In article <3b3dec65@news.povray.org>, JRG says...
> I modelled and animated this metronome yesterday afternoon, just because I
> got bored of studying oscillations. I'm completely new in animation (I read
> the documentation just yesterday, after modelling the metronome...) so don't
> mind if you find this one (which is meant to be a cyclic animation of
> course) a bit too simple. I have many question too:
> - Yesterdy I downloaded bmp2avi and cmpeg: how can I create an mpeg
> animation with frames bigger than 512x320? This seems to be impossible.
> Cmpeg looks quite hard to use to me, where can I find a simple
> non-compressed-avi2mpeg convertion program?
> - What is exactly mpeg2?
> - I think motion blur in MegaPov is a bit wrong: IMHO it should "average"
> the frames between t-dt and t. Now it seems to average all frames between
> t-dt/2 and t+dt/2 so that things look like they're vibrating rather than
> moving. This way motion blur objects anticipate their motion and this looks
> quite wrong to me.
> -Which are the differences between AVI and MPEG?
> 
> Please, feedback is really appreciated because I've just discovered POV-Ray
> animation capabilities and really look forward to making something serious
> with them.
> JRG.
The animation is one of the few I have seen the last couple of weeks 
that runs perfectly in Windows mediaplayer: good cycling (IYKWIM). It 
makes a very natural impression as a whole.

My Windows frontend for CMPEG can be of help, but only for images of 
sizes 512x320 and smaller :( You'll find it at http://stols.net . It 
uses uncompressed TGA's only.

Your other questions can best be answered by many people here who are 
much more knowledgeable than I am...
-- 
Regards,  Sander

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I downloaded your front-end as well, but when I try to make the image masks
I always got "filinames not type 8.3" which is not true. I tried everything.
And Cmpeg seems to not read my TGA files (which I obtained with +ft).
jrg.
"Sander" <san### [at] stolscom> ha scritto nel messaggio
news:MPG### [at] NEWSPOVRAYORG...
> In article <3b3dec65@news.povray.org>, JRG says...
> > I modelled and animated this metronome yesterday afternoon, just because
I
> > got bored of studying oscillations. I'm completely new in animation (I
read
> > the documentation just yesterday, after modelling the metronome...) so
don't
> > mind if you find this one (which is meant to be a cyclic animation of
> > course) a bit too simple. I have many question too:
> > - Yesterdy I downloaded bmp2avi and cmpeg: how can I create an mpeg
> > animation with frames bigger than 512x320? This seems to be impossible.
> > Cmpeg looks quite hard to use to me, where can I find a simple
> > non-compressed-avi2mpeg convertion program?
> > - What is exactly mpeg2?
> > - I think motion blur in MegaPov is a bit wrong: IMHO it should
"average"
> > the frames between t-dt and t. Now it seems to average all frames
between
> > t-dt/2 and t+dt/2 so that things look like they're vibrating rather than
> > moving. This way motion blur objects anticipate their motion and this
looks
> > quite wrong to me.
> > -Which are the differences between AVI and MPEG?
> >
> > Please, feedback is really appreciated because I've just discovered
POV-Ray
> > animation capabilities and really look forward to making something
serious
> > with them.
> > JRG.
> The animation is one of the few I have seen the last couple of weeks
> that runs perfectly in Windows mediaplayer: good cycling (IYKWIM). It
> makes a very natural impression as a whole.
>
> My Windows frontend for CMPEG can be of help, but only for images of
> sizes 512x320 and smaller :( You'll find it at http://stols.net . It
> uses uncompressed TGA's only.
>
> Your other questions can best be answered by many people here who are
> much more knowledgeable than I am...
> --
> Regards,  Sander

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"Sander" <san### [at] stolscom> wrote in message
news:MPG### [at] NEWSPOVRAYORG...
> In article <3b3dec65@news.povray.org>, JRG says...
> > I modelled and animated this metronome yesterday afternoon, just because
I
> > got bored of studying oscillations. I'm completely new in animation (I
read
> > the documentation just yesterday, after modelling the metronome...)

Good going then.

> > Cmpeg looks quite hard to use to me, where can I find a simple
> > non-compressed-avi2mpeg convertion program?
>
> Your other questions can best be answered by many people here who are
> much more knowledgeable than I am...

That wouldn't be me but I'll suggest TMPGEnc anyway if you want to explore
mpeg further: http://www.tmpgenc.com/

The motion blur workings are known to be the way you describe.  There were
times when I got very odd results but I won't go into that.  Much of it is
in how you expect something versus the actual outcome though.  It won't even
be in POV-Ray v3.5, not that I recollect the reasons why exactly.
If the clock-induced variable can be coaxed into hovering at a spot then
released it should do the "correct" motion blurring.
Search povray.unofficial.patches back to March 10-12, 2001.  There's the
same thing mentioned there.
A possibility might be to use the following, exchanging objects of course:

#declare C=clock;  // motion blur will accept this (just to set variable)

motion_blur {

  union {

    cone {0,1,-2*y,0}
    sphere { 0, 1}
    torus {.5,.25 clipped_by {cylinder {-.25*y,.25*y,.5}} translate 1.125*y}
    texture {pigment {radial frequency 8} finish{specular .75 metallic 1
brilliance 1}}
  }
  translate 2*y // position toy top
 translate pow(C/BlurS-1,2)*x // the important part
 #declare C=C+1; // C defined outside first, so loop effect takes place
}

I dredged this back up out of a test scene file I had.  Going to post it to
povray.unofficial.patches since it might be something for others to look
over, ugly as it may be.

Bob H.

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In article <3b3ed44c@news.povray.org>, JRG says...
> I downloaded your front-end as well, but when I try to make the image masks
> I always got "filinames not type 8.3" which is not true. I tried everything.
> And Cmpeg seems to not read my TGA files (which I obtained with +ft).
> jrg.
> "Sander" <san### [at] stolscom> ha scritto nel messaggio
> news:MPG### [at] NEWSPOVRAYORG...

JRG:
What OS do you use?
Do you have version 6.4.5.250 of the frontend?
If so, could you post one TGA and give me the exact and complete path?
I could try to locate the problem...

You know: it *should* do the job, and bugs are there to be removed :)
-- 
Regards,  Sander

Post a reply to this message

In article <3b3ed44c@news.povray.org>, JRG says...
> I downloaded your front-end as well, but when I try to make the image masks
> I always got "filinames not type 8.3" which is not true. I tried everything.
> And Cmpeg seems to not read my TGA files (which I obtained with +ft).
> jrg.
Forgot to mention that CMPEG accepts 8.3 directory names only, too, not 
just short file names!
-- 
Regards,  Sander

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perfectly cyclic in media player, and I think your right about the motion
blur.

my first anim was a few rotating chrome spheres (and checker plane) so this
is frightening!


--
Rick

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I'm working with Windows Me, but now Cmpeg seems to work fine (manually).
Thank you anyway.
And yes my files are in directories with quite long names...
Jonathan

"Sander" <san### [at] stolscom> ha scritto nel messaggio
news:MPG### [at] NEWSPOVRAYORG...
> In article <3b3ed44c@news.povray.org>, JRG says...
> > I downloaded your front-end as well, but when I try to make the image
masks
> > I always got "filinames not type 8.3" which is not true. I tried
everything.
> > And Cmpeg seems to not read my TGA files (which I obtained with +ft).
> > jrg.
> > "Sander" <san### [at] stolscom> ha scritto nel messaggio
> > news:MPG### [at] NEWSPOVRAYORG...
>
> JRG:
> What OS do you use?
> Do you have version 6.4.5.250 of the frontend?
> If so, could you post one TGA and give me the exact and complete path?
> I could try to locate the problem...
>
> You know: it *should* do the job, and bugs are there to be removed :)
> --
> Regards,  Sander

Post a reply to this message

JRG <jrg### [at] hotmailcom> wrote:
: - Yesterdy I downloaded bmp2avi and cmpeg: how can I create an mpeg
: animation with frames bigger than 512x320? This seems to be impossible.

  Not with cmpeg, that's for sure.
  Try searching the net. "avi2mpg" should be a good search keyword.

: - What is exactly mpeg2?

  Version 2 of the mpeg standard. Although its quality is much better than
with MPEG1, it still doesn't seem to compress much better small-sized
aminations, but it's more designed for full-resolution movies. It's used
in the DVD format.

  MPEG4 is much better. It compresses any animation a lot smaller and with
a lot more image quality than MPEG1.
  However, currently only partial implementations of the MPEG4 standard
exist (and the standard itself if still under development). However, even
these implementations are much better than MPEG1. A couple of implementations
are ASF and DivX.

: - I think motion blur in MegaPov is a bit wrong: IMHO it should "average"
: the frames between t-dt and t. Now it seems to average all frames between
: t-dt/2 and t+dt/2 so that things look like they're vibrating rather than
: moving. This way motion blur objects anticipate their motion and this looks
: quite wrong to me.

  You are just probably using it in the wrong way. I have made motion-blurred
animations and it looks just ok.

: -Which are the differences between AVI and MPEG?

  MPEG is just an animation format. AVI is more like a container which can
hold almost any type of animation and sound. AFAIK you can even have an
animation in MPEG1 format inside an AVI, the sound being in MP3 format,
for example.
  MPEG has fixed limits for several things, eg. framerate. AVI has no limits
(others than imposed by the codecs for the specific format inside it).
  Usually the AVI format is used to contain a DivX animation.

-- 
#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 -

Post a reply to this message

"Warp" <war### [at] tagpovrayorg> ha scritto nel messaggio
news:3b46eb10@news.povray.org...
>   You are just probably using it in the wrong way. I have made
motion-blurred
> animations and it looks just ok.

This is also motion blurred. And it's blurred following the armonic motion
of the pendulum. Yet MegaPov motion blur is not correct for what I mentioned
in my previous message. Simply because I can't avoid that MegaPov renders
those frames between t and t+dt/2 which I'm not supposed to see when the
actual time coordinate is t.

jrg.

Post a reply to this message

JRG <jrg### [at] hotmailcom> wrote:
: This is also motion blurred. And it's blurred following the armonic motion
: of the pendulum. Yet MegaPov motion blur is not correct for what I mentioned
: in my previous message. Simply because I can't avoid that MegaPov renders
: those frames between t and t+dt/2 which I'm not supposed to see when the
: actual time coordinate is t.

  As said, you are just using the motion blur in the wrong way (ie. giving
it the wrong parameters).

  Reduce your scene to an extremely simple form (ie. just the camera, and
a moving cylinder representing the pendulum) and post it. We can then look
what you are doing wrong (or alternatively spot a bug in MegaPov, although
I doubt it).

-- 
#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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