should have at least doubled the sim steps.
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"ACH Postma" <ann### [at] achpostmanl> wrote in
news:4005b249$1@news.povray.org:
> Still one hell of an anim and you make me wanna go dive right into
Thanks for the compliment!
> POV-ray again (unfortunately I have more important things at hand for
> the comming month)
Yup, so much to do, so little time... plus we have to work! Sucks.
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